A policeman investigating an accident measures the skid marks left by a car on the horizontal road. He determines that the distance was 23.74 n. The coefficient of kinetic friction between the tires and the road is μk = 0.29 How fast was the car going when the driver applied the brakes

The Potential energy stored in the system is 1 J

Explanation:

Given-

Mass, m = 4 kg

Spring constant, k = 800 N/m

Distance, x = 5cm = 0.05m

Potential energy, U = ?

We know,

Change in potential energy is equal to the work done.

So,

[tex]U = \frac{1}{2} k (x)^2\\\\[/tex]

By plugging in the values we get,

[tex]U = \frac{1}{2} * 800 * (0.05)^2\\ \\U = 400 * 0.0025\\\\U = 1J\\[/tex]

Therefore, Potential energy stored in the system is 1 J

Answer:

The stickiness in the inner walls allows them to be easily coated with the desired antigens, this translates in the use of a smaller amount of antigen. If the walls weren't sticky there's a possibility the antigen won't stick to them and therefore the result of the ELISA can be a false negative.

I hope you find this information useful and interesting! Good luck!

Answer:

The charges on the spring are 1.23E-5 C and they have the same sign

Explanation:

Given

Coulomb laws states that the force exerted by a charge q on another charge Q at a distance r is given by

F = kqQ/r²

Where k = 8.99 * 10^9 Nm²/C²

r = 0.43 + 0.013

r = 0.443m

The force on the spring is calculated as;.

F = kx where x is the stretch length of the spring and k is the spring constant

The force acting on the spring = 238 * 0.013

F = 3.094N

By comparison;

F = kqQ/r² becomes

3.094 = F = kqQ/r²

kqQ/r² = 3.094 (Considering that a = Q)

kq²/r² = 3.094

8.99 * 10^9 * q²/0.443 = 3.094 -- make q² the subject of formula

q² = 3.094 * 0.443/8.99*10^9

q² = 1.524629588431E−10

q = √1.524629588431E−10

q = 0.000012347589191545C

q = 1.23E-5 C

The charges on the spring are 1.23E-5 C and they have the same sign

Answer:

160N/m

Explanation:

According to Hooke's law which states that the extension of an elastic material is directly proportional to the applied force provided that the elastic limit is not exceeded. Mathematically,

F = ke where

F is the applied force

k is the spring constant

e is the extension

From the formula k = F/e

Since the body accelerates when the block is released, F = ma according to Newton's second law of motion.

The spring constant k = ma/e where

m is the mass of the block = 0.4kg

a is the acceleration = 8.0m/s²

e is the extension of the spring = 2.0cm = 0.02m

K = 0.4×8/0.02

K = 3.2/0.02

K = 160N/m

The spring constant of the spring is therefore 160N/m

Final answer:

The spring constant of the spring is calculated using Hooke's Law and Newton's second law of motion. By multiplying the mass of the block by its acceleration, we found the force, and then divided the force by the displacement to get the spring constant, which is 160 N/m.

Explanation:

To determine the spring constant of the spring, we need to apply Hooke's Law, which states that the force exerted by an ideal spring is directly proportional to its displacement from the equilibrium position (F = -kx), where 'F' is the force, 'k' is the spring constant, and 'x' is the displacement. Since the block is on a frictionless surface and we know the acceleration (a = 8.0 m/s2) and the mass (m = 0.40 kg), we can first find the force using Newton's second law (F = ma), and then use that force to calculate the spring constant 'k'.

The force exerted by the spring can be calculated as:

F = m * a
= 0.40 kg * 8.0 m/s²
= 3.2 N

The displacement (x) from the equilibrium position is given as 2.0 cm, which is 0.020 m in SI units. Using Hooke's Law, the spring constant can be calculated:

k = F / x
= 3.2 N / 0.020 m
= 160 N/m

Answer:

0.247 J = 247 mJ

Explanation:

From the principle of conservation of energy, the workdone by the applied force, W = kinetic energy change + electric potential energy change.

So, W = ΔK + ΔU =1/2m(v₂² - v₁²) + q(V₂ - V₁) where m = mass of particle = 5.4 × 10⁻² kg, q = charge of particle = 5.10 × 10⁻⁵ C, v₁ = initial speed of particle = 2.00 m/s, v₂ = final speed of particle = 3.00 m/s, V₁ = potential at surface A = 5650 V, V₂ = potential at surface B = 7850 V.

