A uniform magnetic field is applied perpendicular to the plane of a 60-turn circular coil with a radius of 6.0 cm and a resistance of 0.60 ?
If the magnetic field increases uniformly from 0.20 T to 1.8 T in 0.20 s, what is the magnitude of the emf induced in the coil?
A) 7.2 V
B) 5.4 V
C) 9.2 V
D) 12 V
E) 16 V
B
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The predictions of special relativity can sound implausible at first. What observational evidence do scientists have that the theory is correct?
A) Subatomic particles in accelerators exhibit effects of time dilation and mass increase at high speeds. B) Light is always observed to travel at the same speed. C) Time dilation can be observed in airplanes. D) All of the above
A bar magnet and an electrically polarized object are placed next to each other on a table. What happens?
A. The object and magnet accelerate toward each other until they touch and then they repel B. The positive part of the object turns toward the north pole of the magnet C. The positive part of the object turns toward the south pole of the magnet D. Nothing happens
A bike (shown in a top view in the diagram) travels around a curve with its brakes on, so that it is constantly slowing down. Which of the arrows shown most closely approximates the direction of the bike’s acceleration at the instant it is at the position shown? (Hint: Draw a motion diagram.)
A. A
B. B
C. C
D. D
E. E
F. F
T. T
The primary way that we observe the atomic hydrogen that makes up most of the interstellar gas in the Milky Way is with ________
A) radio telescopes observing at a wavelength of 21 centimeters B) X-ray telescopes C) space-based ultraviolet telescopes D) ground-based visible-light telescopes