The energy released by the Sun is the outcome of atomic nuclei

1) breaking apart,
2) combining together,

and radioactive by-products are a chief result of atomic nuclei
3) breaking apart.
4) combining together.
5) doing neither.


Answer: 2, 3

Physics & Space Science

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All real engines are less efficient than the Carnot engine because

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When a rock is held above the ground, we say it has some gravitational potential energy. When we let it go, it falls and we say the gravitational potential energy is converted to kinetic energy. Finally, the rock hits the ground (and stays there). What has happened to the energy?

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Physics & Space Science

A 60-kg (including the passenger) sled is subject to a net force of 20 N pushing in the direction of the sled's motion as it is moving over a horizontal surface for a distance of 11 m after having started from rest. At this point the sled is released as it starts down a 10.0° incline. However, the snow is not very deep, and the sled stops after having moved an additional 35 m. What is the work

done by friction while the sled is on the incline? a. –3.6E+3 J b. –3.8E+3 J c. –3.4E+3 J d. –2.0E+4 J

Physics & Space Science