Which of the following best describes the Tropic of Cancer?
A) It is the circle of latitude on Earth for which the Sun appears directly overhead at noon on the June solstice.
B) It is the circle of latitude on Earth for which the Sun appears to remain above the horizon for a full 24 hours on the June solstice.
C) It is the circle of latitude on Earth for which the Sun appears directly overhead at noon on the March and September equinoxes.
D) It is the line of right ascension passing through the constellation of Cancer.
A) It is the circle of latitude on Earth for which the Sun appears directly overhead at noon on the June solstice.
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What fundamental fact underlies the operation of essentially all electric motors?
A) Iron is the only element that is magnetic. B) A current-carrying conductor placed perpendicular to a magnetic field will experience a force. C) Opposite electric charges attract and like charges repel. D) A magnetic North pole carries a positive electric charge, and a magnetic South pole carries a negative electric charge. E) Alternating current and direct current are both capable of doing work.
A bicycle whose wheels have a radius of 66 cm is traveling at 2.0 m/s. If the wheels do not slip, what is the angular speed of the wheels?
What will be an ideal response?
A pendulum is released from rest at position A and swings toward the vertical under the influence of gravity as depicted below
The Earth moves about the Sun in an elliptical orbit. As the Earth moves closer to the Sun, which of the following best describes the Earth-Sun system's moment of inertia?
a. decreases c. remains constant b. increases d. None of the above choices are valid.