Part 1: match the letters on the graph to the statements in #1-3 that best describe clara's motion. then answer questions
4 and 5.
1. clara has a positive acceleration for 5 minutes.
2. clara has zero acceleration.
graph of clara's motion
1400
1200
1000
- b
800
3. clara is speeding up for 10 minutes.
velocity (m/min)
4. calculate clara's acceleration for part a of her run.
5
20
25
10 15
time (min)

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

An ideal gas is held in a container at constant volume. initially, its temperature is 5 degrees c and its pressure is 1.2 atm. what is its pressure when its temperature is 43 degrees c? answer in units of atm

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?