Why can't the Moon always pass through the center of the umbra?
a. The Moon's rotation is slightly faster than its revolution around Earth.
b. The Moon's orbit is inclined by 5 degrees to the plane of Earth's orbit.
c. The Moon's synodic cycle changes a few minutes per cycle
d. The Moon's orbit changes with the seasons.
e. The Moon is not in its full moon lunar phase.
b
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A. 600 Hz B. 360 Hz C. 240 Hz D. 120 Hz
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What will be an ideal response?
Virgil rides a skateboard (combined mass 100 kg) at 4 m/s, and Jill rides a bicycle (combined mass 64 kg) at 5 m/s.
A. Jill has the greater kinetic energy. B. Virgil and Jill have equal kinetic energies. C. Virgil has the greater kinetic energy.
A photovoltaic cell receives energy input primarily by
A) conduction. B) convection. C) radiation. D) all of the above