Which one of the following scientists made the theoretical prediction that electromagnetic waves travel through a vacuum at the speed of light?
a. Hertz
b. Faraday
c. Maxwell
d. Lenz
c
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Suppose we know the value of 
for a simple harmonic oscillator. What further information do we need to know to fix the amplitude A and the initial phase ? in the solution to the simple harmonic oscillator equation? (If more than one item is needed, feel free to indicate more than one answer.)
A. The oscillating object’s initial position B. The oscillating object’s initial velocity C. The object’s mass D. The oscillation’s period E. The spring’s spring constant F. We do not need additional information. G. The oscillating object’s initial(position+velocity)
An auto moves at a steady 50 mph down a straight level road. The net force on the auto is
A) downward. B) forward. C) sideways. D) zero. E) backward.
The position of a 0.64-kg mass undergoing simple harmonic motion is given by x = (0.120 m) cos (pt/16). What is the maximum net force on the mass as it oscillates?
a. 0.98 × 10^-3 N c. 3.0 × 10^-3 N b. 7.4 × 10^-3 N d. 4.7 N
A worker in a warehouse uses a rope passing through some pulleys to lift a heavy crate. The worker exerts a force five times less than the weight of the crate but has to move the rope four times as far as the crate moves. This situation
A. can happen because the extra distance traveled makes up for the smaller force applied. B. cannot happen because a crate that heavy would lift the worker, rather than the worker lifting the crate. C. can happen because there is friction in the pulleys so the work done by the worker will not equal the work done on the crate. D. cannot happen because the work done by the worker is less than the work done on the crate.