In a demonstration, a 4.00 cm2 square coil with 10000 turns enters a larger square region with a uniform 1.50 T magnetic field at a speed of 100 m/s. The plane of the coil is perpendicular to the field lines. If the breakdown voltage of air is 4000 V/cm on that day, the largest gap you can have between the two wires connected to the ends of the coil and still get a spark is
a. 7.5 × 10^?3 cm.
b. 0.015 cm.
c. 7.5 cm.
d. 13 cm.
e. 15 cm.
c
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A string that is 0.26 m long is vibrating in its n = 6 harmonic. The sound from this string excites a pipe that is long and open at both ends into its second overtone resonance
What is the common resonant frequency of the string and the pipe? The speed of sound in air is 345 m/s. A) 760 Hz B) 690 Hz C) 390 Hz D) 490 Hz E) 590 Hz
A magnetic field is created by an electric charge if the charge is
a. positive. b. negative. c. moving. d. stationary. e. any of the above.
A boy plays solitary seesaw by placing the seesaw's fulcrum one-eighth the distance from where he sits at one end. Which weighs more?
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What defines the habitable zone around a star?
A) the region around a star where rocky planets form B) the region around a star where humans can survive C) the region around a star where liquid water can potentially exist on planetary surfaces D) the region around a star where the ultraviolet radiation does not destroy organisms on a planetary surface E) the region around a star where life exists