Question

if a machine performs 1200 j of work in 30 seconds, what is its power output? (power = work / time)
4 w
40 w
400 w
4000 w

Explanation:

Step1: Identify the formula for power

Power \( P=\frac{W}{t}\), where \( W\) is work and \( t\) is time.

Step2: Substitute the given values

Given \( W = 1200\space J\) and \( t=30\space s\). Then \( P=\frac{1200}{30}\).

Step3: Calculate the power

\( P = 40\space W\)

Answer:

\(40\space W\) (the second option)