Question

A moving company uses a machine to raise a 900-newton refrigerator to the second floor of a building. The machine consists of a single pulley with a mechanical advantage of 1. How many newtons of input force will it take to raise the refrigerator? 1 N 100 N 450 N 900 N 9,000 N

Answer 1

For this case we have that the mechanical advantage is given by the following equation:
 $MA = \frac{W}{T}$
 Where,
 W: is the load
 T: is the tension
 Since the mechanical advantage is equal to 1, then we have:
 $1 = \frac{W}{T}$
 Therefore, by rewriting the equation we have:
 $T = W$
 Then, replacing values we have:
 $T = 900$
 Answer:
 it will take to raise the refrigerator about 900 N of input force

Answer 2

Answer:

Mechanical advantage of a machine is the ratio of the output force over the input force or M=Fo/Fi. Since M=1, Fi=Fo, or the input force is equal to the output force. This means that to raise the refrigerator that weighs 900 N, we need the same input force of 900 N, or Fo=Fi=900 N. 

Simply put, THE ANSWER IS: 900N

Explanation:

I got this question on a test and this was the right answer

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