Two carts with magnets attached, make up a system. The mass of one cart and the magnet is 1kg and the mass of the other cart and magnet is 5 kg. They are initially at rest on a frictionless track and then are released causing the two magnets to repel one another. Each is given an initial speed of 0.5 m/s. Once the carts are separated, the space between them is large enough to make the magnetic forces negligible. The track is slanted such that one side is slightly lower than the other.

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

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?

The energy released by a nuclear fusion reaction is produced when