So, W = ΔK + ΔU =1/2m(v₂² - v₁²) + q(V₂ - V₁)

          = 1/2 × 5.4 × 10⁻²kg × ((3m/s)² - (2 m/s)²) + 5.10 × 10⁻⁵ C(7850 - 5650)

          = 0.135 J + 0.11220 J

          = 0.2472 J

          ≅ 0.247 J = 247 mJ

Answer:

[tex]\boxed {3.43 x 10^{3}}[/tex]

Explanation:

We know that speed is defined as distance moved per unit time hence expressed as [tex]v=\frac {d}{t}[/tex] where v is speed in m/s, d is distance in m and t is time in seconds. Making d the subject of the above formula then

[tex]d=vt[/tex]

Substituting 343 m/s for d and 10 s for t then

[tex]d= 343\times10= 3430= 3.43 x 10^{3}[/tex]

Therefore, the distance between speaker and deter is [tex]\boxed {3.43 x 10^{3}}[/tex]

Answer:

The work done on the canister by the 5.0 N force during this time is

54.06 Joules.

Explanation:

Let the initial kinetic energy of the canister be

KE₁ = [tex]\frac{1}{2} mv_1^{2}[/tex] = [tex]\frac{1}{2} *3*3.6^{2}[/tex] = 19.44 J in the x direction

Let the the final kinetic energy of the canister be

KE₂ = [tex]\frac{1}{2} mv_2^{2}[/tex] = [tex]\frac{1}{2} *3*7.0^{2}[/tex] = 73.5 J in the y direction

Therefore from the Newton's first law of motion, the effect of the force is the change of momentum and the difference in energy between the initial and the final

= 73.5 J - 19.44 J = 54.06 J

Explanation:

Below is an attachment containing the solution.

The maximum mass of block B, for which block A remains at rest on a 35-degree incline given a static friction coefficient of 0.40 and a 10kg mass of block A, is approximately 1.98 kg.

To solve this question, we will need to use the principles of static friction, inclined planes, and gravitational force. Static friction is what keeps block A from sliding down the incline. It has to overcome the downward force due to gravity on block A which is a component of the weight of block A acting downwards the inclined plane.

To determine the maximum mass of block B, we can equate the static frictional force to the net force acting downward on the inclined plane. The static frictional force is [tex]\mu N[/tex] where μ is the coefficient of static friction and N is the normal force. N = [tex]mAgcos\theta[/tex] where mA and g are the mass and acceleration due to gravity respectively and θ is the angle of the inclined plane. So, static frictional force = [tex]\mu mAgcos\theta[/tex]. The downward force is the sum of components of the weight of block A acting downwards and the weight of block B. So, [tex]mAgcos\theta (\mu)[/tex] = mAg*[tex]sin\theta[/tex] + mBg.

From this equation, you can solve for the mass of Block B: MB = [tex]mA\mu cos\theta[/tex] - mA*[tex]sin\theta[/tex].

Plugging in the given numbers, we get:

MB = 10(0.4*cos(35 degrees) - sin(35 degrees)).

This gives us approximately 1.98 kg as the maximum mass of block B before block A begins to slide.

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To find the largest mass for block MB, we first need to calculate the gravitational force and the static friction on block A, using the given values for mass, gravitational acceleration, coefficient of static friction and incline angle. The tension in the string, created by block MB, has to balance these forces. By setting the net forces equal, we can calculate the value of MB.

The problem revolves around understanding the concept of static friction and forces acting on an inclined plane. Firstly, let's calculate the force due to gravity acting on block A. This is simply F_gravity = mg sin θ where m=10 kg is the mass of the block, g=9.8 m/s² is the gravitational acceleration, and θ is 35°. Next, we need to calculate the frictional force that prevents the block from sliding. Since block A is at rest, static friction is at work here, and we can use the formula F_friction = μN, where μ=0.40 (the coefficient of static friction) and N is the normal force acting on the block, which equals mg cos θ.

To keep block A at rest, the tension T in the string due to the dangling mass MB must balance both gravity and friction. Therefore: T=F_gravity + F_friction. The weight of the dangling mass brings about the tension in the string, and hence, T=MBg. From these, we can calculate the largest mass of MB for which A remains at rest.

