The lowest tone to resonate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pipe?
A) 1000 Hz
B) 400 Hz
C) 200 Hz
D) 600 Hz
E) 1400 Hz
B
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A long solenoid (diameter = 5.0 cm) is wound with 960 turns per meter of thin wire through which a current of 300 mA is maintained. A wire carrying 12 A is inserted along the axis of the solenoid. What is the magnitude of the magnetic field at a point 2.0 cm from the axis?
a. 0.41 mT b. 0.48 mT c. 0.38 mT d. 0.56 mT e. 0.24 mT
Cathode rays are now known to be
A) electrons. B) visible light rays. C) protons. D) x-rays. E) short wavelength light rays.
When you hear the horn of a car that is approaching you, the frequency that you hear is larger than that heard by a person in the car because for the sound you hear
a. wave crests are farther apart by the distance the car travels in one period. b. wave crests are closer together by the distance the car travels in one period. c. the car gets ahead of each wave crest before it emits the next one. d. the speed of sound in air is increased by the speed of the car. e. a speeding car emits more wavecrests in each period.
A humidifier water pan shown in the figure has a surface temperature of 95ºF when the surrounding temperature is 80ºF. If the pan is 2 ft square and the air moves over the pan at 2 ft/s, estimate the convective heat transfer coefficient.
