Is it possible for an object moving around a circular path to have both centripetal and tangential acceleration?
A)
No, because then the path would not be a circle.
B)
No, an object can only have one or the other at any given time.
C)
Yes, this is possible if the speed is constant.
D)
Yes, this is possible if the speed is changing.
D
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Gamma ray bursts _____
a. last minutes to hours b. are detected primarily in the disk of the galaxy c. occur without warning d. are not associated with any observable event e. are detected only a few times per year
How does the prevailing model for activity explain the hot ejected gas seen in active galaxies?
A. It is energy released as matter is funneled into a black hole. B. It is gas evaporating from an accretion disk around a massive black hole. C. It is shot out of a black hole. D. It is material trapped between two orbiting black holes being gravitationally scattered. E. It is a rip in space-time from which Hawking radiation is released.
A 1-kg rock that weighs 10 N is thrown straight upward at 20 m/s. Neglecting air resistance, the net force that acts on it when it is half way to the top of its path is
A) less than 10 N. B) 10 N. C) more than 10 N.
At what temperature is the Celsius scale reading equal to twice the Fahrenheit scale reading?
a. ?12.3°F b. ?24.6°F c. ?12.3°C d. ?6.1°C e. ?20°F