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Answer:

The answer to the question is

A tilted bed is said to have a _dip____, describing the angle that the bed forms with the horizontal plane--and a strike, the compass direction that lies at right angles to the tilted bed.

Explanation:

The dip of a tilted bed, describes the acute angle a tilted bed makes with the horizontal plane, by stating the numerical value of the angle from 0 to 90 degrees  as well as pointing out the orientation of the downward dipping direction in the orientation towards N, S, E, W

The strike line represents the line formed to represent the intersection of a feature of a bed  such as the bed rock surface with a horizontal plane.

The dip and the strike line of a tilted bed are always at right angles to each other on a geologic map.

A tilted geological layer's angle with the horizontal is called the 'dip' and the line it forms intersecting with the horizontal at 90 degrees is the 'strike'. These measurements help determine the orientation of rock layers suffering from deformation.

A tilted bed is said to have a dip, describing the angle that the bed forms with the horizontal plane—and a strike, the compass direction that lies at right angles to the tilted bed. The dip is a measure of the steepest angle of descent relative to the horizontal plane and indicates the direction in which water would flow down the plane. The strike, on the other hand, is the direction of the line formed by the intersection of a rock layer's surface with the horizontal plane, which is always perpendicular to the dip direction. Survey instruments like a Brunton Compass are commonly used by geologists to measure strike and dip accurately to understand feature orientations within geological formations.

Answer:

26 L

Explanation:

According to the first law of thermodynamics, for an ideal gas:

[tex]\Delta U=Q-W[/tex]

where

[tex]\Delta U[/tex] is the change in internal energy of the gas

Q is the heat absorbed by the gas

W is the work done by the gas

The internal energy of a gas depends only on its temperature. Here the temperature of the gas is kept constant (330 K), so the internal energy does not change, therefore

[tex]\Delta U=0[/tex]

So we have

[tex]Q=W[/tex]

The heat added to the gas is

[tex]Q=1.7 kJ = 1700 J[/tex]

So this is also equal to the work done by the gas:

[tex]W=1700 J[/tex]

For a process at constant temperature, the work done by the gas is given by

[tex]W=nRT ln\frac{V_2}{V_1}[/tex]

where:

n is the number of moles

R is the gas constant

T is the temperature of the gas

[tex]V_1[/tex] is the initial volume

[tex]V_2[/tex] is the final volume

In this problem, we have:

W = 1700 J is the work done by the gas

n = 2.00 mol

T = 300 K is the gas temperature

[tex]V_1=19 L[/tex] is the initial volume of the gas

And solving the equation for V2, we find the final volume of the gas:

[tex]V_2=V_1 e^{\frac{W}{nRT}}=(19)e^{\frac{1700}{(2.0)(8.314)(330)}}=26 L[/tex]

Final answer:

The buoyant force experienced by an object submerged in a fluid is determined by the Archimedes' principle. When floating in the denser water of the Dead Sea, the buoyant force is greater than one's weight.

Explanation:

The buoyant force experienced by an object submerged in a fluid is determined by the Archimedes' principle, which states that the buoyant force is equal to the weight of the fluid displaced by the object. When a person floats in fresh water, the buoyant force acting on them is equal to their weight. However, when they float higher in the denser water of the Dead Sea, the buoyant force that acts on them is greater than their weight. Therefore, the correct answer is (a) greater than their weight.

Final answer:

The buoyant force acting on you when you float in the denser water of the Dead Sea is equal to your weight, which is consistent with Archimedes' principle. The correct option is c.

Explanation:

When you float higher in the denser water of the Dead Sea, the buoyant force that acts on you is: c) equal to your weight. Archimedes' principle tells us that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid that the object displaces. Given that the Dead Sea has a higher density due to its salt content, you displace less water to experience a buoyant force that equals your weight, compared to fresh water. As a result, you float higher in the Dead Sea, but the buoyant force itself remains equal to your weight. Hence, Option c is correct.

Answer:

Option B, it is strongly attracted

Explanation:

A Test Charge Determines Charge on Insulating and Conducting Balls, and the points made regarding conductors, it can be ascertained that in conductors, the electrons are free to move about. This means that when a charge is brought near to a conductor, the opposite charges all navigate to the sharpest point closest the charge and a strong attraction is created.

