Answers: 1
Physics, 21.06.2019 15:00
Aparticle moves according to a law of motion s = f(t), 0 ⤠t ⤠12, where t is measured in seconds and s in feet. f(t) = cos(Ďt/6) (a) find the velocity at time t (in ft/s).
Answers: 3
Physics, 21.06.2019 23:50
The discovery that the universe appears to be expanding led to a widely accepted theory called a.) the big bang theory b.) the doppler effect c.) hubbleâs law d.) solar nebular theory e.) the seyfert theory
Answers: 2
Physics, 22.06.2019 03:30
What is the momentum of a 2 kg object moving at 15 meters per second
Answers: 1
Physics, 22.06.2019 07:10
Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ât. the resistance of the coil is r, and the total charge is q = iât, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly âswipedâ past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be âswipedâ through the reader at exactly the right speed? why or why not?
Answers: 2
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