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sweet-ann [11.9K]
3 years ago
14

Measurements show a certain star has a very high luminosity (100,000 x the Sun's) while its temperature is quite cool (3500 K).

How can this be
Physics
1 answer:
Julli [10]3 years ago
5 0

 

what are the answer choices

Explanation:

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I need 1, 2 and 3 <br><br> Please help!
svetoff [14.1K]

1)Kenetic Energy is defined as energy which a body possesses by virtue of being in motion. 2)KE) is KE = 0.5 x mv2. Here m stands for mass, the measure of how much matter is in an object, and v stands for the velocity of the object, or the rate at which the object changes its position..

And I hope this helped :)

7 0
3 years ago
A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per second is located 0.20 m from the axis of
Margarita [4]

Answer:

197.2 m/s^2

Explanation:

The centripetal acceleration of a point moving by circular motion is given by:

a=\omega^2 r

where

\omega is the angular velocity

r is the distance from the axis of rotation

The point on the wheel makes 5.0 revolutions per second, so the frequency is

f=\frac{5}{1}=5 Hz

and the angular velocity is

\omega=2\pi f = 2\pi (5)=31.4 rad/s

While the distance of the point from the axis of rotation is

r=0.20 m

Substituting, we find the acceleration:

a=(31.4)^2(0.20)=197.2 m/s^2

5 0
3 years ago
Read 2 more answers
What causes convection currents, and what do they do?
frez [133]

Answer:

Convection currents are the result of different heating. Lighter material (warm) rises while heavier (cold) material sinks. This movement of the materials is what causes convection currents! (BTW, it happens in water, in the atmosphere, and in the mantle of Earth!

Explanation:

I hope this helps a little! :)

6 0
4 years ago
How much Kinetic Energy does a 1.5 kg book at rest on top of a 2.3 m tall desk have?
anygoal [31]

A book falls off of a \displaystyle 2.2m high    table. If the book weighs \displaystyle 0.75kg, what will its    final velocity be right before it hits the ground?

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3 years ago
A plastic rod is rubbed with a cloth and becomes positively charged. After charging, the rod is held close to the suspended tabl
12345 [234]
Charges on the metal painted table-tennis ball gain charges from the positively charged rod and becomes positively charged
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