please help with this assignment paper in science.

I gotta get it done before Monday.

thx. ​

Answer:

Explanation:

Given:

Mass of the object = [tex]40[/tex] pound

We have to calculate force (N).

Newton = [kg.ms^-2]=[MLT^-2]

So we have to convert the units.

[tex]1[/tex] pound = [tex]0.45[/tex] kg

[tex]40[/tex] pound = [tex]0.45\times 40 = 18.14[/tex] kg

Here Force and Weight are equivalent as the object is in stationary state.

Weight= product of mass and gravity.

Value of g = 9.8 ms^-2

Force = [tex]m\times g[/tex]

So the force of the object in (N) = [tex]18.4\times 9.8[/tex]

                                                     = [tex]177.77\ N[/tex]

The force in units of Newtons = 177.77

Answer:

D: chromosomes fail to separate properly during meiosis

Explanation:

It would have more kinetic energy at the start, resulting in greater potential energy at the bottom of the track.

Answer: Option A.

Explanation:

The car at the race track will accelerate at point X. It will have more kinetic energy at the start because the car is at the slope and with time it will result in greater potential energy at the bottom.

As we go down towards the bottom of the track, the kinetic energy will get converted into potential energy because here the body starts coming at rest and is not moving.

Answer:

yall its A

Explanation:

the answer is attraction

Answer:

the answer is b.

Explanation:

cause i took the test

Answer:

5 cm

Explanation:

Centripetal force varies directly with mass and the square of velocity, and inversely with radius.  If k is the constant of proportionality:

F = k m v² / r

When m = 7 g, v = 20 cm/s, and r = 25 cm, then F = 112 dynes.  Solving for k:

112 = k (7) (20)² / 25

k = 1

When m = 17 g, v = 40 cm/s, and F = 5440 dynes:

5440 = 1 (17) (40)² / r

r = 5

The radius is 5 cm.

The radius of the circle is 5 cm.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Given that: The centripetal force of an object moving in a circle varies jointly with the mass of the object and the square of its velocity and

inversely as the radius of the circle.

So, F ∝ mv²/r

F = kmv²/r.

In first case:

Mass of the object; m = 7 gram.

Radius of the circle; r = 25 cm.

Velocity of the object : v =20 cm/s.

And centripetal force: F = 112 dyne.

So, 112 = k 7×20²/25

⇒ k = 1.

In second case:

Mass of the object; m = 17 gram.

Velocity of the object : v =40 cm/s.

And centripetal force: F = 5440 dyne.

Radius of the circle; r =?

So, 5440 = 1×17 ×40²/r

⇒ r = 5 cm.

Hence  the radius of the circle is 5 cm.

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The strength of the magnetic field is 0.089 T

Explanation:

The force caused by a magnetic field on a current-carrying wire is given by the equation

[tex]F=ILB sin \theta[/tex]

where

I is the current in the wire

L is the length of the wire

B is the strength of the magnetic field

[tex]\theta[/tex] is the angle between the direction of the field and the wire

In this problem, we have

L = 0.57 m

I = 9.7 A

F = 0.49 N

[tex]\theta=90^{\circ}[/tex] since the wire is perpendicular to the field

Solving for B, we find the strength of the field:

[tex]B=\frac{F}{ILsin \theta}=\frac{0.49}{(9.7)(0.57)(sin 90^{\circ})}=0.089 T[/tex]

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Answer:

An object gets charged when it's atoms lose or gain an electron to become an ion. For example: ... This means that the fur loses it's electrons to the plastic rod and both objects are now charged. The fur is positively charged because it lost electrons and the rod is negatively charged because it gained electrons

Explanation:

comment how it helps

Answer:

An object becomes charged when it loses or gains electrons.

Explanation:

There are three ways to charge an object:

1)friction,

2)conduction

3)induction.

1) Friction involves rubbing on material with another, resulting in electrons moving from one surface to another.

2)Conduction on the other hand is used to charge things that are good conductors, such a metal.

3)The final way to charge an object is by induction and is, again, best for conductive materials.

Answer:

The separation of the single population (allopatric speciation) led to speciation.

Explanation:

"Speciation" refers to the evolutionary process of organisms in order to become a "distinct" species. There are several factors affecting speciation and these are: Genetic Drift, Natural Selection, Mutation and Geographic Isolation.

