Transformers: The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be
A. 50 V.
B. 100 V.
C. 200 V.
D. none of the given answers.
Answer: C
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Water with a density of 1,000 
flows through a 4.00 cm diameter pipe with a velocity of 1.20 m/s. What is the mass flow rate?
A. 1.01 kg/s B. 1.21 kg/s C. 1.32 kg/s D. 1.40 kg/s E. 1.51 kg/s
According to the theory that active galactic nuclei are powered by supermassive black holes, the high luminosity of an active galactic nucleus primarily consists of ________
A) intense radiation emitted by the black hole itself B) light emitted by hot gas in an accretion disk that swirls around the black hole C) the combined light of thousands of young, high-mass stars that orbit the black hole D) radio waves emitted from radio lobes found on either side of the galaxy we see in visible light
Sebastian has drawn a free-body diagram for a ladder of mass m leaning against a frictionless wall. His diagram is shown below. What is his error?
?
?
A.
is in the wrong direction.B.
should be directed upwards, not down.C.
should be perpendicular to the wall, not parallel to it.D.
should be down into the floor for 
to have the given direction.E.
is correct, but there should also be a force perpendicular to the wall.Gravitational Potential Energy: A stone is held at a height h above the ground. A second stone with four times the mass of the first one is held at the same height. The gravitational potential energy of the second stone compared to that of the first stone is
A. one-fourth as much. B. one-half as much. C. twice as much. D. four times as much. E. the same.