For two objects with masses 100 kg and 500 kg to be 20 meters apart , find the gravity between them

Scientists' estimate of the world's age has changed significantly over time, thanks to the discovery of radiometric dating techniques. They now estimate the Earth to be around 4.5 billion years old.

Over time, scientists' estimate of the world's age has changed significantly. Initially, scientists believed that the Earth was only a few thousand years old, based on religious and historical texts. However, with the discoveries of radioactivity and the development of radiometric dating techniques, scientists now estimate the age of the Earth to be around 4.5 billion years. This estimate has become increasingly accurate and is supported by various lines of evidence, including the dating of rocks and the Moon's formation.

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Answer:The wave period is the time it takes to complete one cycle. The standard unit of a wave period is in seconds, and it is inversely proportional to the frequency of a wave, which is the number of cycles of waves that occur in one second.

Explanation:

Answer:

v = 640m/s

Explanation:

The velocity of the apple just before it hits the ground is 10 m/s.

The given parameters;

Apply the principle of conservation of mechanical energy to determine the velocity of the apple before it hits the ground.

K.E = P.E

¹/₂mv² = 10

mv² = 2(10)

mv² = 20

0.2v² = 20

[tex]v^2 = \frac{20}{0.2} \\\\v^2 = 100\\\\v = \sqrt{100} \\\\v = 10 \ m/s[/tex]

Thus, the velocity of the apple just before it hits the ground is 10 m/s.

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Answer: [tex]29.64 \°[/tex]

Explanation:

The expression to calculate the angle [tex]\theta[/tex] of an ideally banked curve in which friciton is not needed is:

[tex]\theta=tan^{-1}(\frac{V^{2}}{r.g})[/tex]

Where:

[tex]V=16.7 m/s[/tex] is the car's velocity

[tex]r.=50 m[/tex] is the radius of the curve

[tex]g=9.8 m/s^{2}[/tex] is the acceleration due gravity

As you may see, this angle does not depend on the mass of the car.

Solving with the given values:

[tex]\theta=tan^{-1}(\frac{(16.7 m/s)^{2}}{(50 m)(9.8 m/s^{2})})[/tex]

Finally:

[tex]\theta=29.64 \°[/tex]

Answer:

200 ohms

Explanation:

Answer:

200

Explanation:

Answer:

Parallel forces lie on the same plane and they have lines of action that never intersect each other.

Explanation:

Parallel forces definition is - forces acting in parallel lines.

In physics, parallel and antiparallel forces are forces that are oriented in the same or opposite directions, as described by Newton's third law of motion. An example is the force applied to push a filing cabinet, along with the force of friction opposing it.

Parallel forces refer to forces that are oriented along the same direction, and antiparallel forces are forces that are oriented in opposite directions. An example of parallel or antiparallel forces can be observed in everyday situations such as pushing a filing cabinet. The force applied by a person to push the cabinet and the frictional force that opposes the motion are an example of antiparallel forces. Additionally, Newton's third law of motion illustrates this concept by stating that for every action, there is an equal and opposite reaction, forming a pair of parallel or antiparallel forces.

Choosing a system of interest is crucial when analyzing forces because it determines which forces are considered internal and which are external. For instance, if the system of interest includes both the Earth and a falling object, the gravitational force between them does not cause acceleration of the system as a whole because it is an internal force. However, if the system is only the falling object, then the gravitational force is external, and does not have an equal and opposite force within the system, leading to acceleration.

In physics, forces can sometimes be unified at extremely short distances and high energies, making the distinctions between them less noticeable. While forces like electromagnetic, weak nuclear, and strong nuclear forces appear distinct, they may be different manifestations of a more fundamental force, as suggested by modern physics. This unification is part of the quest for simplicity and understanding the underlying principles governing the forces of nature.

Correct Question:

Calculate the distance (in km) charlie runs if he maintains an average speed of 8 km/hr for 1 hour

Answer:

The total distance covered by Charlie is 8 km in 1 hour.

