You throw a ball straight up, it peaks out, and then comes back down to you. During this motion, the velocity and acceleration
a. always point in the same direction
b. always point opposite to each other
c. sometimes point in the same direction, and other times point opposite to each other
d. depend on the way the ball is thrown
e. depend on the mass of the ball
C
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Power: A typical incandescent light bulb consumes 75 W of power and has a mass of 30 g. You want to save electrical energy by dropping the bulb from a height great enough so that the kinetic energy of the bulb when it reaches the floor will be the same as the energy it took to keep the bulb on for 1.0 hour. From what height should you drop the bulb, assuming no air resistance and constant g?
Fill in the blank(s) with the appropriate word(s).
Which planets have densities similar to that of Earth's?
A. Uranus and Neptune B. Mars and Mercury C. Pluto and Charon D. Jupiter and Saturn
A girl and her bicycle have a total mass of 40 kg. At the top of the hill her speed is 5.0 m/s. The hill is 10 m high and 100 m long. If the force of friction as she rides down the hill is 20 N, what is her speed at the bottom?
a. 11 m/s b. 17 m/s c. 24 m/s d. 27 m/s
A Carnot refrigerator has a coefficient of performance = 2.5. The refrigerator consumes 50 W of power. How much heat is removed from the interior of the refrigerator in 1 hour?
A) 7.5 kJ B) 4.5 × 105 J C) 1.8 × 105 J D) 7.2 × 105 J E) 72 kJ