72kg is hanging on a rope .what is the force of tension on the rope ?

705.6 N

Explanation:

The object is hanging on the rope, so there are two forces acting on the object:

- The force of gravity, downward, equal to

W = mg

where m is the mass of the object and g the acceleration of gravity

- The tension in the rope, T, upward

Since the object is hanging motionless, the object is in equilibrium, so we can write:

And therefore

For this problem,

m = 72 kg

Substituting,

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.