Temperature is most closely related to molecular
A) kinetic energy.
B) potential energy.
C) electrical energy.
D) mechanical energy in general.
Answer: A
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The speed of FM waves will be observed to be c = 2.9979 × 108 m/s when the antenna emitting the waves is
A. at rest relative to the receiving antenna. B. moving to the right of the detecting antenna at 0.5c. C. moving to the left of the detecting antenna at 0.5c. D. moving as described in (a), (b) or (c) above. E. moving at 2.9979 × 108 m/s.
In an isovolumetric process where the pressure increases, are the heat absorbed, work done by the system, and the change in internal energy of the system positive, negative, or zero?
a. Q is +, W is +, and ?U is +. b. Q is +, W is ?, and ?U is 0. c. Q is +, W is 0, and ?U is +. d. Q is ?, W is 0, and ?U is ?.
The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 4, when its life track moves straight down to join the main sequence?
A) Its surface temperature and luminosity increase. B) Its surface temperature increases, and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases, and its luminosity increases. E) Its surface temperature and luminosity remain the same.
The figure shows a ‘snapshot’ of four different waves in identical ropes stretched with the same force
The wave where the speed is greatest is
a.
I.
b.
II.
c.
III.
d.
IV.
e.
all of the above.