A solenoid has a magnetic field at its center of 7.400 mT. If the solenoid has 471 turns and a current of 7.908 amps, its length, in centimeters, is, to three decimal places. Required:
a. What minimum number of turns per unit length must the solenoid have?
b. What total length of wire is required?

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

it's a b and