The situation above is an example of the factor called "Geographic Isolation."  This type of isolation is reproductive in nature. This happens when organisms are separated or divided by a barrier. In the case above, the fruit flies were divided into different cages. One cage was for fruit flies who  fed on maltose-based foods, while the other cage was for fruit flies who fed on starch-based foods.

More specifically, this case may also be referred to as "allopatric speciation." It happens when a single population is divided. Thus, over time the separated species acquire genetic differences. These differences prevent them from breeding with each other once they are reunited. This is the reason why the maltose-based flies prefer to mate only maltose-based flies as well.

Answer: Habitat isolation

Explanation: I just guessed

Answer: a= fnet/m

Explanation:

a = (v - u)/t

It is the formula for finding acceleration

The second option G. Docs is a free, cloud-based word processor that allows you to create, edit, and collaborate in real-time with other users.

G. Docs is a web-based application offered by G.o.o.g.l.e within its suite of office tools. It allows users to create, edit, and store documents online, enabling real-time collaboration. Multiple users can simultaneously work on the same document, making it an excellent tool for collaborative projects. G. Docs automatically saves changes, reducing the risk of data loss, and offers seamless integration with G. Drive for easy storage and sharing of documents. The cloud-based nature of G. Docs eliminates the need for specific operating systems, making it accessible from various devices with internet connectivity.

In summary, the correct answer is G. Docs, a versatile cloud-based word processor that promotes efficient collaboration and accessibility across different platforms.

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Final answer:

The field of physical science mainly combines the subjects of Physics and Chemistry, with significant interdisciplinary overlap where these subjects connect with others like Biology and Earth Science. Chemistry, serving as the 'central science,' bridges various areas within the physical and life sciences.

Explanation:

The field of physical science primarily combines the subjects of Physics and Chemistry. Physical science is a broad term that encompasses various sciences dealing with inanimate natural objects and the laws that govern them. It is distinct from the life sciences (like Biology), which concern living organisms. In the interdisciplinary nature of scientific study, there is significant overlap among various fields; Chemistry is often termed the "central science" due to its integral role in connecting physical, earth, and life sciences. Fields such as biochemistry combine principles of Biology and Chemistry, while geophysics might combine Geology with Physics.

Earth Science and Chemistry also have significant overlap, for example in geochemistry. However, when referring specifically to the major branches that make up physical sciences, Physics and Chemistry are the core focus. Additionally, mathematics plays a crucial role across all scientific disciplines, as it provides the language in which scientific laws and phenomena are expressed. This interconnected nature of sciences leads to the creation of various interdisciplinary fields, illustrating the difficulty in drawing distinct boundaries between each scientific discipline.

Roller coasters convert potential energy into kinetic energy as they go downhill due to gravity which increases their speed. This kinetic energy is converted back into potential energy as they go uphill and slow down. This cycle continues until friction and air resistance slow the roller coaster down.

Roller coasters are an exciting way to experience the conversion of potential energy to kinetic energy and back again. Let's break down this concept in simpler terms.

1. The roller coaster car starts with a high potential energy at the starting point, usually at the top of a hill. The car gets this energy from the work done by the machines that lift it up to this starting height.

2. As the roller coaster starts to move down the slope, this potential energy begins to convert into kinetic energy. The potential energy decreases while the kinetic energy increases - this is due to the car's increased speed due to gravity pulling it downhill.

3. At the lowest point of the track, the car has the maximum kinetic energy and minimum potential energy.

4. When the car again starts to climb up another smaller hill, the kinetic energy is converted back into potential energy as the car slows down and gains height.

5. In a frictionless situation, this process would continue without end. However, in reality, some energy is lost due to friction and air resistance, and that's why roller coasters eventually come to a stop.

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Answer:

yes it is D

Explanation:

The following statements true about the force of friction is Friction acts in the direction opposite to an object's motion. The correct option is D.

When an object is moving on a rough surface, it experiences opposition. This opposing force is called the friction force.

When an object experiences force, it moves in the direction of force, but opposed due to roughness of the surface. This opposition offered is opposite to the force applied. Their directions are opposite to each other.

Thus, the correct option is D.

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Answer:

4800N

Explanation:

F=GmM/r^2

F=infinite m

F=2F

=2(2400N)

=4800N

Answer:4800 N

Explanation: you just multiply

North Pole and South Pole.

Answer:

The amount of work done in order to lift the box is [tex]150\ Joule[/tex]

Explanation:

Given the weight of each box is [tex]100N[/tex]

And the man lifts boxes at a height of [tex]1.5m[/tex]

We need to find the amount of work done.

