Does Simple Harmonic Motion occur when the force, acting on a mass, is positively proportional to the displacement (F = kx)? Explain
What will be an ideal response?
No. F = kx (k positive) leads to unconstrained motion. One must have the force in opposite direction, F = -kx, to produce SHM.
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The average rate of erosion on the Moon is far less than on Earth because
A) the crust of the Moon is much denser than the Earth's crust. B) the Moon is much younger than the Earth. C) the Moon lacks wind, water and an atmosphere. D) the Moon's magnetic field protects it from the solar wind better than ours does. E) the Moon's mare long ago dried up, so there is no more wave erosion there.
A light ray, traveling parallel to the axis of a thin concave lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquely to the axis of the lens
A) such that it never crosses the axis. B) crossing the axis at a point equal to twice the focal length. C) crossing the axis at a point equal to one-half the focal length. D) passing between the lens and its focal point. E) passing through the focal point.
A laser beam is shown through a grating and the first-order maximum is produced at 
What is the highest order maximum that can be produced by this arrangement?
A. 2 B. 3 C. 4 D. 5 E. 6
The time between the vernal equinox and the autumnal equinox is somewhat greater than the time between the autumnal equinox and the vernal equinox. This is a result of Kepler's ________ law.
A. First B. Second C. Third D. Fourth