A layer of ethyl alcohol (n = 1.361) is on top of water (n = 1.333). To the nearest degree, at what angle relative to the normal to the interface of the two liquids is light totally reflected?
a. 78°
b. 88°
c. 68°
d. 49°
e. the critical angle is undefined
A
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I use a rope 1.00-m-long to swing a 1.00-kg weight around my head. The tension in the rope is 20.0 N. In half a revolution how much work is done by the rope on the weight?
a. 20.0 J
b. 31.4 J
c. 123 J
d. 0
A 2.00-kg mass oscillates on the end of a spring with spring constant 12.0 N/m
Its amplitude of oscillation decreases from 10.0 cm to 1.0 cm in 2.00 s. What is the angular frequency at which this oscillator will have its peak amplitude? A) 7.28 s-1 B) 0.622 s-1 C) 2.45 s-1 D) 2.16 s-1 E) 0.311 s-1
If one object has a large redshift and another object has a small redshift, what can we conclude about these two objects?
A) The one with the large redshift is moving toward us faster than the one with the small redshift. B) The one with the large redshift is moving away from us, and the one with the small redshift is moving toward us. C) The one with the large redshift is moving away from us faster than the one with the small redshift. D) The one with the large redshift is hotter and therefore is putting out more radiation. E) The one with the large redshift is redder in color than the other one.
A pion has a mean lifetime of 25 ns in its own rest frame. A beam of pions traveling through the laboratory at a speed of 0.60 c is measured to have a mean lifetime of
A. 21 ?s. B. 21 ns. C. 31 ns. D. 31 ?s.