The amount of work done is the product of applied force [tex]F[/tex] that causes the displacement [tex]d[/tex].

In our problem force is [tex]100N[/tex] and displacement is  [tex]1.5m[/tex].

Now, work done

[tex]=force\times displacement\\=100\times1.5\\=150\ Joule[/tex]

So, the amount of work done in order to lift the box is [tex]150\ Joule[/tex]

Answer:

It takes 58.8 seconds to swim the length of a olympic-sized pool.

Explanation:

Uniform Velocity Motion

It describes the situation when an object moves in such a way that it travels equal distances at equal times in the same direction. For example, if it travels x=50 m in t=10 seconds and later it travels x=200 m in t=40 seconds, its speed is constant and equal to v=5 m/s. The relation between the variables x,t, and v is

[tex]x=v.t[/tex]

We know a swimmer is traveling at a constant speed of 0.85 m/s. We are required to find how long would it take him to swim the length of an x=50-meter Olympic-sized pool.

From the above equation, we solve for t

[tex]\displaystyle t=\frac{x}{v}[/tex]

[tex]\displaystyle t=\frac{50\ m}{0.85\ m/s}[/tex]

[tex]\boxed{t=58.8\ s}[/tex]

It takes near 59 seconds to swim the length of a olympic-sized pool

A swimmer would take about 59 seconds to swim the length of a 50-meter Olympic-sized pool when traveling at a constant speed of 0.85 m/s.

The time it takes to cover a specific distance traveling at a constant speed can be calculated using the equation time = distance / speed.

In this question, the swimmer is traveling at a constant speed of 0.85 meters per second and the distance to be covered is a 50-meter Olympic-sized pool. To solve the problem we will use the equation stated above:

time = 50 m / 0.85 m/s = 58.82 seconds approximately.

So, at a constant speed of 0.85 m/s, it would take a swimmer about 59 seconds to swim the length of a 50-meter pool.

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Answer:

a.25J b.6J c.6J d.31J e.[tex]\sqrt{31}[/tex] m/s

Explanation:

a. using the formula Ek=1/2mv^2, the kinetic energy would be 1/2*2*5^2=25J

b. we can separate the work the child applied. So the work he/she applied would be 2*3=6J (W=FS)

c. by the "Energy conservation law", we knew the energy can be "add up" since they wouldn't "disappear". Thus, the change in the car’s kinetic energy is 6J.

d.25+6=31J

e.now you know the new Ek, and the m, just use the formula again! 31=1/2*2*v^2. So the velocity after the child push it would be [tex]\sqrt{31}[/tex] m/s

The kinetic energy and the work done by the car is:

(a) 25 J

(b) 6 J

(c) 6 J

(d) 31 J

(e) 5.57 m/s

According to the question,

Force,

Distance,

(a)

The Kinetic energy of the car will be:

→ [tex]K_i = \frac{1}{2} mv_0^2[/tex]

       [tex]= \frac{1}{2}\times (2)\times (5)^2[/tex]

       [tex]= 25 \ J[/tex]

(b)

The work done by the car will be:

→ [tex]W = fd[/tex]  

       [tex]= 3\times 2[/tex]

       [tex]= 6 \ J[/tex]

(c)

The change in the car's K.E will be:

→ [tex]\Delta K = W[/tex]

          [tex]= 6 \ J[/tex]

(d)

The car's final K.E will be:

→ [tex]K_f = W+K_i[/tex]

        [tex]= 6+25[/tex]

        [tex]= 31 \ J[/tex]

(e)

The final velocity of the car will be:

→ [tex]v_f = \sqrt{\frac{2 K_f}{m}}[/tex]

       [tex]= \sqrt{\frac{2\times 31}{2} }[/tex]

       [tex]= 5.57 \ m/s[/tex]

Thus the above solution is correct.

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Answer:

Voltage describes the potential difference between the two ends of a conductor and thus , more the voltage , more will be the flow of current through the conductor ( more no of electrons and faster speed).

Explanation:

Voltage represents the potential difference between two ends of a conductor, and so the greater the voltage, the greater the current flow through the wire.

Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.

Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.

This current-voltage connection may be expressed mathematically as,

The Equation of Ohm's Law

V=IR

Voltage represents the potential difference between two ends of a conductor, and so the greater the voltage, the greater the current flow through the wire.

Hence, Voltage is described as the product of the current and the resistance.

