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3 years ago

Help please, will give brainlist!

Physics

1 answer:

hoa [83]3 years ago

4 0

The answer is c because 80 is less air movement

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How are energy, work ang power related?

jolli1 [7]

Answer:

Work is the change in energy and power is the rate of doing work.

5 0

3 years ago

While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. Her friend, a hocke

sukhopar [10]

Answer:

Right shoe

Explanation:

Let the mass and velocity of incoming puck be m and v respectively.

Momentum of the colliding puck will be mv

In case of first case , the momentum of puck becomes zero so change in momentum after collision with left shoe

= mv - 0 = mv

If time duration of collision be t

rate of change of momentum

= mv / t

This is the force exerted by puck on the left shoe .

Now let us consider collision with right shoe

momentum after collision with right shoe

- mv

change in momentum

= mv - ( - mv ) = 2mv

If time duration of collision be t

rate of change of momentum

= 2mv / t

This is the force exerted by puck on the right shoe .

Since the force on the right shoe is more , this shoe will have greater speed

after collision.

6 0

3 years ago

To understand the relationships between the parameters that characterize a wave. It is of fundamental importance in many areas o

Monica [59]

Answer:

1) c.

2) a.)

Explanation:

At any wave, if its waveform repeats itself every time interval T, it is said that the wave is periodic, with a period T, which is the time needed to complete an entire cycle. The other options refer at the way in the waves propagates (longitudinal or transversal) and to the type of waveform (sinusoidal), so the right answer is c).

At any wave that propagates at a constant speed, there exists a fixed relationship between the velocity v, the frequency f and the wavelength λ, as follows:

$v = \lambda * f (1)$

So in order to v keep constant, if the frequency is increased, the wavelength will decrease in the same proportion, so a) is the right answer.

7 0

3 years ago

What three characteristics do geologist look for when observing a rock sample

lord [1]

Texture hardness and color

5 0

3 years ago

Read 2 more answers

A car is traveling at 20 m/s and a dog runs out in front

Pani-rosa [81]

Answer:

Below

Explanation:

To find the acceleration of the car you can use this formula and rearrange :

vf = vi + at

We know that our time is 2 seconds, our initial velocity, vi, is 20 m/s, and our final velocity vf is 0 because the car comes to a stop before hitting the dog.

So we can just go ahead and plug in these values into the equation above :

0m/s = 20m/s + (a)(2s)

-20m/s = 2s(a)

Divide both sides by 2

-10m/s^2 = a

Therefore the acceleration of the car is -10m/s^2 [forward]

You could also write this as 10m/s^2 [back]

Hope this helps! Best of luck <3

8 0

3 years ago