Calculate the minimum average power output necessary for a person to run up a 12.0 m long hillside, which is inclined at 25.0° above the horizontal, in 3.00 s. You can neglect the person's kinetic energy
Express your answer in horsepower. (1 hp = 746 W)
A) 1.24 hp
B) 2.93 hp
C) 1.86 hp
D) 0.740 hp
Answer: A
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Which of the following places is not generally considered a potential home for life in our solar system?
A) Jupiter's atmosphere B) Mars C) Europa D) Titan
This graph shows how the time dilation factor (t?/t) depends on the speed of an object moving by you. How fast does an object have to be moving for you to see its time running about 20% slower than normal (about 80% of normal)?
A) 0.6c B) 0.2c C) 0.8c D) None of the choices are correct; time must be the same for everyone.
Consider two cylinders of gas identical in all respects except that one contains O2 and the other He. Both hold the same volume of gas at STP and are closed by a movable piston at one end
Both gases are now compressed adiabatically to one-third their original volume. Which gas will show the greater temperature increase? A) the O2 B) the He C) Neither; both will show the same increase. D) It's impossible to tell from the information given.
Wine made from fossil fuels is not radioactive because
A. the radioactivity has decayed away B. there is no carbon in such wine C. ancient plants never were radioactive D. the half-life of the key elements is too long