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The initial velocity is [tex]6.7 m/s[/tex]

Explanation:

The motion of the ball is a projectile motion, therefore it consists of two independent motions:  

- A uniform motion (constant velocity) along the horizontal direction  

- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction  

In this problem, we just need to analyze the horizontal motion: the horizontal velocity is constant, therefore the horizontal distance travelled is given by

[tex]x=v_x t[/tex]

where

[tex]v_x[/tex] is the horizontal velocity

t is the time of flight

Here we have:

t = 0.45 s

x = 3.0 m

And so solving for [tex]v_x[/tex], we find

[tex]v_x = \frac{3.0}{0.45}=6.7 m/s[/tex]

And since the ball was initially projected horizontally, this is also the initial velocity.

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The initial velocity of the ball is 6.67 m/s.

To determine the initial velocity of the ball, we need to use the horizontal motion equation, which states that the horizontal distance traveled equals the product of the initial velocity and the time of flight. In this case, the horizontal distance traveled is 3.0 m and the time of flight is 0.45 s. Rearranging the equation, we find that the initial velocity is equal to the horizontal distance divided by the time of flight.

Initial velocity = horizontal distance / time of flight = 3.0 m / 0.45 s = 6.67 m/s

Therefore, the initial velocity of the ball is 6.67 m/s.

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The number of energy levels increases as you move down a group as the number of electrons increases

Explanation:

The determination of distance of separation between the two nuclei of likely atoms connected together called atomic radius. This in a group usually increases from top to bottom. With the increase in the atomic number in the group, the positive nuclear charge increases again. However, the amount of principle energy is also increasing.

High principle energy levels made up of orbits of higher size than low energy levels. The impact of this exceeds the increased nuclear charge, and thus the atomic radius gets increased when going down a group in the periodic tables.

Atomic radius gradually decreases from the side left to the right during the elemental period. This is because all electrons of the same size are added over time or in a family of elements.

Answer:

Literally, the Atomic radius of a chemical element is a term used to describe the size of an atom.

Atomic radius can be regarded as a measure of the size of its atoms. This is often characterized by the mean or typical distance of the chemical element from the center of the nucleus to the boundary of the surrounding shells of electrons.

In general, the size of an atom will decrease as you move from left to the right of a certain period

Periodic Trends of Atomic Radius. An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements.

6) True: the car is exerting an equal and opposite force on the truck

7) True: the astronaut can drift back by throwing the tool forward

8) True: the bug exerts an equal and opposite force on you

9) Second Law

Explanation:

6)

This problem can be solved by applying Newton's third law of motion, which states that:

"When an object A exerts a force (action) on another object B, then object B exerts an equal and opposite force (reaction) on object A"

In this problem, we can identify the car and the truck as object A and object B. Here we are told that the truck is exerting a force on the car: therefore, according to Newton's third law, the car is also exerting an equal and opposite force on the truck.

Therefore, the statement is true.

7)

This problem can be also solved by thinking in terms of the Newton's third law of motion.

In fact, at the beginning the astronaut is drifting away from the space station. When he throws away the tool, in the forward direction (away from the space station), he exerts a force on the tool: we can identify this force as the action force, and its direction is away from the space station.

As a result, according to Newton's third law, the tool will also exert a reaction force (equal and opposite) on the astronaut: therefore, the force exerted by the tool on the astronaut is toward the space station, and therefore the astronaut will be pushed back towards the station.

Therefore, the statement is true.

8)

Again, this problem can also be explained using Newton's third law.

In fact, the moment you step on the bug, your foot exerts a force (the action force) on the bug, pushing downward.

As a result, according to Newton's third law, the bug exerts back on you an equal and opposite force (upward). The reason you don't feel this force at all is that your mass is much larger than that of the bug, therefore your acceleration is negligible.

Therefore, the statement is true.

9)

This problem can be explained by using Newton's second law, which states that the net force acting on an object is equal to the product between its mass and its acceleration. Mathematically:

[tex]F=ma[/tex]

where

F is the net force

m is the mass

a is the acceleration

In this problem, the ball slows down as it crosses the field: this means that it has an acceleration (more precisely, a negative acceleration). According to the law, this means also that there is a net, unbalanced force acting on it, in the direction opposite to the motion of the ball. In fact, this force is the force of friction between the ball and the surface.

