Asolid metal object hangs from a force sensor by a thread in the open air, and the actual weight is measured to be 0.71 n. then the object is lowered into a graduated cylinder of water until it is completely submerged but does not touch the bottom. the water level in the graduated cylinder measures 50 ml before the object is inserted and 75 ml after it's inserted. predict the apparent weight of the object when submerged in water (the new force sensor reading).

Which statement correctly describes the relationship between frequency and wavelength?

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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?