How much kinetic energy does a 0.30-kg stone have if it is thrown at
A) 290 J
B) 580 J
C) 440 J
D) 510 J
A
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The first postulate of special relativity states that ____
a. observers can always detect their uniform motion relative to other objects b. observers can never detect their uniform motion except relative to other objects c. the speed of light is constant regardless of location d. the speed of light in a vacuum is constant e. energy equals mass multiplied by the speed of light, squared
When a 2.75-kg fan, having blades 18.5 cm long, is turned off, its angular speed decreases uniformly from 10.0 rad/s to 6.30 rad/s in 5.00 s
(a) What is the magnitude of the angular acceleration of the fan? (b) Through what angle (in degrees) does it turn while it is slowing down during the 5.00 s? (c) If its angular acceleration does not change, how long after it is turned off does it take the fan to stop.
A golf ball hits a wall and bounces back at 3/4 the original speed. What part of the original kinetic energy of the ball did it lose in the collision?
a. 1/4 c. 7/16 b. 3/8 d. 9/16
The best explanation for the activity at the center of the galaxy is a(n) ____
a. supercluster of O and B stars b. black hole with a mass several thousand times the Sun's c. giant atomic hydrogen cloud energized into a single, massive emission nebula d. black hole with a mass several million times the Sun's e. exotic object known as a "magnetar"