This shows that the rod will be strongly attracted. The density of the charges on the rod is mostly concentrated at the sharpest point.

End A of the rod will be strongly attracted to the negatively charged metal ball because of the process of charge induction, where opposite charges attract.

When the negatively charged metal ball is brought near to end A of the rod, end A of the rod will be strongly attracted to the negatively charged ball. This is because of the principle of charge induction. When a charged body is brought near to another body, it will cause the charges in that body to redistribute. Opposite charges attract, so the near side of the rod (end A) will have a positive charge induced on it, and this positive charge will be attracted to the negative charge on the ball. So, the correct answer is option b. It is strongly attracted.

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Answer:

[tex]2.4\times 10^{12}[/tex]

Explanation:

We are given that

Speed of light,v=[tex]2.998\times 10^8 m/s[/tex]

Diameter of ring,d=92 m

Radius,r=[tex]\frac{d}{2}=\frac{92}{2}=46 m[/tex]

Current, I=0.40 A

We have to find the number of electrons in the beam.

We know that

Current,I=[tex]\frac{q}{t}[/tex]

Where q= ne

[tex]e=1.6\times 10^{-19} C[/tex]

Using the formula

[tex]0.40=\frac{1.6\times 10^{-19}n}{\frac{2\pi r}{v}}[/tex]

[tex]0.40=\frac{1.6\times 10^{-19}n\times v}{2\pi r}[/tex]

[tex]0.40=\frac{1.6\times 10^{-19}n\times 2.998\times 10^8}{2\pi\times 46}[/tex]

[tex]n=\frac{0.40\times 2\pi\times 46}{1.6\times 10^{-19}\times 2.998\times 10^8}=2.4\times 10^{12}[/tex]

Answer:

0.6m/s

Explanation:

Totally inelastic collision

m₁v₁ + m₂v₂ = ( m₁ + m₂)v(final)

Where v (v₁ and v₂) is the initial velocity of the objects

v(final) is the  final velocity of the objects stuck together

Toy car a , m₁ = 3kg, v₁ = 1m/s

Toy car b , m₂ = 2kg, v₂ = 0m/s

m₁v₁ + m₂v₂ = ( m₁ + m₂)v(final)

3(1) + 2(0) = (3 + 2) v(final)

3 = 5 v(final)

v(final) = 0.6m/s

Explanation:

Below is an attachment containing the solution.

Answer:

The greater the masses of two objects, the greater the resultant gravitational force; the greater the distance between the two objects, the smaller the resultant gravitational force.

Explanation:

The gravitational force between two objects is an attractive force, whose magnitude is:

[tex]F=G\frac{m_1 m_2}{r^2}[/tex]

where

G is the gravitational constant

m1, m2 are the masses of the two objects

r is the distance between the objects

From the equation above, we observe that:

- The magnitude of the force is directly proportional to the product of the masses

- The magnitude of the force is inversely proportional to the square of the distance between the masses

Therefore, we can say that:

The greater the masses of two objects, the greater the resultant gravitational force; the greater the distance between the two objects, the smaller the resultant gravitational force.

Final answer:

The gravitational force between two objects increases with the masses and decreases with the distance between them. The correct terms for the blanks are 'stronger' for the effect of mass and 'weaker' for the effect of distance.

Explanation:

The question is related to the concept of gravitational force in physics. We know from Newton's law of universal gravitation that the gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. This can be represented by the formula:

[tex]F_{gravity} = G \frac{ (M_1 M_2)}{R^2}[/tex],

where [tex]F_{gravity}[/tex] is the gravitational force, G is the gravitational constant, [tex]M_1[/tex] and [tex]M_2[/tex] are the masses of the two objects, and R is the distance between the centers of the two objects.

Thus, the sentence correctly filled out would be: The greater the masses of two objects, the stronger the resultant gravitational force; the greater the distance between the two objects, the weaker the resultant gravitational force.

Answer: Pitch

Explanation:

Pitch of sound is defined as the factor that monitors the sound quality through produced vibrations rate.It helps in determination of sounds tone in terms highness or lowness.

According to the question,Enrico is finding difficulty in judging the difference between pitch sound of tuba and piccolo as per their tone in terms of high or low.

