To determine the mass of a car, a student (with a friend at the wheel) pushes the car holding a bathroom scale between himself and the car and carefully maintains a constant reading of 400 N on the scale while the car accelerates on level ground
At the conclusion of the experiment his friend reports that the car accelerated from rest to 14.0 km/hr in 12.0 s. What was the mass of the car? A) 343 kg
B) 1230 kg
C) 2460 kg
D) 3360 kg
E) 3430 kg
B
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What happens when you drop a clock into a black hole?
A. The clock appears to be advancing at its normal rate both from the point of view of an outside observer and from the point of view of an observer falling with the clock. B. The clock appears to be advancing rapidly from the point of view of an outside observer, but normally for an observer falling with the clock. C. The clock appears to be advancing slowly from the point of view of an outside observer, but normally for an observer falling with the clock. D. The clock appears to be advancing slowly both from the point of view of an outside observer and from the point of view of an observer falling with the clock. E. The clock appears to be advancing rapidly both from the point of view of an outside observer and from the point of view of an observer falling with the clock.
To pluck a nucleon from a nucleus requires
A) work. B) kinetic energy. C) potential energy. D) none of the above
A diver shines light up to the surface of a smooth pond at a 10° angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of
A) less than 10°. B) 10°. C) more than 10°.
Four unequal resistors are connected in a parallel with each other. Which one of the following statements is correct about this combination?
A) The equivalent resistance is less than that of the smallest resistor. B) The equivalent resistance is equal to the average of the four resistances. C) The equivalent resistance is midway between the largest and smallest resistance. D) The equivalent resistance is more than the largest resistance. E) None of the other choices is correct.