Energy in the Electric Field: At a distance d from a point charge Q, the energy density in its electric field is u. If we now go to a distance d/2 from the charge, what is the energy density at the new location?
A. 16u
B. 8u
C. 4u
D. 2u
E. u
Answer: A
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Fill in the blank(s) with correct word
What do we mean by the diffraction limit of a telescope?
A) It is the maximum size to which any telescope can be built. B) It describes the farthest distance to which the telescope can see. C) It describes the maximum exposure time for images captured with the telescope. D) It is the best angular resolution the telescope could achieve with perfect optical quality and in the absence of atmospheric distortion.
A ball of mass mB is released from rest and acquires velocity of magnitude vB before hitting the ground. The ratio of the impulse delivered to the Earth to the impulse delivered to the ball is
A.
B.
.C.
.D.
E.
.A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming no air?
A) 9.8 m/s upward B) 9.8 m/s downward C) 0 m/s D) 19.6 m/s downward