An oil film floats on a water surface. The indices of refraction for water and oil, respectively, are 1.333 and 1.466 . If a ray of light is incident on the air-to-oil surface at an angle of 41.9° with the normal, what is the incident angle at the oil-to-water surface?
a. 30.1°
b. 27.1°
c. 37.4°
d. 41.9°
e. 33.5°
b
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The first atomic explosion released approximately 1.0 × 1014 J of energy. How much matter had to be changed into energy to produce this yield?
A) 1.1 g B) 23 g C) 13 g D) 0.45 kg E) 1.1 kg
Work-Energy Theorem: The kinetic friction force that a horizontal surface exerts on a 60.0-kg object is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?
A. 15.0 m B. 30.0 m C. 375 m D. 750 m
Power
a) is work times time. b) is force divided by time. c) has the same units of energy. d) is work divided by time. •
Harry takes a space voyage and returns to find his twin sister has aged more than he has. This is evidence that
A) she has changed frames of reference. B) he has changed frames of reference. C) both have changed frames of reference. D) neither has changed frames of reference