A rectangular loop of wire measures 1.0 m by 1.0 cm. If a 7.0-A current flows through the wire, what is the magnitude of the magnetic force on the centermost 1.0-cm segment of the 1.0-m side of the loop? (?0 = 4? × 10-7 T ? m/A)
A) 4.9 × 10-6 N B) 9.8 × 10-8 N C) 9.8 × 10-6 N D) 7.8 × 10-7 N
C
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The magnifying power of a telescope equals:
A) the diameter of the primary lens or mirror of the telescope. B) the focal length of the primary mirror or lens divided by the focal length of the eyepiece. C) the diameter of the eyepiece of the telescope. D) the focal length of the eyepiece divided by the focal length of the objective of the telescope.
A figure skater spins at the end of her routine, and slows down with an angular acceleration of 1.2 radians per second squared. If she initially spun with a period of 0.2 seconds, how many turns does she go through while slowing to a stop?
A. 65 B. 6 C. 33 D. 15
A circular coil (radius = 0.40 m) has 160 turns and is in a uniform magnetic field. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.16 N ? m when the current in the coil is 4.0 mA. What is the magnitude of the magnetic field?
A. 0.37 T B. 1.6 T C. 0.50 T D. 1.2 T E. 2.5 T
Foucault's pendulum:
a. continues to swing back and forth in the same fixed direction relative to the ground. b. keeps swinging faster because the centrifugal force of Earth's rotation affects its weight. c. changes how far it goes on each swing because of Earth's motion around the Sun. d. changes the direction of its back and forth swing because Earth rotates beneath it. e. changes the direction of its back and forth swing because of gravity.