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
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What evidence do we have that Earth has a molten core?
What will be an ideal response?
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?
A) The rock keeps the energy inside it in the form of mass-energy. B) The energy goes into the ground and, as a result, the orbit of Earth about the Sun is slightly changed. C) It is transformed back into gravitational potential energy. D) The energy goes to producing sound and to heating the ground, rock, and surrounding air.
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
All real engines are less efficient than the Carnot engine because
a. they do not operate through the Otto cycle. b. they do not operate through a reversible cycle. c. the working substance does not maintain a constant volume through the cycle. d. the working substance does not maintain a constant pressure through the cycle. e. the working substance does not maintain a constant temperature through the cycle.