Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the force 
the floor exerts on the first person to the force 
the rope exerts on the second person. Which statement is correct?
A.
B.
C.
is greater than , but they have the same direction.D.
is greater than , but they have opposite directions.E.
is less than , but they have the same direction.Answer: B
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A projectile is fired directly upwards at 49.4 m/s. A second projectile is dropped from rest at some higher elevation at the instant the first projectile is fired and passes the first projectile 3.00 s later. From the frame of reference of the first projectile, what is the velocity of the second projectile as it passes by?
a. 64.1 m/s, downward b. 71.5 m/s, downward c. 49.4 m/s, downward d. 34.7 m/s, downward e. 104 m/s, downward
Which of the following is an almost reversible process?
A. The explosion of hydrogen and oxygen to form water. B. Heat transfer through thick insulation. C. The adiabatic free expansion of a gas. D. A slow isothermal compression of a gas. E. A slow leakage of gas into an empty chamber through a small hole in a membrane.
If the ac peak current through a 100 ohm resistor is 1.7 A, the average power dissipated by the resistance is
A) 85 W. B) 170 W. C) 289 W. D) 220 W. E) 145 W.
Two lamps, a thick-filament one and a thin-filament one, are connected in series to a battery. The current is greater in the lamp with the
A) thick filament. B) thin filament. C) same in each