Which of the following is NOT true?
The fossil record is complete
The fossil record is...
Physics, 09.02.2021 18:30 admiralaj85
Which of the following is NOT true?
The fossil record is complete
The fossil record is incomplete
The fossil record contains examples of fossil sequences showing close ancestral relationships
Living species show evidence of common ancestry
Answers: 2
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To create electromagnetic induction, which of the following has to move? a. a wire b. a magnet c. a transformer d. either a or b
Answers: 2
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Apulley with a mechanical advantage of 5 will require you to pull times the amount of rope. a. 1/5 b. 5 c. 10 d. 15
Answers: 2
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Simple machines can a. increase force only b. decrease force only c. increase or decrease force
Answers: 3
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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
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