A force field is induced in any region of space in which
A) an electric field changes with time.
B) a magnetic field changes with time.
C) both of these
D) neither of these
Answer: C
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A generator has 200 turns of wire on a coil of radius 2.00 cm. What rotational speed is necessary to produce an emf of amplitude 4.50 V if the magnetic field in the region of the coil is 0.180 T?
A. 60.0 rad/s B. 16.0 rpm C. 100 rpm D. 500 rpm E. 950 rpm
The sun moves
a. about one degree westward each day. b. about one degree eastward each day. c. about 360 degrees westward each day. d. about 360 degrees eastward each day. e. along the celestial equator.
A 500-W heater carries a current of 4.0 A. How much does it cost to operate the heater for 30 min if electrical energy costs 6.0 cents per kWh?
a. 1.5 cents b. 9 cents c. 6.0 cents d. 0.042 cents e. 30 cents
Why does Michael Jordan appear to defy gravity as he slam dunks the ball? (After you have thought about this question, see page 68 of your textbook.)
a. He is an extraordinary athlete who is able to jump much higher than most humans. b. His motion is that of a projectile, and a projectile's motion is such that its vertical speed is minimal while at the high point of its trajectory. c. He is able to use air resistance to cushion his vertical motion. d. He is in the process of moving upward. e. His horizontal motion keeps him above the ground.