An elevator cab is pulled upward by a cable. The cab and its single occupant have a combined mass of 1820 kg. When that occupant drops a coin, its acceleration relative to the cab is 8.50 m/s2 downward. What is the tension in the cable?

Explanation:

Given

combined mass of cab and occupant is

acceleration of coin w.r.t cab is

we can write

where =acceleration of coin w.r.t cab

=acceleration of cab w.r.t ground

=acceleration of coin w.r.t ground

thus

i.e. elevator is moving downward with an acceleration of

Therefore

iron would move it is magnetic there is a mag field around the current in the wire