Explanation:

The average velocity as given in the question is,

v = 8 km/hr

Total time taken,

[tex]$t=1 hour[/tex]

As we know the formula to evaluate the total distance d when the average velocity and time is given;

[tex]v=\frac{d}{t}[/tex]

[tex]d=v \times t[/tex]

[tex]d=8 \times 1[/tex]

[tex]d=8 k m[/tex]

Hence, the total distance covered by Charlie in 1 hour will be 8 km.

Charlie runs a distance of 60 kilometers in 1 hour if he maintains an average speed of 60 km/h; this is calculated using the formula Distance = Speed × Time.

To calculate the distance that Charlie runs if he maintains his average speed for 1 hour, we follow a simple relation, which is: Distance = Speed × Time.

In question 8, an average speed calculation was mentioned, but since we don't have the exact number here, let's assume (based on the given information elsewhere) that the average speed we calculated previously was 60 km/h. To find the distance Charlie runs at this average speed over the course of 1 hour, we simply use the formula:

Distance = Average Speed × Time

Substituting the values we have:

Distance = 60 km/h × 1 hour = 60 km

Hence, Charlie runs a distance of 60 kilometers in 1 hour if he maintains the aforementioned average speed.

Answer: 0.26 minutes

Explanation:

Answer: 38,500 feet

Explanation:

look at the attachment where the work is done out

Explanation:

Magnet

• Magnet :- is an object which attracts pieces of iron, steel etc towards itself.  

Some facts about magnets:-  

• When magnet is freely suspended it always align towards north-south direction    

• Like poles always repel  & opp. poles attract each other.  

• Magnet always exist as dipole    

• Two poles can never be separated : if we try to cut it then still both the poles will exist even ina small piece of magnet .it automatically develops the lost polarity

Magnet always develop certain area around it where its effect can be felt ie. magnetic field.  

MAGNETIC Field  

is studied by drawing imaginary lines called magnetic lines of forces.  

  Characteristics.  

• They always originate from North pole & terminate at South pole. This shows that if north pole was free is move it would have mvre towards south pole.  

•Place where they are closer indicate strong M. field i.e. at poles.  

•Mag. Field lines gives the direction of magnetic force.  

•Two magnetic lines will never intersect each other as they give direction of force & force can’t have 2 direction at a time.  

This is what that happens in  magnetic materials .

Non magnetic materials

Types of magnetic materials

Soft magnetic materials (e.g. iron) have domains that easily move into line when the metal is placed in a magnetic field but as soon as the field is removed the domains take on a random pattern again. It returns to being unmagnetized straight away.

Hard magnetic materials (e.g. steel) have domains that do not easily move into line when the metal is placed in a magnetic field, a strong field is needed for some time, but then, when the field is removed the domains retain the magnetic pattern. The metal stays magnetic for a long time.

Answer:

(a) -8064 N

(b) 8064 N

Explanation:

(a)

From Newton’s law of motion, Force, F=ma where m is mass and a is acceleration.

Since acceleration is the rate of change of velocity per unit time, then where v is velocity and the subscripts f and I denote final and initial

For the first ball, the mass is 0.28 Kg, final velocity is zero since it finally comes to rest, t is 0.00025 s and initial velocity is given as 7.2 s. Substituting these values we obtain

[tex]F=0.28\times \frac {0-7.2}{0.00025}=-8064 N[/tex]

(b)

For the second ball, the mass is also 0.28 Kg but its initial velocity is taken as zero, the final velocity of the second ball will be equal to the initial velocity of the second ball, that is 7.2 m/s and the time is also same, 0.00025 s. By substitution

[tex]F=0.28\times \frac {7.2-0}{0.00025}=8064 N[/tex]

Here, we prove that action and reaction are equal and opposite

The average force on the first ball is -8,064 N

The average force on the first ball is 8,064 N

The formula for calculating the average force according to Newton's second law is expressed as:

[tex]F=ma\\F=m(\frac{v-u}{t} )[/tex]

m is the mass of the ball

v is the final velocity

u is the initial velocity

t is the time taken

Given the following parameters

m = 0.28kg

v = 0m/s

u = 7.2m/s

t = 250×10⁻⁶secs

Substitute the given parameters into the formula:

