Use hooke's law for this (f = - k s ): where f is the spring's restoring force; k is the spring constant; and s is the stretch. the negative sign means the spring's restoring force is opposite the stretch direction. you have a plot from weight [n] versus stretch [m]. the data forms a linear trend y = 3.662 * x + 1.67. how much will the spring stretch if 51.7 grams is hung on the spring? answer in centimeters with three significant figures or n/a if not enough information is given to answer. when you calculate your ansswer, don't use the negative sign in the hooke's law formula. just know that the negative sign simply denotes the force direction is opposite the stretch (or compression).

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

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?

If the new moon happens on january 15th, what shape will it be on february 6th?