How is the refractive power, P, of a lens related to its focal length, f?
A. P = f
B. P = 1/f
C. P = 2*f
D. P = f2
Ans: B. P = 1/f
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In a Maxwell solid, when a stress is applied at t=0, the total strain is equal to the _________strain.
Fill in the blank(s) with the appropriate word(s).
A particle (m = 20 mg, q = ?5.0 ?C) moves in a uniform electric field of 60 N/C in the positive x direction. At t = 0, the particle is moving 25 m/s in the positive x direction and is passing through the origin. How far is the particle from the origin at t = 2.0 s?
A. 80 m B. 20 m C. 58 m D. 10 m E. 30 m
A white dwarf supernova event is very important to calibrating Hubble's Law. Why? Choose the best answer for the question
A) It is a very luminous standard candle. B) It is a very rare event. C) It can only happen to white dwarfs. D) The white dwarf supernova in a galaxy tells us how fast a galaxy is expanding away from us.
Glaciers lose mass by
A) crevassing. B) calving. C) melting and calving. D) melting and crevassing.