Question

How much work will a machine with a power rating of 1.1 × 103 watts do in 2.0 hours?

A. 1.5 × 106 joules
B. 2.1 × 106 joules
C. 4.0 × 106 joules
D. 8.1 × 106 joules

Answer 1

D.

Step-by-step explanation:

8.1X10 to the power of 6 Joules.

Answer 2

7.92×10^6Joules

Step-by-step explanation:

Power is defined as the rate of change in work done. Mathematically, Power = Workdone/Time

Given power = 1.1×10³watts

Time = 2.0hours = 2×60×60

= 7,200seconds

Workdone = power × time

Work done = 1.1×10³×7200

Workdone = 7,920,000Joules

= 7.92×10^6Joules