During a special ops mission a helicopter traveled eastward at 75 m/s against westward blowing wind moving at a speed of 8 m/s. What would most likely happen if the wind speed increased to 17 m/s? * A. The helicopter would decrease speed and continue to move to the east.
B. The helicopter would decrease in speed and begin moving westward.
C. The helicopter would continue moving eastward at a constant speed.
D. The helicopter would increase speed and continue to move to the east.

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?

What object a collides with object b and bounces back its final momentum is?

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