When a rocket forces exhaust gases downward, the exhaust gases
A) as the name implies, soon exhaust their influence.
B) play no further role in the motion of the rocket.
C) exert an upward force on the rocket.
Answer: C
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Which of the following is the most similar, in its operation, to a photovoltaic cell?
A) fluorescent light bulb B) geothermal energy C) fossil-fuel electric power plant D) battery E) automobile engine
Suppose a power plant uses a Carnot engine to generate electricity, using the atmosphere at 300 K as the low-temperature reservoir. Suppose the power plant produces 1 × 10^6 J of electricity with the hot reservoir at 500 K during Day One and then produces 1 × 10^6 J of electricity with the hot reservoir at 600 K during Day Two. The thermal pollution was
a. greatest on Day One. b. greatest on Day Two. c. the same on both days. d. zero on both days.
As shown below, a square loop of wire of side a moves through a uniform magnetic field of magnitude B perpendicular to the page at constant velocity
directed to the right. Which statement regarding the electric field induced in the wires is correct for the wires at the left and right sides of the loop?
?
a.
The electric field 
is directed upwards in both the right and left sides of the loop.
b.
The electric field s directed upwards in the right side and downwards in the left side of the loop.
c.
The electric field is directed upwards in the left side and downwards in the right side of the loop.
d.
The electric field is directed downwards in both the right and left sides of the loop.
e.
There is no electric field present in any side of the loop.
The largest single dish radio telescope is ____
a. suspended on cables in a valley b. buried deep in a mine underground c. orbiting in space d. suspended from balloons in the upper atmosphere