If 500 electrons are placed on a conducting sphere of radius 10
m, what is the potential at its surface?
A. 100 V
B. -10,000 V
C. 32 V
D. -72 mV
E. -72 V
D. -72 mV
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A 4.00 kg object is moving at 3.00 m/s WEST. It strikes a 6.00 kg that is moving WEST at 2.00 m/s. The objects have a one-dimensional elastic collision in the EAST-WEST direction. The velocity of the 4.00 kg object after the collision is
A. 1.00 m/s WEST. B. 2.80 m/s EAST. C. 1.80 m/s WEST. D. 2.80 m/s WEST. E. 1.80 m/s EAST.
Which two quantities need to be measured in order to determine the density of a planet?
A) mass B) atmospheric composition C) radius D) A and B E) A and C
An LCR circuit has resistance R0, inductance L0, and capacitance C0 . If the resistance value is now tripled, which values of inductance and capacitance will result in the same resonant frequency as before?
a. 3L0, C0 b. L0/3, C0/3 c. 3L0, 3C0 d. 3L0, C0/3
An umbrella has a tendency to move upward when it is windy principally because
1) moving air over the curved surface produces reduced pressure against its top. 2) air moves up into the "bowl" and pushes upward with increased pressure. 3) buoyancy increases with increasing wind speed. 4) the umbrella is simply pushed upward by the wind. This effect was first accurately described by 5) Galileo. 6) Newton. 7) Bernoulli. 8) Einstein. 9) Archimedes.