The actual mechanical advantage of a pulley is 2. the pulley has 3 supporting strings. what is the efficiency of the pulley?

50%
66%
100%
150%

66 %

Explanation:

The efficiency of a pulley is equal to the ratio between the Actual Mechanical Advantage (AMA) and the Ideal Mechanical Advantage (IMA):

In this problem, we have:

- The AMA of the pulley is 2 (given by the text)

- The IMA of the pulley is 3 (the pulley has 3 supporting strings, so its IMA is 3)

Therefore, the efficiency is

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.