A jumper in the long-jump goes into the jump with a speed of 12 m/s at an angle of 20° above the horizontal. How long is the jumper in the air before returning to the Earth?
A) 0.21 s
B) 0.42 s
C) 0.84 s
D) 1.3 s
E) 1.6 s
C
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A boy on board a cruise ship drops a 30.0 g marble into the ocean. If the resistive force proportionality constant is 0.500 kg/s, what is the terminal speed of the marble in m/s?
a. 0.147 b. 0.294 c. 0.588 d. 1.18 e. 2.35
Energy Conservation With Nonconservative Forces: A 60-kg skier starts from rest from the top of a 50-m high slope. If the work done by friction is -6.0 kJ, what is the speed of the skier on reaching the bottom of the slope?
A. 17 m/s B. 24 m/s C. 28 m/s D. 31 m/s
When you pay the electric company by the kilowatt-hour, what are you actually paying for?
a) energy b) power c) current d) voltage e) none of the above
A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the average kinetic energy per molecule is
A. 6.7 × 10?20 J. B. 1.0 × 10?21 J. C. 1.0 × 10?20 J. D. 6.7 × 10?21 J. E. 1.3 × 10?20 J.