As compared to Jack, Jill does twice the work in half the time. Jill's power output is
A) the same as Jack's power output.
B) one-fourth as much as Jack's power output.
C) one-half as much as Jack's power output.
D) twice Jack's power output.
E) four times Jack's power output.
E
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Apparent retrograde motion occurs when a planet appears to
A) be stationary with respect to background stars B) move eastward with respect to background stars C) move due north with respect to background stars D) move westward with respect to background stars
When we say that an electromagnetic field is "quantized," we mean that
A) whenever it interacts with atoms, it must deposit an entire "quantum" of energy at each interaction. B) its energy is "digitized" to have either 0, 1, 2, 3, etc. units of a basic energy increment. C) it impacts a viewing screen as tiny bundles of radiation. D) All of the above. E) None of the above.
An object of mass m is attached to string of length L. When it is released from point A, the object oscillates between points A and B. Which statement about the system consisting of the pendulum and the Earth is correct?
a.
The gravitational potential energy of the system is greatest at A and B.
b.
The kinetic energy of mass m is greatest at point O.
c.
The greatest rate of change of momentum occurs at A and B.
d.
All of the above are correct.
e.
Only (a) and (b) above are correct.
The James Webb Space Telescope is designed primarily to observe
A. light of all wavelengths B. gamma rays C. X-rays D. infrared light E. visible light