A 7.50-kg bowling ball strikes a 5.20-kg pin. The pin flies forward with a velocity of 4.00 m/s; the ball continues forward at 5.50 m/s. What was the original velocity of the ball?
a. 11.3 m/s
b. 8.27 m/s
c. 0.128 m/s
d. 1.34 m/s
e. 4.61 m/s
b
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The planet with the least obvious ring system is ________
Fill in the blank(s) with correct word
The phase angle of a series RL ac circuit with a 20.0-mH inductor and a certain resistor at 1000 Hz is 20.0°. What is the resistance in this circuit?
A) 145 ? B) 200 ? C) 100 ? D) 245 ? E) 345 ?
This image combines a visible-light view of the galaxy Hercules A with an image showing radio wave emission (the reddish colors) in its vicinity. The likely explanation for the two huge clumps of radio emission far to either side of the visible galaxy is
A) the radio emission comes from gas shot out into space by jets powered by a supermassive black hole in the galactic center. B) the radio emission comes from gas that was left behind in the halo when the galaxy collapsed from a protogalactic cloud. C) the radio emission comes from gas pulled out of the galaxy when it collided with another galaxy in the distant past. D) this galaxy must have suffered two collisions in the past, with each collision pulling out gas in one direction.
A star enters the main sequence when ________.
A. it forms planets B. nuclear fuel in its core can supply enough energy to stop its collapse C. it collapses, and its envelope becomes degenerate D. it stops fusing nuclear fuel in its core and starts to expand