A man in a gym is holding an 8.0-kg weight at arm's length, a distance of 0.55 m from his shoulder joint. What is the torque about his shoulder joint due to the weight if his arm is held at 30° below the horizontal?
A) 22 N ? m
B) 2.2 N ? m
C) 4.4 N ? m
D) 13 N ? m
E) 37 N ? m
E
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A girl is sitting on the edge of a pier with her legs dangling over the water. Her soles are 80.0 cm above the surface of the water. A boy in the water looks up at her feet and wants to touch them with a reed. (nwater = 1.333.) He will see her soles as being
A. right at the water surface. B. 53.3 cm above the water surface. C. exactly 80.0 cm above the water surface. D. 107 cm above the water surface. E. an infinite distance above the water surface.
If the ac peak voltage across a 100-ohm resistor is 120 V, then the average power dissipated by the resistor is
A) 102 W. B) 288 W. C) 72 W. D) 144 W. E) 220 W.
A 7.0-? resistor is connected across the terminals of a battery having an internal emf of 10 V. If there is a 0.50-A current through the circuit, what is the internal resistance of the battery?
A) 13 ? B) 20 ? C) 10.8 ? D) 27.0 ?
A1-N electrostatic force is exerted on each of the two point charges when they are 2 cm apart. If they are moved to a new separation of 8 cm, what is the magnitude of the electric force exerted on each of them?
A) 2 N B) 1/2 N C) 1/4 N D) 1/8 N E) 1/16 N