It is found that at a laser bounced off the surface of a liquefied gas is perfectly polarized when the angle of incidence of the laser beam is 45.7 degrees from the vertical. What is the index of refraction of this material?
A. 1.43
B. 1.397
C. 1.412
D. 1.091
E. 1.025
E. 1.025
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Rotational Kinetic Energy: A small ball is tied to one end of a light 2.5-m wire, and the other end of the wire is hooked to the ceiling. A person pulls the ball to the side until the wire makes an angle of 35° with the plane of the ceiling and then gently releases it. What is the angular speed of the ball, in rad/s, as it swings through its lowest point?
Fill in the blank(s) with the appropriate word(s).
A 1-kg ball dropped from 2 m rebounds only 1.5 m after hitting the ground. The amount of energy converted to heat is about
A) 0.5 J. B) 1.0 J. C) 1.5 J. D) 2.0 J. E) more than 2.0 J.
Suppose we place a 100-g aluminum block with an initial temperature of 100°C in a Styrofoam cup containing a 100-g sample of water at 0°C. (The specific heats of aluminum and water are 900 J·kg-1K-1 and 4200 J·kg-1K-1, respectively.) The system’s final temperature is closest to
A. 0°C. B. 20°C. C. 50°C. D. 80°C. E. 100°C.
According to the law of reflection of light, the angle of incidence is
A) equal to the angle of reflection. B) smaller than the angle of reflection. C) greater than the angle of reflection.