How many turns are in the secondary coil of a step up transformer that increases voltage from 30 v to 150 v and has seven turns in the primary coil?

350 + 507 = 3657 that would be your answer

The magnitude of the tension is less than the object's weight

Explanation:

As per the question:

From Fig. 1

The forces and the acceleration are shown in the figure

Since, the elevator slows down in its upward motion, this means that the final velocity is less than the initial velocity and the elevator decelerates.

Therefore, we take the acceleration as negative, '- a'.

Thus

Balancing the forces:

T - mg = m(- a)

T = mg - ma = m(g - a)

Thus it clearly shows T < mg