A train travels at 100 km/h heading east to reach a town in 4 hours. The train then reversed ad heads west at 50 km/h for 4 hours

Answer:

According to " The second law of thermodynamics", the randomness of the universe is constantly increasing?

Explanation:

So answer option C. Have a great summer.

Answer:

h = 0.288m

Explanation:

Assume

\(v_1\) = Speed of Sue

\(v_2\) = Speed of Chris immediately after the push

Sue's KE = \(\frac{1}{2} mv_1\ ^2 = 26 v_1 \ ^2\)

now she swings this is converted into gravitation at PE of

mg n = 52 × 9.8 × 0.65  

= 331.24

\(26v_{1}\ ^2\) = 331.24

So, \(v_1 = 3.569\)

They started at rest by conservation of momentum in case of push off the magnitude of sue momentum and it is equal to the magnitude of Chris momentum in the opposite or inverse direction

\(m_1v_1 = m_2v_2\)

\(52 \times 3.569 = 78 \times v_2\)

\(v_2 = 2.380\)

Chris kt = \(\frac{1}{2} \times 78 \times 2.380^2\)

= 220.827

220.827 = mgh

So, h = 0.288m

Answer:

−34.83 m/s

Explanation:

Answer:

wow

Explanation:

Answer: iron

Explanation: yw

The potential energy of the roller coaster is 176,400 J (joules).

The potential energy of an object is given by the formula PE = mgh, where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height or vertical position of the object.

In this case, the roller coaster is at a peak of 20m and has a mass of 900kg. The acceleration due to gravity, g, is approximately 9.8 \(m/s^2\).

Using the formula, we can calculate the potential energy:

PE = mgh

= (900 kg)(9.8 \(m/s^2\))(20 m)

= 176,400 J

Therefore, the potential energy of the roller coaster is 176,400 J (joules).

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Answer:

(B) Its acceleration is constant in size but not in direction

(Note vector quantities are not constant in direction here)

What happened to the plane's kinetic energy is that "On the return flight, the plane has less kinetic energy".

option C is the correct answer.

The kinetic energy of an object is the mechanical energy of the object due to its motion.

Mathematically, the formula for kinetic energy is given as;

K.E = ¹/₂mv²

where;

From the equation above, the kinetic energy of an object increases with increase in the mass and velocity of the object.

For a airplane carrying 320 passengers initially  and on return carries 164 passengers flying at the same speed of 490 miles per hour. The initial kinetic energy of the plane will be greater than the final kinetic energy because of the decrease in mass in the return trip.

Thus, the final kinetic energy of plane will reduce due to decrease in the number of passengers.

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Answer:

(Question) A city gets its electricity from a dam, where water is stored in a reservoir. How does the water provide the city with its power?

(Answer) Potential energy in the water becomes kinetic energy as it moves through turbines, which turn kinetic energy into mechanical energy that spins a generator, which changes mechanical energy into electricity.

(Question) An acorn rolls off a roof and falls to the ground. Which statement best describes the change in energy?

(Answer) The acorn’s potential energy decreases as its kinetic energy increases.

(Question) An airplane carries 320 passengers from Phoenix to Los Angeles flying at an average speed of 490 miles per hour. On the return flight, the plane carries 164 passengers and travels at the same average speed. What happens to the plane’s kinetic energy?

(Answer) On the return flight, the plane has less kinetic energy.

(Question) A racehorse is running at 42 miles per hour, equivalent to 18.8 meters per second. The horse and its jockey have a combined mass of 512 kilograms. How much kinetic energy do they have?

(Answer) 90,480.6 J

(Question) Which object has kinetic energy?

(Answer) balloon rising in the sky

(Question) Mr. Starr pushed a cart full of groceries to his car. After emptying the cart, he pushed it back to the store. He pushed the cart at a speed of 2 meters per second each way. Which is the best prediction?

(Answer) When it was empty, the cart had less kinetic energy.

(Question) A student fires a toy rocket into the sky. When does the rocket have the most potential energy?

(Answer) when the rocket reaches its highest point

(Question) What is the best description of one billiard ball hitting a second billiard ball?

(Answer) Most of the kinetic energy in the first ball is transferred to the second ball.