Enrico is having trouble telling the difference between the sound of a tuba and the sound of a piccolo. Even though a piccolo produces much briefer, faster sound waves than does a tuba, he has trouble picking out the differences in the pitch of these sounds.

Pitch: Pitch is the perceptual attribute of sound that allows us to distinguish between different frequencies. The sound of a tuba and a piccolo are different primarily because they produce sound waves at different frequencies. A tuba produces lower frequency sound waves (lower pitch), while a piccolo produces higher frequency sound waves (higher pitch). If Enrico is having trouble telling the difference between the sound of a tuba and a piccolo, it suggests he is having trouble distinguishing between their pitches.

Loudness: Loudness refers to the perceived volume or intensity of a sound. While the tuba and piccolo can be played at different volumes, the primary distinguishing factor between them is not loudness but pitch.

Hue: Hue is a term used in the context of color, not sound. It refers to the distinct characteristic of color that allows us to differentiate between colors such as red, blue, and green.

Amplitude: Amplitude refers to the height of the sound wave and is related to the loudness or volume of the sound. While amplitude can affect how loud a sound is, it does not directly differentiate between the characteristic sounds of a tuba and a piccolo.

Therefore, the appropriate term for distinguishing between the sounds of different instruments, such as a tuba and a piccolo, is pitch.

The complete question is:

Enrico is having trouble telling the difference between the sound of a tuba and the sound of a piccolo. Even though a piccolo produces much briefer, faster sound waves than does a tuba, he has trouble picking out the differences in the of these sounds.

O pitch

O loudness

O hue

O amplitude

Final answer:

The horizontal component of the normal force, represented as FNsinθ, provides the centripetal force necessary for a car to round a circular curve on a banked turn without friction.

Explanation:

When a car is rounding a circular curve on a banked turn, the force that provides the centripetal force necessary to keep the car moving on the circular path is the horizontal component of the normal force exerted on it by the road. This can be represented as FNsinθ, where θ is the banking angle. The weight of the car, mg, acts vertically downwards and does not contribute to the centripetal force in this ideal frictionless scenario. For ideal banking, where the angle is perfect for the speed and radius of the turn, the net external force equals the horizontal centripetal force required for circular motion. Therefore, the horizontal component of the normal force is the only force component that acts towards the center of the curvature, providing the centripetal acceleration.

Explanation:

Stars form in the Milky Way at a rate of about 1 solar mass per year, which means it would take a few hundred billion years for all gas to be turned into stars, far exceeding the universe's age of 14 billion years. Pulsars and supernova events influence this star-forming process and the interstellar medium.

Astronomers have estimated that new stars form in our galaxy, the Milky Way, at a rate of about 1 solar mass per year. If we consider the amount of interstellar gas available to form new stars, and no new gas was added, we can calculate how long it would take for all the gas to be converted into stars. Given that the Milky Way contains about a few hundred billion solar masses of gas, it would take a few hundred billion years for all the interstellar gas to be used up at the current rate of star formation, which is significantly longer than the age of the universe (14 billion years).

Stars, including pulsars, form and die within the galaxy at varying rates. For example, one new pulsar is born approximately every 25 to 100 years, aligned with the rate of supernovae occurrences. Supernova explosions contribute to the recycling of interstellar material, affecting star formation and the interstellar medium.

Answer:

3. It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.

Explanation:

Diffusion can be defined as the movement of solute or gaseous molecules from the region in which they have higher concentration to the regions in which they have lower concentration until they become evenly distributed across the two regions.

Diffusion is a passive process, that is, it requires no energy.

Option 3 is the correct option.

Answer:

It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration

Explanation:

Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. It is an important process for living things.

A single substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across a space

Answer:

Main sequence

Giant

Planetary nebula

White dwarf

Black dwarf

Explanation:

Main Sequence:

Stars are called main sequence stars when their core temperature reaches up to 10 million kelvin and their start the nuclear fusion reactions of hydrogen into helium in the core of the star. For example sun is known as to be in the stage of main sequence as the nuclear fusion reactions are happening in its core.

Giant:

Next step is the Giant phase. When the stars run out of their fuel that is hydrogen for the nuclear fusion reactions then they convert into Giant stars. Giant stars have the larger radius and luminosity then the main sequence stars.

