A man is holding an 8.00-kg vacuum cleaner at arm's length, a distance of 0.550 m from his shoulder. What is the torque on the shoulder joint if the arm is horizontal?
A)
0.242 Nm
B)
4.40 Nm
C)
43.2 Nm
D)
14.5 Nm
E)
0 Nm
C
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The numerous craters we see on the solid surfaces of so many Solar System bodies are evidence that ________.
A. they were bombarded in their youth by many solid objects B. these bodies were originally a mix of water and rock. As the young Sun heated up, the water boiled, creating hollow pockets in the rock C. the Sun was so hot that it melted all these bodies and made them boil D. they were so hot in their youth that volcanoes were widespread E. all the planets were once part of a single, very large and volcanically active mass that subsequently broke into many smaller pieces
A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse it has received from the gravitational force is
a. 9.80 Ns. b. 19.6 Ns. c. 29.4 Ns. d. 58.8 Ns. e. 118 Ns.
Time Dilation: You are a passenger on a spaceship. As the speed of the spaceship increases, you will observe
A. your watch slowing down. B. your watch speeding up. C. your watch losing time. D. your watch gaining time. E. nothing unusual about the behavior of your watch.
A bar magnet is dropped, N pole down, so it falls through a horizontal loop of wire. As it leaves the loop, the induced current (viewed from above) is:
A) clockwise B) counterclockwise C) zero