Which of these periodic motions are simple harmonic?
a. a child swinging on a playground swing (? = 45°)
b. a CD rotating in a player
c. an oscillating clock pendulum (? = 10°)
Ans: c. an oscillating clock pendulum (? = 10°)
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Estimate the time required to freeze vegetables in thin, tin cylindrical containers 15 cm in diameter. Air at –12°C is blowing at 4 m/s over the cans, which are stacked to form one long cylinder. The physical properties of the vegetables before and after freezing may be taken as those of water and ice, respectively.
GIVEN
? The freezing of vegetables in thin tin cylindrical cans with air flowing over the cans
? Container diameter (D) = 15 cm = 0.15 m
? Air temperature (T?) = –12°C
? Air velocity (U?) = 4 m/s
? Vegetables have the same properties as water and ice
FIND
? The time (t) to freeze the vegetables
ASSUMPTIONS
? Air temperature is constant
? Thermal resistance of the tin can is negligible
? Thickness of the tin can is negligible
? Thermal capacitance of the frozen vegetable layer is negligible
SKETCH
PROPERTIES AND CONSTANTS
The ice property values given in the problem statement of Problem 9.37 are
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A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current. The current results because
a. the coil acts like a transformer. b. the changing magnetic field induces an electric field in the wire. c. an electromagnetic wave is generated. d. the wire is ferromagnetic. e. none of the above