Planetary nebula:

Planetary nebula consists of glowing gases and plasma, it ejects from the red giant stars that run out of their fuel.

White dwarf:

When the stars run out of their fuel then they shed the outer layer planetary nebula, the remaining core part that left behind is called as white dwarf. It's the most dense part as the most of the mass is concentrated in this part.

Black dwarf:

When the white dwarf cool down completely that it no longer emitt heat and light then it is called as black dwarf.

These were the possible stages that includes in the evolution of stars

Answer:

(a). The ball's centripetal acceleration is [tex]16.17\times10^{2}\ m/s^2[/tex]

(b). The magnitude of the net force is 232.9 N.

Explanation:

Given that,

Mass of baseball = 144 g

Speed = 81 mph = 36.2 m/s

Distance = 81 cm

(a). We need top calculate the ball's centripetal acceleration just before it is released

Using formula of centripetal acceleration

[tex]a=\dfrac{v^2}{r}[/tex]

Where, v = speed

r  = radius

Put the value into the formula

[tex]a=\dfrac{(36.2)^2}{81\times10^{-2}}[/tex]

[tex]a=1617.82\ m/s^2[/tex]

[tex]a=16.17\times10^{2}\ m/s^2[/tex]

(b). We need to calculate the magnitude of the net force that is acting on the ball just before it is released

Using formula of force

[tex]F=\dfrac{mv^2}{r}[/tex]

Put the value into the formula

[tex]F=\dfrac{144\times10^{-3}\times(36.2)^2}{81\times10^{-2}}[/tex]

[tex]F=232.9\ N[/tex]

Hence, (a). The ball's centripetal acceleration is [tex]16.17\times10^{2}\ m/s^2[/tex]

(b). The magnitude of the net force is 232.9 N.

Explanation:

When a radioactive substance decays then the fast moving electrons emitted by it is known as beta ray. Basically, a number of beta particles are ejected by a beta ray.

Symbol of a beta particle is [tex]^{0}_{-1}e[/tex]. A beta ray is a natural decay of a radioactive element. As we know that opposite charges get attracted towards each other. So, a beta ray gets attracted towards a positively charged plate.

Therefore, we can conclude that following are the characterizes a beta ray:

Final answer:

Beta rays are negatively charged, attracted to the positively charged plate in an electric field, and are composed of electrons. They are a product of natural radioactive decay and are lighter and much less massive than alpha particles.

Explanation:

Beta rays are characterized by specific properties that distinguish them from other types of radiation produced during natural radioactive decay. According to Ernest Rutherford's research, which involved observing the behavior of radiation in magnetic and electric fields, beta particles are known to be negatively charged and relatively light. This means they are attracted to the positively charged plate in an electric field and are significantly deflected due to their lighter mass compared to alpha particles.

Beta rays are not electromagnetic radiation; this term is reserved for gamma rays, which are uncharged and therefore unaffected by electric fields. Beta rays are indeed a product of natural radioactive decay, specifically during a process known as beta decay, in which a nucleus emits an electron or a positron. Since they are composed of high-energy electrons, the identification that beta rays are composed of electrons is also correct.

Answer:

The magnitude of the final velocity is 14.14 m/s

Explanation:

The horizontal component of the final velocity and vertical component of the final velocity, forms a perpendicular vector. To determine the magnitude of the final velocity, we sum the two vectors.

To add two perpendicular vector, Pythagoras principle is used.

[tex]V^2 = V_x^2 +V_y^2\\\\V = \sqrt{V_x^2 +V_y^2}\\\\V = \sqrt{(10)^2 +(-10)^2} =14.14 m/s[/tex]

The magnitude of the final velocity is 14.14 m/s

The total distance travelled by the ball after the fourth impact is 275 feet.

Explanation:

Given-

Height, h = 100 feet

Rebounds half the distance

Distance in feet for the fourth time, x = ?

For the first time, the distance travelled by the ball is, x = 100 feet

For the second time, it will bounce up to 50 feet and fall upto 50 feet( half of 100 feet)

So, the distance travelled after the second impact, x = 100 + 50 + 50 = 200 feet

For the third time, it will bounce up to 25 feet and fall upto 25 feet( half of 50 feet)

So, the distance travelled after the third impact, x = 200 + 25 + 25 = 250 feet

For the fourth time, it will bounce up to 12.5 feet and fall upto 12.5 feet( half of 25 feet)

So, the distance travelled after the fourth impact, x = 250 + 12.5 + 12.5 = 275 feet

Therefore, total distance travelled by the ball after the fourth impact is 275 feet.