[tex]F=0.28(\frac{0-7.2}{0.00025} )\\F=0.28(\frac{-7.2}{0.00025} )\\F=0.28(-28,800)\\F=-8,064N[/tex]

Hence the average force on the first ball is -8,064 N

For the average force on the second ball:

[tex]F=0.28(\frac{7.2-0}{0.00025} )\\F=0.28(\frac{7.2}{0.00025} )\\F=0.28(28,800)\\F=8,064N[/tex]

Hence the average force on the first ball is 8,064 N

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Answer:g=a=10m/s^2,

M=40kg,

S=150mm/1000=0.15m*30steps each=4.5m,

F=ma=40*10=400N

Power=W/t=F*s/t=F*V=1800/6 = 300W or 0.3kW

Explanation:

Answer: KE = 4500 J

Explanation: Solution:

First convert 54 km/h to m/s

54 km/h x 1000m/ 1km x 1h /3600s

= 15 m/s

Use the equation for Kinetic Energy and substitute the values:

KE = 1/2 mv²

= 1/2 40 kg x ( 15 m/s)²

= 1/2 9000

= 4500 J

Answer:

C. 37 J

Explanation:

This problem was given with a graph showing that when the spring was elongated to 7 m, the force was approximately 11 N. Seeing as the EPE is calculated by finding the area under the graph and that the area of a triangle is found by using A = 1/2bh, you can see that the givens are b = 7 m & h = 11 N. This means that the the EPE = 1/2 * 7 m * 11 N, which is 38.5N*m. Joules are also represented by N*m so that simplifies to J and seeing as they asked for an approximation, C is the best choice! :)

The given question requires calculating the work done to pump liquid into a specifically shaped container by integrating the weight of the liquid over the height it is lifted, taking gravity into account.

The question concerns calculating the work required to pump liquid into a container. This container has been formed by revolving the region bounded by y=x^2 and the x-axis around the y-axis, between x=0 and x=2. When calculating the work done in a physics context, the scenario typically involves considerations of force, distance, and energy. For this particular case, you would use the concept of work done against gravity to fill the container with a liquid from a source below its base, which involves integrating the weight of the liquid elements being moved over the height they are lifted. The fact that pg=1 implies we're assuming a uniform density of the liquid and a gravitational field strength of 1, probably to simplify calculations. However, without additional information such as vector force fields or specific motion paths like in other provided excerpts, we can't calculate an exact numerical answer here.

Answer: It would increase.

Explanation:

The equation for determining the force of the gravitational pull between any two objects is:

[tex]F = G \frac{m1m2}{r^2}[/tex]

Where G is the universal gravitational constant, m1 is the mass of one body, m2 is the mass of the other body, and r^2 is the distance between the two objects' centers squared.

Assuming the Earth's mass but not its diameter increased, in the equation above m1 (the term usually indicative of the object of larger mass) would increase, while the r^2 would not.

Thus, it goes without saying that, with some simple reasoning about fractions, an increasing numerator over a constant denominator would result in a larger number to multiply by G, thus also meaning a larger gravitational strength between Earth and whatever other object is of interest.

Final answer:

If Earth's mass increased with its diameter unchanged, gravitational strength at its surface would also increase proportionally. The weight of objects on Earth would thus increase in direct relation to the mass increase.

Explanation:

If Earth's mass increased but its diameter remained unchanged, the gravitational strength near Earth's surface would increase proportionally to the mass increase. This is because gravitational force is directly proportional to the mass of the objects. For example, if Earth had 10 times its present mass but the same volume, a person's weight would increase by a factor of 10.

Conversely, with one-third of Earth's present mass, the gravitational force would reduce by a factor of 1/3, and a person would weigh only one-third as much as they currently do. Since the question implies that the gravitational force is what changes with the mass of Earth, we can infer that a greater mass leads to a stronger gravitational pull and thus an increase in weight for objects at the surface, assuming the radius stays constant.

