Faraday's Law: A flat square coil of wire with 15 turns and an area of 0.40 m2 is placed with the plane of its area parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in a time of 0.050 s. What is the magnitude of the average induced emf in the coil?
A. 6.0 V
B. 36 V
C. 45 V
D. 90 V
Answer: D
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Ultraviolet radiation from a star:
A) gets almost completely absorbed before it reaches Earth's surface. B) has a wavelength that is longer than the visible light emitted by the star. C) has a wavelength that is shorter than the X-rays emitted by the star. D) reaches most of Earth's surface through atmospheric windows.
Assume that all the circuit elements have the same resistance. (b) Which bulb is (or bulbs are) dimmest? (To indicate a pair of bulbs using the letters at the back of the book, point to two letters at the same time.)
A. Bulb A
B. Bulb B
C. Bulb C
D. All three bulbs are equally bright.
An ionic compound composed of a cation other than H+ and an anion other than OH- is called a(n)
a. salt. b. precipitate. c. conjugate base. d. electrolyte.
A thin uniform rod (length = 1.2 m, mass = 2.0 kg) is pivoted about a horizontal, frictionless pin through one end of the rod. (The moment of inertia of the rod about this axis is ML2/3.) The rod is released when it makes an angle of 37° with the horizontal. What is the angular acceleration of the rod at the instant it is released?
a. 9.8 rad/s2 b. 7.4 rad/s2 c. 8.4 rad/s2 d. 5.9 rad/s2 e. 6.5 rad/s2