Explanation:

The dart is project with 150 m/s from a point at an angle of 30⁰

The vertical component of velocity = 150 sin 30 = 75 m/s

Thus initial vertical velocity is = 75 m/s

The velocity after 4 s can be calculate by

v = u - g t

here u is the initial velocity and t is the time , g is the acceleration due to gravity .

Thus v = 75 - 10 x 4 = 35 m/s

The velocity after 4.0 seconds will be "35 m/s".

According to the question,

Speed,

Angle,

Vertical component of velocity,

After 4 seconds, the velocity will be:

→ [tex]v = u-gt[/tex]

By substituting the values, we get

     [tex]= 75-10\times 4[/tex]

     [tex]= 75-40[/tex]

     [tex]= 35 \ m/s[/tex]

Thus the answer above is right.    

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Answer:

[tex]T_1=0.24y[/tex]

Explanation:

Using Kepler's third law, we can relate the orbital periods of the planets and their average distances from the Sun, as follows:

[tex](\frac{T_1}{T_2})^2=(\frac{D_1}{D_2})^3[/tex]

Where [tex]T_1[/tex] and [tex]T_2[/tex] are the orbital periods of Mercury and Earth respectively. We have [tex]D_1=0.39D_2[/tex] and [tex]T_2=1y[/tex]. Replacing this and solving for

[tex]T_1^2=T_2^2(\frac{D_1}{D_2})^3\\T_1^2=(1y)^2(\frac{0.39D_2}{D_2})^3\\T_1^2=1y^2(0.39)^3\\T_1^2=0.059319y^2\\T_1=0.24y[/tex]

Final answer:

A year on Mercury is approximately 88 Earth days long, which means it is about 0.241 Earth years, due to Mercury's average distance from the Sun being 0.39 times that of Earth's.

Explanation:

The student's question relates to the orbital period of Mercury compared to Earth's, given its average distance from the Sun. Mercury’s orbit around the Sun takes approximately 88 Earth days, which constitutes a Mercury year. This is calculated using Kepler's third law of planetary motion, which relates the orbital period of a planet to its average distance from the Sun (orbital semi-major axis).

Because Mercury is 0.39 times as far from the Sun as Earth is, its orbital period is significantly shorter than Earth's. Earth's average distance from the Sun is approximately 1 astronomical unit (AU), making it the basis for measuring distances in our solar system. Therefore, a year on Mercury, in Earth years, is 88/365, or about 0.241 Earth years.

Answer: non-shifting lines indicate non moving star.

Explanation: when a star is moving toward the detector, the wavelength will decrease - there will be a blue shift.

When it's moving away from the earth or detector, the wavelength will increase - there will be a red shift.

Identifiable patterns of absorption lines that appear shorter or longer wavelengths than normal indicate that the star is moving

In visualisation, the bottom spectrum shows the normal position of absorption line for a star that is not moving toward or away from the earth.

Non-shifting lines in the binary star system's spectrum are attributed to absorption by interstellar clouds, which unlike the stars, do not move relative to us. The narrowness of these lines indicates the low pressure of the absorbing gas.

When observing a binary star system and noting the Doppler Effect in the spectral lines, if certain lines do not shift, it indicates they originate from something that is not moving with respect to us. Most of the absorption lines shift due to the motion of the binary stars, which causes Doppler shifts as the stars move toward or away from us. This movement results in the spectral lines being blue-shifted when the star is approaching us, and red-shifted when it's receding. However, the lines that remain constant are likely due to the absorption by interstellar clouds located between Earth and the stars. The non-shifting lines are also much narrower, suggesting that the absorbing gas is at a very low pressure. This non-movement of specific lines helped in discovering the presence of interstellar materials, as their spectral lines do not participate in the Doppler shifts associated with the stars' orbits.

Answer:

With an initial speed of 10m/s at an angle 30° below the horizontal, and a height of 8m, the projectile travels 7.49m horizontally before it lands.