Answer: [tex]4.86(10)^{-12}m[/tex]

Explanation:

The Compton Shift [tex]\Delta \lambda[/tex] in wavelength when photons are scattered is given by the following equation:

[tex]\Delta \lambda=\lambda' - \lambda_{o}=\lambda_{c}(1-cos\theta)[/tex] (1)  

Where:  

[tex]\lambda'=500 nm=500(10)^{-9} m[/tex] is the wavelength of the scattered photon

[tex]\lambda_{o}[/tex]  is the wavelength of the incident photon

[tex]\lambda_{c}=2.43(10)^{-12} m[/tex] is a constant whose value is given by [tex]\frac{h}{m_{e}.c}[/tex], being [tex]h=4.136(10)^{-15}eV.s[/tex] the Planck constant, [tex]m_{e}[/tex] the mass of the electron and [tex]c=3(10)^{8}m/s[/tex] the speed of light in vacuum.  

[tex]\theta=180\°[/tex] the angle between incident phhoton and the scatered photon.  

[tex]\Delta \lambda=2.43(10)^{-12} m (1-cos(180\°))[/tex] (2)

[tex]\Delta \lambda=4.86(10)^{-12}m[/tex] (3)  This is the shift in wavelength

The average force is -2600 N

Explanation:

First of all, we need to calculate the acceleration of the man during the collision, which is given by the suvat equation:

[tex]v^2-u^2=2as[/tex]

where:

v = 0 is his final velocity (he comes to a stop)

u = 4.0 m/s is the initial velocity

a is the acceleration

s = 0.20 m is the distance covered

Solving for a,

[tex]a=\frac{v^2-u^2}{2s}=\frac{0-4.0^2}{2(0.20)}=-40 m/s^2[/tex]

The negative sign indicates that it is a deceleration.

Now we can find the average force on the man by using Newton's second law of motion:

[tex]F=ma[/tex]

where

m = 65 kg is the mass

[tex]a=-40 m/s^2[/tex]

And substituting,

[tex]F=(65)(-40)=-2600 N[/tex]

where the negative sign indicates the force is in the direction opposite to the motion.

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To calculate the average force with which the parachuter hits the sand, we can use the equation F = ma, where F is the force, m is the mass, and a is the acceleration. The average force is approximately 67 N (in magnitude), with a negative sign indicating the direction of the force exerted on the parachuter.

To calculate the average force with which the parachuter hits the sand, we can use the equation F = ma, where F is the force, m is the mass, and a is the acceleration. Since the parachuter lands with a certain speed, we can assume that the acceleration is equal to the change in velocity divided by the time taken to come to a stop. The change in velocity can be calculated by subtracting the final velocity from the initial velocity, and the time taken to come to a stop can be found using the equation v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time taken.

Given that the mass of the parachuter is 65 kg, the initial velocity is 4.0 m/s, and the final velocity is 0 m/s, we can calculate the acceleration using a = (v - u)/t. Assuming the time taken is the same as the time taken to come to a stop, we can rearrange the equation to solve for t: t = (v - u)/a. Substituting the given values into the equation, we can calculate the time taken. Finally, we can substitute the mass and acceleration into the equation F = ma to calculate the average force.

So, the average force with which the parachuter hits the sand can be calculated as F = (65 kg) * (-(0 m/s) - (4.0 m/s))/(3.84 s), which gives a result of -67 N (or approximately 67 N in magnitude).

Final answer:

The correct notation to show that acceleration is a vector is 'â', denoting both its magnitude and direction. So the correct option is A.

Explanation:

To indicate that acceleration is a vector, the correct notation is to write the symbol 'â' (option A). Vectors are typically notated with an arrow on top, as in 'â', to represent their magnitude and direction. In physics, acceleration is defined as the rate at which velocity changes and it is a vector quantity, meaning it has both magnitude and direction. When acceleration is assumed to be constant, it is often represented simply as 'a', but when specifically referring to it as a vector, the arrow notation is used.

The energy of an object as it is in motion is defined as Kinetic energy.

Explanation:

The energy that is attained by an object when it is moving is called as Kinetic energy. It is the amount of energy that is essential for inducing an acceleration in an object and making it to displace from its idle position to the destination. When an object attains the acceleration it can have this kinetic energy until there is a change in the speed of the object with which it moves.

