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3 years ago

When a star is moving away the light waves appear to be....

Physics

1 answer:

BabaBlast [244]3 years ago

4 0

When a star is moving away from earth it appears blue

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In one word, how do you determine the net force if the forces are in the same direction?

kipiarov [429]

Answer:

Forces Acting in the Same Direction

If two forces act on an object in the same direction, the net force is equal to the sum of the two forces.

Explanation:

4 0

3 years ago

A girl (mass M) standing on the edge of a frictionless merry-go-round (radius R, rotational inertia I) that is not moving. She t

vladimir1956 [14]

a) $\omega=\frac{-mvR}{I+MR^2}$

b) $v=\frac{-mvR^2}{I+MR^2}$

Explanation:

Since there are no external torques acting on the system, the total angular momentum must remain constant.

At the beginning, the merry-go-round and the girl are at rest, so the initial angular momentum is zero:

$L_1=0$

Later, after the girl throws the rock, the angular momentum will be:

$L_2=(I_M+I_g)\omega +L_r$

where:

$I$ is the moment of inertia of the merry-go-round

$I_g=MR^2$ is the moment of inertia of the girl, where

M is the mass of the girl

R is the distance of the girl from the axis of rotation

$\omega$ is the angular speed of the merry-go-round and the girl

$L_r=mvR$ is the angular momentum of the rock, where

m is the mass of the rock

v is its velocity

Since the total angular momentum is conserved,

$L_1=L_2$

So we find:

$0=(I+I_g)\omega +mvR\\\omega=\frac{-mvR}{I+MR^2}$

And the negative sign indicates that the disk rotates in the direction opposite to the motion of the rock.

The linear speed of a body in rotational motion is given by

$v=\omega r$

where

$\omega$ is the angular speed

r is the distance of the body from the axis of rotation

In this problem, for the girl, we have:

$\omega=\frac{-mvR}{I+MR^2}$ is the angular speed

$r=R$ is the distance of the girl from the axis of rotation

Therefore, her linear speed is:

$v=\omega R=\frac{-mvR^2}{I+MR^2}$

5 0

3 years ago

If we could see our own galaxy from 2 million light-years away, it would appear _________.

yaroslaw [1]

Answer:

It would appear as a flattened disk with a central bulge and spiral arms, spanning a few degrees across the sky.

Explanation:

I hope this helps! Have a great day!

Anygays-

5 0

3 years ago

What necessary information is missing from this formula page? W-work F-force x-distance Work = force(distance) W = Fx a. Formula

Nataliya [291]

Answer:

it should be Work = F * d * cos(theta)

Explanation:

Force is mass * acceleration, and displacement is the distance between the starting and ending point.

we need theta because it can be used to calculate work when going up an incline surface. And we tend to use cosine because we are assuming that our motion is primarily in the X direction.

5 0

3 years ago

Which energy drives convection within the ocean

wlad13 [49]

I think its the sun not 100% sure...

5 0

4 years ago

Read 2 more answers