Recall Galileo's Leaning Tower experiment. With negligible air resistance, a heavy and a light object fall
A) with equal accelerations.
B) with the same increases in speed.
C) to the ground in equal times.
D) all of the above
Answer: D
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If a certain object emits visible waves rather than infrared waves its temperature is
A) higher. B) lower. C) the same, temperature doesn't make any difference.
A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?
A. 5.0 N B. 3.8 N C. 4.2 N D. 4.6 N E. 6.5 N
A 400-g piece of metal at 120°C is dropped into a cup containing 450 g of water at 15.0°C. The final temperature of the system is 40.0°C. What is the specific heat of the metal, assuming no heat is exchanged with the surroundings or the cup?
A) 1470 J/(kg?K) B) 2830 J/(kg?K) C) 3420 J/(kg?K) D) 3780 J/(kg?K) E) 4280 J/(kg?K)
Briefly describe the Sun's 22 year activity cycle
What will be an ideal response?