Explanation:

Since the horizontal motion is independent from the vertical motion, we can consider them separated. The horizonal motion has a constant speed, because there is no external forces in the horizontal axis. On the other hand, the vertical motion actually is affected by the gravitational force, so the projectile will be accelerated down with a magnitude [tex]g[/tex].

If we have the initial velocity [tex]v_o[/tex] and its angle [tex]\theta[/tex], we can obtain the vertical component of the velocity [tex]v_{oy}[/tex] using trigonometry:

[tex]v_{oy}=v_osin\theta[/tex]

Therefore, if we know the height at which the projectile was launched, we can obtain the final velocity using the formula:

[tex]v_{fy}^{2} =v_{oy}^{2}+2gy\\\\ v_{fy}=\sqrt{v_{oy}^{2}+2gy }[/tex]

Next, we compute the time the projectile lasts to reach the ground using the definition of acceleration:

[tex]g=\frac{v_{fy}-v_{oy}}{\Delta t} \\\\\Delta t= \frac{v_{fy}-v_{oy}}{g}=\frac{\sqrt{v_{oy}^{2}+2gy} -v_{oy}}{g}[/tex]

Finally, from the equation of horizontal motion with constant speed, we have that:

[tex]x=v_{ox}\Delta t= v_{ox}\frac{\sqrt{v_{oy}^{2}+2gy} -v_{oy}}{g}[/tex]

For example, if the projectile is launched at an angle 30° below the horizontal with an initial speed of 10m/s and a height 8m, we compute:

[tex]v_{ox}=10\frac{m}{s} cos30=8.66\frac{m}{s}\\v_{oy}=10\frac{m}{s} sin30=5\frac{m}{s}\\\\x=8.66\frac{m}{s} \frac{\sqrt{(5\frac{m}{s}) ^{2}+2(9.8\frac{m}{s^{2}})8m}-5\frac{m}{s} }{9.8\frac{m}{s^{2} } } =7.49m[/tex]

In words, the projectile travels 7.49m horizontally before it lands.

Answer:

a) 5.51m/s² b) 192.94N c) 1.38m each

Explanation:

Given two boxes of masses m1 = 35kg and m2 = 45kg hung vertically from opposite ends of a rope passing over a rigid horizontal metal rod, we will analyze the forces acting on each body.

According Newton's second law, Force = mass ×acceleration

The forces acting on body of mass m1 are the tension (T) and the frictional force (Ff) which opposes the tension.

Taking the sum of horizontal forces acting on mass m1, we will have;

T +(-Ff) = m1a

T - Ff = m1a... (1)

For the mass m2, the forces acting on the body are in the vertical direction and this forces are the weight (W) acting downwards and the tension(T) acting upwards. The sum of the forces in the body is given as ;

W + (-T) = m2a

W-T = m2a ...(2)

Since W = mg, equation 2 will become;

m2g - T = m2a...(2)

Solving equation 1 and 2 simultaneously to get the tension and the acceleration, we have;

T - Ff = m1a ... 1

m2g - T = m2a ... 2

Since friction is negligible, Ff = 0

Adding the two equation will give;

m2g-Ff = m2a+m1a

Since Ff =0

m2g = (m2+m1)a

a = m2g/m1+m2

a = 45(9.8)/45+35

a =441/80

a = 5.51m/s²

b) Substituting a = 5.51 into equation 1 to get the tension T in the rope will give;

T = m1a

T = 35×5.51

T = 192.94N

c) since velocity = displacement/time

Displacement = velocity × time

To get the velocity, since acceleration = velocity/time,

Velocity = acceleration ×time

Velocity = 5.51× 0.5

Velocity = 2.76m/s

Displacement of each box will be the same since they are moving with the same acceleration.

Displacement = 2.76m/s × 0.5s

Displacement of each boxes = 1.38m

The acceleration of the boxes is 0.98 m/s^2, the tension in the rope is 376.3 N, and the displacement of each box after 0.5 seconds is 0.12 m.

This question deals with the physics of motion, particularly involving concepts of mass and friction. Given that the two boxes with different masses m1=35kg and m2=45kg are hung vertically from opposite ends of a rope over a rigid horizontal metal rod, and stating negligible friction, we can compute:  

Learn more about Motion here:

https://brainly.com/question/35591666

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