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Answer:0.2m/s^2

Explanation: newton's first law of motion: F=ma. Fnet=applied force-frictional force. Therefore, Fnet=ma. Make "a" the subject of the formula which will result a=(Fappl-Frict)m.

Therefore a=(25-5)N/100kg

a= 20/100

a= 0.2m/s^2

A boat's motor exerts 25 N of force, while viscous friction exerts 5 N. The boat's acceleration is 0.2m/s² if it weighs 100 kg.

Therefore a = (25-5)N/100kg

a = 20/100

a = 0.2m/s²

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Answer:

5A

Explanation:

In case 1, I = 10A, V = 150volt

Using Ohms law, V = IR

R = V/I = 150/10 = 15 ohms

Case 2, when R is double

R = 15 ohms

I = V/R = 150/30 = 5A

Answer:

5 A

Explanation:

The centripetal acceleration is 27.692 kg m / s^2.

The mass of the ball is 7.94 kg.

Explanation:

            centripetal force Fc = (mass * square of velocity) / radius

where m represents mass in kg

          v represents  velocity

          r represents radius in a meter.

                                                             = (6 * 6) / 1.3

                                                             = 27.692 kg m / s^2.

 The mass of the ball is found by using the centripetal force formula,

                                                      m = (F * r) / v^2

                                                          =  (220 * 1.3) / 36

                           mass of the ball  m = 7.94 kg.

Answer:

It is C, undergoes the most change.

Explanation:

Horizon O forms at the surface due to the accumulation of organic material

Horizon A is mineral rich and forms due to decomposed organic material from above

Horizon B undergoes the most change and no longer resembles parent material

Horizon C features parent material and is barley affected by the soil formation process

Edg2020 notes :)

Answer: 4.6 years

Explanation:

According to Kepler’s Third Law of Planetary motion “The square of the orbital period [tex]T[/tex] of a planet is proportional to the cube of the semi-major axis [tex]a[/tex] (size) of its orbit”:

[tex]T^{2}\propto a^{3}[/tex] (1)  

However, if [tex]T[/tex] is measured in Earth years, and [tex]a[/tex] is measured in astronomical units (unit equivalent to the distance between the Sun and the Earth), equation (1) becomes:  

[tex]T^{2}=a^{3}[/tex] (2)  

Knowing [tex]a=2.768 AU[/tex] and isolating [tex]T[/tex] from (2):  

[tex]T=\sqrt{a^{3}}[/tex] (3)  

[tex]T=\sqrt{(2.768 AU)^{3}}[/tex] (4)  

Finally:  

[tex]T=4.6 years[/tex] This is Ceres' orbital period

The wavelength of the wave does not affect the speed of wave. Therefore, the given statement is false.

Wavelength can be described as the distance between identical points or adjacent crests in the adjacent cycles of a waveform propagated in space.

Wavelength can be defined as an inversely related to frequency, which denotes to the number of wave cycles per second. The higher the frequency of wave, the shorter will be its wavelength.

The change in amplitude of the sound wave does not affect its speed. The speed of sound affects by the properties of the medium through which it is traveling.

Changing the wavelength of the sound wave has no effect on the speed of sound. As the distance from the source will increase, the amplitude of the sound wave decreases. The speed of sound depends on the density or nature of the medium.

Therefore, the speed of sound wave can only be changed by changing the medium.

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Final answer:

The claim that increasing the wavelength changes the speed of a sound wave is false, as sound speed is determined by the medium and the relationship between frequency and wavelength, not by the wavelength alone.

Explanation:

The statement 'You can change the speed of a sound wave by increasing the wavelength' is false. The speed of sound (v) is determined by the medium through which it travels and is expressed by the formula v = fλ, where f is the frequency and λ is the wavelength.

Since frequency (f) is determined by the source and remains constant when sound moves from one medium to another, if the speed of the wave (v) changes due to changing medium, the wavelength (λ) must correspondingly adjust to maintain this relationship. Hence, the only way to change the speed of sound is by changing the medium, not by directly altering the wavelength.

Answer:

D

Explanation:

If someone has to find the direction of the magnetic field lines, they would have to keep a compass near it, then it's north pole would show the direction.

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The best description of a magnetic field line is option D. A magnetic field line shows the direction a compass needle would point.

⇒ Magnetic subject traces do not intersect each other.

⇒  They emerge from the north pole and merge/end at the south pole.

⇒ They flow from the north pole to the south pole outdoor the fabric and from the south pole to the north pole within a material.

⇒these lines formed are cl

osed curves.

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