An experimental bicycle wheel is placed on a test stand so that it is free to turn on its axle. If a constant net torque of 8.00 Nm is applied to the tire for 5.00 s, the angular speed of the tire increases from 0 to 10 rad/s. The external torque is then removed, and the wheel is brought to rest by friction in its bearings in 60 s. Compute (a) the moment of inertia of the wheel about the rotation axis;
(b) the friction torque;
(c) the angular displacement made by the wheel in the 60-s time interval.

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?

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o

Awave that is traveling fast can be said to have a high a. frequency b. speed c. wavelength d. amplitude e. period f. none of these