A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The power factor, cos ?, is
a. ?1.00.
b. ?0.936.
c. +0.943.
d. +0.936.
e. +1.00.
d
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When resistors are connected in series
A) the same power is dissipated in each one. B) the potential difference across each is the same. C) the current flowing in each is the same. D) the total effective resistance is reduced.
After World War II, the U.S. Government spent two decades investigating UFOs because they
A) were themselves developing new types of aircraft and used the official investigation as a cover-up B) thought that they might be new types of aircraft being developed by the Soviet Union C) knew that UFOs were alien craft and used the official investigation as a cover-up D) were afraid that an alien civilization was in the process of invading the Earth
Where is the Sun located relative to a planet's orbit about it?
a. at the center of the orbit, which is a circle b. at the center of the orbit, which is an ellipse c. at one focus of the ellipse which forms the orbit d. none of the above
Newly formed neutron stars have weak magnetic fields which strengthen over time, due to the conservation of angular momentum
Indicate whether the statement is true or false