A cup full of water and made of plastic feels warmer than one made of glass because
A. plastic is warmed by water
B. plastic conducts heat less than glass
C. plastic conducts heat better than glass
D. plastic dissolves in water
Ans: B. plastic conducts heat less than glass
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Lenz's Law: The wire in the figure carries a steady current I. What is true about the currents induced in each of the three loops shown? The wire and the three loops are all in the same plane.
A. No current is induced in any loop. B. The currents are counterclockwise in all three loops. C. The currents are clockwise in all three loops. D. Loop A has clockwise current, loop B has no induced current, and loop C has counterclockwise current. E. Loop A has counterclockwise current, loop B has no induced current, and loop C has clockwise current.
Nuclear Reactions: The equation shows a fission reaction:
U + 
n ? 
Nb + X + 4 
nWhat is the missing term X in the equation?
A. 
Ag
B. 
Sb
C. 
Sb
D. 
Ag
E. 
Sb
An 800-kHz radio signal is detected at a point 8.5 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.90 V/m
Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the average electromagnetic energy density at that point? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 3.6 pJ/m3 B) 5.1 pJ/m3 C) 7.2 pJ/m3 D) 10 pJ/m3 E) 14 pJ/m3
The law of reflection, as well as the law of refraction, can be derived using Huygens' principle
Indicate whether the statement is true or false