(Question) A roller-coaster car is at the top of a hill. The car and its passengers have a combined mass of 1,088 kilograms. If the hill is 62 meters tall, how much potential energy does the car have?

(Answer) 661,068.8 J

(Question) A roller-coaster is at the top of a 62-meter hill. The car and its passengers have a total mass of 1,088 kilograms. By the time the car reaches the bottom of the hill, its speed is 74 miles per hour (33 meters per second). How much kinetic energy does the car have at the bottom of the hill?

(Answer) 592,416 J

(Question) A diagram is drawn showing a swing set with a swing pulled backward prior to release. The diagram shows how the swing will move forward and then backward after it is initially released. At which point in the diagram is all of the energy gravitational potential energy?

(Answer) when the swing is pulled back prior to release

(Question) essay

(Answer) good luck

(Question) essay

(Answer) good luck

Explanation:

I just finished the assignment.

Answer: 5

Explanation: If you use a real graph it could be easier to check, but here’s it the easy way.

You start at 0, add 3 as you are going right on the right , subtract 4 as you are going left, then again add 6 as you are going right, and you should get 5.

0+3= 3

3-4= -1

-1+6= 5

Answer:

Whenever one body exerts a force on a second body, the first body experiences a force that is equal in magnitude and opposite in direction to the force that it exerts

Explanation:

Answer: According to Khan Academy "Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A.

Explanation: This law represents a certain symmetry in nature: forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself. We sometimes refer to this law loosely as action-reaction, where the force exerted is the action and the force experienced as a consequence is the reaction.

We can readily see Newton’s third law at work by taking a look at how people move about. Consider a swimmer pushing off from the side of a pool, as illustrated below.

A swimmer pushes on the wall with her feet, which causes the wall to push back on her feet due to Newton's third law."

Hope this helps ^_^ and have a great day

Answer:

First the charge is given 7.50×10^-6

Explanation:

so that we have

\(90 \)

then the direction is one is left and other one is right so thats my hint

Answer:

96,000joules!!!

Explanation:

Hope this helps u

Answer: The force of gravity, or gravitational force, pulls objects with mass toward each other.

We often think about the force of gravity from Earth. This force is what keeps your body on the ground.

But any object with mass exerts a gravitational force on all other objects with mass. For example, there is a gravitational force between you and every object around you.

The gravitational force between two objects is larger when the masses of the objects are larger. That’s why you can feel the gravitational force between you and Earth, but the force between you and objects with smaller masses is too weak to feel.

The gravitational force between two objects also depends on the distance between their centers. The further objects are from one another, the weaker the force is.

Answer:

I have no clue I'm just trying to get points

Explanation:

:) sorry

Answer:

the first one

The time taken for the wheelchair to reach the top of the ramp will be 32.7 seconds.

Power is the time rate at which work is accomplished.

Energy divided by time is a rate of work because, the energy is a change in energy and a change in energy equals to workdone.

Power = Workdone/Time taken

P = (mgh)/t

Where;

Power = 300watts

m = 50kg + 50kg

m = 100kg

g = 9.8m/s2

h = 10 meters

300 = (100 x 9.8 x 10) / t

t = 9800/300

t = 32.7seconds

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Answer:

The speed of light traveling through a vacuum is exactly 299,792,458 meters (983,571,056 feet) per second. That's about 186,282 miles per second — a universal constant known in equations as "c," or light speed.

\(s\frac{d}{t}\)

Explanation:

hope this helps you my friend

\(\\ \sf\Rrightarrow Distance=Speed\times Time\)

\(\\ \sf\Rrightarrow Distance=12(3)\)

\(\\ \sf\Rrightarrow Distance=36km\)

Time of flight = 1.6 s

Horizontal distance = 64 m

Projectile motion is the form of motion experienced by an object or particle projected into a gravitational field, such as from the surface of the Earth, and moves along a curvilinear path only under the action of gravity.

For the given case,

h = vt + ¹/₂gt²

h = height of tower

v = initial velocity

t = time of flight

55 = 50sin30t + ¹/₂9.8t²

55 = 25t + 4.9t²

4.9t² + 25t - 55 = 0

t = 1.6 s

X = vₓt

X = horizontal distance

vₓ = horizontal velocity

t = time of flight

X =  (50 x cos30) x 1.6

X =  64 m

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Answer:

The correct answer is "22.27 hours".

