The scrapyard uses a big electromagnet to move around large metal objects such as cars and appliances. If the operator needed to drop a car to a new space, what would he need to do for this to happen?
A) The magnetic field cannot be turned off.
B) The magnetic field can be turned off by switching off the current.
C) The magnetic field can be reversed by switching the poles of the core.
D) The magnetic field can be decreased by placing it in proximity to an opposite pole.

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

pecialized keyboards

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000