A ball is projected upward at time t = 0 s, from a point on a flat roof 10 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground
The initial velocity of the ball is Consider all quantities as positive in the upward direction. At time the vertical velocity of the ball is closest to A) 0 m/s.
B) +175 m/s.
C) +12 m/s.
D) -175 m/s.
E) -12 m/s.
A
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Why is it thought that quasars probably spend only a fairly short time in their highly luminous phase?
A) because there aren't many quasars around today B) because there aren't any quasars closer than about a redshift of 1 C) because all quasars are at about the same epoch, narrowly defined in time D) because a black hole could not power a highly luminous quasar for more than a few million years E) because quasars are known to be the consumers of massive galaxies
A 2.0 kg mass is attached to the end of a horizontal spring (k = 50. N/m) and set into simple harmonic motion with an amplitude of 10. cm. What is the total mechanical energy of this system?
A) 0.02 J B) 25 J C) 0.25 J D) 1.00 J E) 2.5 J
Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. The safe speed (for which no friction is needed to stay on the run) for the smaller radius curve is v
What is the safe speed on the larger-radius curve? A) v / B) 2v C) v D) v/2