How much of the sky is north of the celestial equator?
a. less than one-half, because of the tilt of the equator to the ecliptic plane
b. more than one-half, because of the precession of the poles
c. exactly one-half
d. all of the night sky
c
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A moving object’s length in a given frame is defined to be the distance between two events that occur at opposite ends of the object and that are simultaneous in that frame. Why is it crucial that the events we use to define a moving object’s length be simultaneous?
A. This is purely conventional: there is no other reason. B. This choice makes it easier to use the Lorentz transformation equations to find the length. C. If the events are not constrained to be simultaneous, then the length is poorly defined: its value would depend on the time interval between the events. D. If the events are simultaneous, then the length will be a frame-independent quantity. E. Other (specify)
While spinning down from 500.0 rpm to rest, a solid uniform flywheel does of work. If the radius of the disk is what is its mass?
A) 5.2 kg B) 4.4 kg C) 6.0 kg D) 6.8 kg
The energy use in a household is different at different times of year
What will be an ideal response?
The energy in the atmospheres of most of the jovian planets comes
A) almost entirely from the Sun. B) almost entirely from their interiors. C) both the Sun and their interiors, in roughly equal proportions. D) tidal heating.