Explanation:

Given that:

Radioactive isotope activity,

= 490,000 Bq

Activity,

= 110,000 Bq

Time,

= 48 hours

As we know,

⇒ \(A = A_0 e^{- \lambda t}\)

or,

⇒ \(\frac{A}{A_0}=e^{-\lambda t}\)

By taking "ln", we get

⇒ \(ln \frac{A}{A_0}=- \lambda t\)

By substituting the values, we get

⇒ \(-ln \frac{110000}{490000} = -48 \lambda\)

⇒    \(-1.4939=-48 \lambda\)

                 \(\lambda = 0.031122\)

As,

⇒ \(\lambda = \frac{ln_2}{\frac{T}{2} }\)

then,

⇒ \(\frac{ln_2}{T_ \frac{1}{2} } =0.031122\)

⇒ \(T_\frac{1}{2}=\frac{ln_2}{0.031122}\)

         \(=22.27 \ hours\)  

Answer:

no.

Explanation:

Because it doesnt move. the reason the earth r o t a t e s on its axis is so you could have day and night as the earth circles the sun it also rotates because the sun itself doesnt move if that makes sense. if the earth wouldnt rotate we simply would just have either day or night depending on where you live. Meaning one side would always face the sun causing it to be way to hot as the other side would just be way to cold. at this point it basically would not be possible for life to live on.

Hope this helps.

Answer:

Both of these minerals precipitate from water as a chemical sediment. Both minerals are used commercially.

Explanation:

Answer:

Answer is 7.50 N

Explanation:

Answer:

10 and 5

Explanation:

Answer:

It is given that,

Force, F = 30 pounds = 133.4 N

Distance, d = 15 feet = 4.572 m

Time taken, t = 3 minutes = 180 seconds

Lucas's speed is given by the ratio of total displacement divided by total time taken. It is given by :

s = 0.0254 m/s

So, her speed is 0.0254 m/s.

Work done, W = F . d

W = 133.4 N × 4.572 m

W = 609.90 J

or

W = 610 J

Hence, this is the required solution.

Endarterectomy is used to reduce the risk of stroke and correct the stenosis in the artery.

The primary blood vessels that supply the brain with blood and oxygen are the carotid arteries.

The narrowing of these arteries is referred to as carotid artery disease. Carotid artery stenosis is another name for it. The main factor causing constriction is atherosclerosis.

This fat deposit reduces the blood flow to the brain which cause a stroke.

Carotid endarterectomy is a surgical treatment to remove plaque, an accumulation of fatty deposits that causes a carotid artery to become narrowed.

Hence, an Endarterectomy is used to reduce the risk of stroke, it will correct stenosis in the artery.

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The traits represent the people's characteristics patterns of thoughts, feelings and also behaviour.

Traits are distinguishing qualities or characteristics, typically one belonging to a person. A trait has a characteristic that someone has. These characteristics may be positive and maybe negative. We can easily recognize the trait of someone by looking at his behaviour like his walking style, speaking style and many other things. We can change the trait of a person by doing work on him. This is due to the traits that some people are more likely to act, think, and feel in certain ways than others.

So we can conclude that the traits represent people's characteristics patterns of thoughts, feelings and also behaviour.

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Complete question is;

A fisherman’s boat moves up and down periodically due to water waves. The boat travels from its highest to its lowest point, a vertical distance of 0.60 m, in 2.0 s. The horizontal distance between wave crests is 7.0 m. (a) What is the period of the wave motion? (b) What is the frequency of the wave motion? (c) What is the amplitude of each wave

Answer:

A) Period = 4 s

B) Frequency = 0.25 Hz

C) Amplitude = 0.3 m

Explanation:

A) We are told that the distance it takes for the boat to travel from its highest to its lowest point is 2 s.

Thus, t = 2 s

Now, in waves, period (T) it the time between two successive waves.

This means that;

T = 2t

T = 2 × 2

T = 4 s

B) Also, the frequency(f) is given by the formula;

f = 1/T

f = 1/4

f = 0.25 Hz

C) We are given a vertical distance of 0.60 m from highest to lowest point of waves.

Now, amplitude is half of this distance.

Thus;

Amplitude(A) = 0.6/2

A = 0.3 m