A child is standing at the rim of a freely rotating disk holding a rock. The disk rotates without friction. The rock is dropped at the instant shown. As a result of dropping the rock, what happens to the angular velocity of the child and disk?
2
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A v-t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 6 s the acceleration of the ball is zero. We know that at t = 6 s,
a. the slope of the curve is non-zero. c. the velocity of the ball is not changing. b. the curve is not crossing the time axis. d. the curve is at v = 0, t = 0.
What is the current in the 15-? resistor when ? = 9.0 V?
a.
0.20 A
b.
0.30 A
c.
0.10 A
d.
0.26 A
e.
0.60 A
Why are we unlikely to find Earth-like planets around halo stars in the Galaxy?
A) Halo stars formed from gas containing lots of heavy elements and few of the light elements needed to create terrestrial planets like the Earth. B) Halo stars formed from gas containing few heavy elements, the elements needed to create terrestrial planets like the Earth. C) Planets around stars are extremely rare in our Galaxy. D) Halo stars formed directly from gas in the halo without forming a planetary disk. E) Halo stars are all very low mass stars that cannot hold onto planets.
A 7.0-kg bowling ball experiences a net force of 6.0 N. What will be its acceleration?
a. 0.86 m/s2 c. 7.0 m/s2 b. 6.0 m/s2 d. 42 m/s2