3. Sailors use a capstan (shown below) to raise and lower the anchor. It takes two sailors located 1 meter from the center to turn the capstan.
How far from the center would one sailor have to be to turn the capstan by himself?
A 1 meter
B. 2 meters
C.3 meters
D. Both B and C would work

B. 2 meters.

Explanation:

To rotate the capstan a certain amount of torque is required, and if each sailor applies a force at a distance from the center, then for two sailors the total torque will be

;

therefore,  for one sailor to apply the same torque it must be that the torque he applies must be equal to the torque that the two sailors applied:

which gives

.

and since ,

which is choice B.

like poles repel so keep pushing north to north and repels funny to see this

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.