A ball drops some distance and gains 30 J of kinetic energy. Do NOT ignore air resistance. How much gravitational potential energy did the ball lose?
A) more than 30 J
B) exactly 30 J
C) less than 30 J
A
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Four students measure the mass of an object, each using a different scale. They record their results as follows:
Student A B C D E Mass (g) 49.06 49 50 49.1 49.061 Which student used the least precise scale? A) A B) B C) C D) D E) E
When you double the number of windings in a solenoid keeping all other parameters (radius, length and current) fixed, the magnetic field at the center of the solenoid will
A) double. B) triple. C) quadruple. D) be reduced to one-fourth as much. E) be reduced to half as much.
A car of mass 1000 kg moves with a speed of 50 m/s on a circular track of radius 100 m. What is the magnitude of its angular momentum (in kg?m2/s) relative to the center of the race track?
A. 5.0 × 102 B. 5.0 × 106 C. 2.5 × 104 D. 2.5 × 106 E. 5.0 × 103
When the speed of your car is doubled, by what factor does its kinetic energy increase?
(a) square root of 2 . (b) 2. (c) 4. (d) 8.