Physics, 27.02.2020 04:23 XxKaitlynnxX
A child sits at the top of a slide at a playground. He wiggles forward slightly, and then slide all the way down with no further effort. Explain the source of the force acting on the child, and how you would calculate the work being done.
Answers: 2
Physics, 22.06.2019 07:10, cannan
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 ∆t. the resistance of the coil is r, and the total charge is q = i∆t, 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 “swiped” 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 “swiped” through the reader at exactly the right speed? why or why not?
Answers: 2
Physics, 22.06.2019 09:00, celestemaria0727
For which pair of objects would adding the same a
Answers: 1
Physics, 22.06.2019 10:10, Kitty10101
Apair of 10μf capacitors in a high-power laser are charged to 1.7 kv. a. what charge is stored in each capacitor? b. how much energy is stored in each capacitor?
Answers: 2
Physics, 22.06.2019 10:30, sakotaco3455
In science and physics what is the standard unit of measure for speed?
Answers: 1
A child sits at the top of a slide at a playground. He wiggles forward slightly, and then slide all...
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