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3 years ago

When a wave is acted upon by an external damping force, what happens to the energy of the wave

Physics

2 answers:

Rasek [7]3 years ago

8 0

The energy of the wave decreases gradually

bazaltina [42]3 years ago

3 0

Answer:

Explanation:

The energy of the wave its determined by the mass of the fuid of the wave and the speed. The amount of motion equation P= m.v

So according to the impulse and amount of motion theorem (ΔP= mvₙ- mv₀).

If the wave is acted upon by an external dumping force, the wave its going to decrease his energy because the reduction of the speed and the mass.

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A fugitive tries to hop on a freight train traveling at a constant speed of 4.5 m/s. Just as an empty box car passes him, the fu

Andrews [41]

Ok,
Let's check to see if he catches it before he reaches 8 m/s.
Velocity = acceleration * time, V = at,
so 8 m/s = 3.4 m/s * t, so t = 2.35 sec
in that time he moved
Distance = Initial Velocity * time + 1/2 acceleration * time * time
S = 0*2.35 + 1/2*3.4*2.35*2.35 = 9.4 meters
in 2.35 seconds, the boxcar moved
S = V*t = 4.5 * 2.35 = 10.59 meters, so he still needs to catch up
10.59 m - 9.4 m = 1.19 meters. Since he is now moving at 8 m/s and the train is moving at 4.5 m/s, his closing speed is (8 - 4.5) = 3.5 m/s

It will take him 1.19m/3.5m/s = .34 seconds more to catch up.

So answer A is 2.35 sec + .34 sec = 2.69 seconds.
For answer B we use the speed of the train since it was constant,
<span>Distance = Velocity * time = 4.5 m/s * 2.69 s = 12.1 meters.
</span>

I hope my answer has come to your help. Thank you for posting your question here in Brainly.

7 0

3 years ago

3 write the three laws given by kepler.How did they help Newton to arrive at the inverse square law of gravity?

stiv31 [10]

Answer:

Kepler's laws apply: First Law: Planetary orbits are elliptical with the sun at a focus. Second Law: The radius vector from the sun to a planet sweeps equal areas in equal times. Third Law: The ratio of the square of the period of revolution and the cube of the ellipse semimajor axis is the same for all planets.

5 0

3 years ago

A bullet is shot vertically upward with an initial velocity of 128 ft/s. The bullet's height after t seconds is y(t) = 128t - 16

saul85 [17]

The height of the bullet when the velocity is zero is 256 ft.

<h3>Height of the bullet when the velocity is zero </h3>

The height of the bullet when the velocity is zero is determined by taking derivative of the function as shown below;

$v = \frac{dy}{dt} = 128 -32t \\\\when \ v \ is \ zero\\\\v = 0\\\\128 - 32t = 0\\\\32t = 128\\\\t = \frac{128}{32} \\\\t = 4 \ s$

The height of the bullet at this time is calculated as follows;

$y(4) = 128(4) - 16(4)^2\\\\y(4) = 256 \ ft$

Learn more about height of projectiles here: brainly.com/question/10008919

6 0

3 years ago

George walks to a friend's house. He walks 750 meters North, then realizes he walked

Sauron [17]

Answer:

I think you are looking for the velocity, so the answer is 38.5 m/s

Explanation:

Velocity is giving by displacement/time. North will be positive and South will be negative, George travels 750 meters then travels -250 meters his displacement is then 750 - 250 or 500 meters. Divide that by 13 seconds to get 38.5 m/s.

4 0

3 years ago

The number 14 is the 'mass number'. What does it tell us about this isotope?

Svetradugi [14.3K]

Answer:

This show the most stable of atom of that element

Explanation:

The mass number of a element on the periodic table show the most stable atoms of that element.

4 0

3 years ago