Which of the following statements about the Moon is correct?
A. The Moon has a constant velocity.
B. There is no net force acting on the Moon.
C. Earth exerts a stronger force on the Moon than the Moon exerts on Earth.
D. The Moon experiences a centripetal acceleration toward Earth.
Answer: D. The Moon experiences a centripetal acceleration toward Earth.
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Latent Heats: The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900 J/kg ? K. If 300 kJ of heat are added to 442 g of aluminum at 100°C, what is the final state of the system? That is, how much is liquid, how much is solid, and what is its temperature?
What will be an ideal response?
The gravitational field simulated by rotation in a space habitat that is best suited for humans is
A) zero. B) g. C) one-quarter g. D) one-half g. E) three-quarters g.
Which of the fundamental interactions governs the following decay? 
A. Weak nuclear B. Electromagnetic C. Gravitational D. Strong nuclear
Two lenses, the first with focal length 10.0 cm and the second with focal length -12.5 cm, are separated by 20.0 cm. An object, 2.40 cm tall, is 15.0 cm in front of the first lens. Where is the final image?
A. 20.0 cm after the second lens B. 12.5 cm after the second lens C. 5.60 cm after the second lens D. 50.0 cm after the second lens E. 100 cm after the second lens