What charge appears on the plates of a 6.0-?F capacitor when it is charged to 40 V?
A)
60 ?C
B)
120 ?C
C)
180 ?C
D)
240 ?C
E)
350?C
D
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A person's eye lens is 2.7 cm away from the retina. This lens has a near point of 25 cm and a far point at infinity
(a) What must the focal length of this lens be in order for an object placed at the near point of the eye to focus on the retina? (b) What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?
Photoelectric Effect: A blue laser beam is incident on a metallic surface, causing electrons to be ejected from the metal. If the frequency of the laser beam is increased while the intensity of the beam is held fixed,
A. the rate of ejected electrons will decrease and their maximum kinetic energy will increase. B. the rate of ejected electrons will remain the same but their maximum kinetic energy will increase. C. the rate of ejected electrons will increase and their maximum kinetic energy will increase. D. the rate of ejected electrons will remain the same but their maximum kinetic energy will decrease.
A block of mass M slides down a frictionless plane inclined at an angle ? with the horizontal. The normal reaction force exerted by the plane on the block is
A) Mg sin ?. B) zero, since the plane is frictionless. C) Mg cos ?. D) Mg. E) Mg tan ?.
As you make a right-hand turn in your car, you are pushed against the door to your left.pushed against the door to your left. This is because
A. the centrifugal force pushed you to the left. B. no force pushed you to the right.