The forms of energy changes and it can take any form like thermal, electrical, electromagnetic,etc. Potential and kinetic energy are the two things under which these forms are energy are grouped. There can be a transferring of Kinetic energy from one object to another. The kinetic energy can also take any form of energy.  

Answer:

The zeroth law of thermodynamics states that if two thermodynamic systems are each in thermal equilibrium with a third one, then they are in thermal equilibrium with each other. Accordingly, thermal equilibrium between systems is a transitive relation.

Answer:

C. The warm air will rise, causing water vapor to condense and form clouds.

Explanation:

Answer:

dependent variable is the light the plant received

Explanation:

Answer:

kjhgfd

Explanation:

Answer:

(a) 4.21 m/s

(b) 24.9 N

Explanation:

(a) Draw a free body diagram of the object when it is at the bottom of the circle.  There are two forces on the object: tension force T pulling up and weight force mg pulling down.

Sum the forces in the radial (+y) direction:

∑F = ma

T − mg = m v² / r

v = √(r (T − mg) / m)

v = √(0.676 m (54.7 N − 1.52 kg × 9.8 m/s²) / 1.52 kg)

v = 4.21 m/s

(b) Draw a free body diagram of the object when it is at the top of the circle.  There are two forces on the object: tension force T pulling down and weight force mg pulling down.

Sum the forces in the radial (-y) direction:

∑F = ma

T + mg = m v² / r

T = m v² / r − mg

T = (1.52 kg) (4.21 m/s)² / (0.676 m) −  (1.52 kg) (9.8 m/s²)

T = 24.9 N

Answer:

B) A Compound machine

Explanation: I just took this quiz

Answer:

Magnetic materials have many spinning, unpaired electrons.

Explanation:

Any moving electric charge creates a magnetic field, also electrons since they spin and move around the nucleus. However, if two electrons are paired on the same orbital they always spin in opposite directions that causes their magnetic field to cancel out. Even if there are unpaired electrons in some atoms and these atoms act as small magnets, the magnetic field of the neighbouring atoms can have different directions and they also cancel out each other. Only presence of a large number of unpaired electrons in a material can create a significant magnetic field. This is the root part of the definition of magnetic properties of material.

Answer: the correct answer is: Magnetic materials have many spinning, unpaired electrons

Explanation:

I just took the test

Answer:

11 m/s²

Explanation:

Acc = v/t

Acc = 22 / 2.0

Acc = 11 m/s²

Answer: a= m/s divide by sec

22m/s divided by 2.0sec

11m/s

Explanation: dividing the meter per second [m/s] by the second [s

Answer:

a) 24 J

b) Gravitational Force

c) 45 J

d) 0

e) 6.782m/s

Explanation:

a) m = 3kg

v = 4m/s

h = 1.5m

KE = ?

0.5 * 3 * 16 = 24J

b) Gravitational force

c) F = ma = 3 * 10 = 30N

Work done = Force * distance = 30 * 1.5 = 45J

d) Final Kinetic Energy of the ball is zero because the ball eventually stops moving

e) velocity of ball as it strikes the ground = v

[tex]v^{2} - u^{2} = 2as[/tex] where

v is the velocity as it strikes the ground

u is the initial velocity

a is acceleration

s is the distance

Now since the ball is thrown downwards, a is positive because the velocity of the ball is increasing as the gravitational force acts on it

u = 4m/s

a = 10

s = 1.5

=>  [tex]v = \sqrt{2as + u^{2} }[/tex]

= [tex]\sqrt{(2*10*1.5) + 16}[/tex]

= [tex]\sqrt{46} = 6.782m/s[/tex]

The heart rate that indicates your fitness level is the Resting Heart Rate.

Explanation:

The statement from Welch says that when we practise more and do an exercise harder, then the heart rate at rest would be low. This is the main reason for considering resting heart rates as a good indicator to one’s fitness level. The normal adult heart rate at rest is 60 to 100 bpm (beat per minute).

In general, a lower heart rate means a calmer heart rate and good heart health. For example, for a well-trained athlete, a normal heart rate can be closer to 40 bpm. Our resting rhythm, the measure of how often the heart beats every minute at rest.