Can the total mechanical energy E = KE + PE ever be negative ?
A. Yes, always.
B. Yes, because KE can be negative.
C. Yes, because PE can be negative.
D. No.
C. Yes, because PE can be negative.
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How do we specify the location of a star in the night sky?
Dark matter must be ____
a. baryonic b. non-baryonic c. neutral d. WIMPs e. isochronic
When you step on a weighing scale at noon, Earth pulls you downward and the overhead Sun pulls you upward. The reason the Sun's pull doesn't decrease your weight at noon is because
A) the Sun's pull on you is negligibly small. B) the weighing scale is calibrated only in Earth weight. C) you, the scale, and Earth are in free fall (in orbit) around the Sun. D) the Sun's pull is cancelled by the gravitation of other celestial bodies. E) of tidal effects in the "solid" Earth.
Energy Conservation With Conservative Forces: In the figure, a ball hangs by a very light string. What is the minimum speed of the ball at the bottom of its swing (point B) in order for it to reach point A, which is 1.0 m above the bottom of the swing?
A. 2.2 m/s B. 3.1 m/s C. 4.4 m/s D. 4.9 m/s