what is the efficiency of a pulley that requires a worker to do 250 J of work to lift an object that requires 170 J of work
efficienc7= 170/250 x 100 if you want it in percent.
To calculate the efficiency of a pulley system, you'll need to compare the output work with the input work. Here's how to calculate it:
1. Determine the input work (W_input): In this case, the worker does 250 J of work to lift the object.
2. Determine the output work (W_output): The object requires 170 J of work to be lifted.
3. Calculate the efficiency (Efficiency = W_output / W_input): Divide the output work by the input work and multiply by 100 to express it as a percentage.
Let's plug in the values and calculate the efficiency:
Efficiency = (170 J / 250 J) * 100 = 0.68 * 100 = 68%
Therefore, the efficiency of the pulley system is 68%.