The center of gravity is a useful point at which to balance an object. For instance, a ruler can be balanced by placing its center on your finger. Is it possible for the center of gravity of an object to be located at a point where no material exists to balance the object?
1.no, never
2.only for very unsymmetrical objects
3.It is possible in theory, but no objects have been found for which this occurs.
4.Yes, it is possible.
4
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If the Moon is setting at noon, the phase of the Moon must be
A) full. B) first quarter. C) third quarter. D) waning crescent. E) waxing crescent.
Electromagnetic waves are generated whenever the ____
a. motion of any particle is changed
b. motion of any charged particle changes
c. motion of a positively charged particle is changed
d. motion of a negatively charged particle is changed
e. acceleration of any charged particle is changed
All the statements below are true. Which one gives the primary reason why the surface of Venus today is some 450°C hotter than the surface of Earth?
A) Venus has a much stronger greenhouse effect than Earth. B) Venus is only about 73% as far from the Sun as Earth. C) Venus has a much higher reflectivity than Earth. D) Venus has a higher atmospheric pressure than Earth.
A 60-kg skier pushes off the top of a frictionless hill with an initial speed of 4.0 m/s. How fast will she be moving after dropping 10 m in elevation? Air resistance is negligible
A) 10 m/s B) 15 m/s C) 0.15 km/s D) 0.20 km/s E) 49 m/s