A beam of unpolarized light in air strikes a flat piece of glass at an angle of incidence of 50.6°. If the reflected beam is completely polarized, what is the index of refraction of the glass?
a. 1.48
b. 1.22
c. 1.57
d. 1.16
e. 1.78
b
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Electromagnetic radiation:
A) can only travel in a dense medium. B) has only the properties of waves. C) can behave both as a wave and as a particle. D) is the same as a sound wave. E) has nothing in common with radio waves.
The specific heat of steam is 2,020 J/kg K in the mks system of units. What is the value of the specific heat of steam in cal/gm 
?
A. 1.000 B. 0.8765 C. 0.6812 D. 0.4826 E. 0.2563
Spike claims that dimensional analysis shows that the correct expression for change in velocity, 
, is 
, where m is mass, t is time, and F is the magnitude of force. Carla says that can't be true because the dimensions of force are 
data-wiris-created="true" class="Wirisformula" align="middle" />. Which one, if either, is correct? A.
.B.
.C.
.D.
.E.
.Energy Conservation With Nonconservative Forces: If a stone is dropped with an initial gravitational potential energy of 100 J but reaches the ground with a kinetic energy of only 75 J, this is a violation of the principle of conservation of energy.
A. True B. False