A box slides across a frictionless horizontal surface with constant acceleration 3.40 m/s2 and over a time interval reaches a final velocity of 13.0 m/s.

a. If its initial velocity is 6.50 m/s, what is its displacement (in m) during the time interval?

b. What is the distance it travels during this interval?

c. If its initial velocity is -6.00 m/s what is its displacement during the time interval?

d. What is the total distance it travels during the interval in part (c)?

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

the answer is a)

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