Everything looks red through a red filter because
A) the filter emits red light and absorbs other colors.
B) the filter absorbs red light and emits other colors.
C) the filter transmits red light and absorbs other colors.
D) the filter reflects red light and transmits other colors.
D) the filter reflects red light and transmits other colors.
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Of all the forms of electromagnetic radiation, the one with the lowest frequency is
A) gamma rays. B) ultraviolet rays. C) visible light. D) microwaves. E) radio waves.
The core of a long solenoid with 1000 turns/m and a current of 0. 5 A is filled with an unknown material. It is found that the magnetic field along the axis of the solenoid increases by 0.0017%
What is the magnetic susceptibility of the unknown material? A) 1.7 × 10-5 B) 3.4 × 10-5 C) 0.0048 D) -3.4 × 10-5 E) 0.0021
A refrigerator uses 40.0 J of work to extract heat from a heat reservoir at 
If the coefficient of performance of the refrigerator is 2.10, then how much heat is discharged out of the refrigerator at a higher temperature?
A. 52.0 J B. 66.0 J C. 86.0 J D. 124 J
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
