First off, you have to convert 8 minutes into seconds. A minute is <em>60 seconds</em>, so multiply 60 by 8. 60×8=480 Now, change 10⁹ into a standard number. Since the number is 10 that is to have an exponent, the exponent, in this case 9, indicates how many zeros are in the standard number. 10⁹=1,000,000,000 So, multiply 480 by 1,000,000,000. 480×1,000,000,000=480,000,000,000 So, the answer is 480,000,000,000.
Power is measured in joules per second, or watts. A joule is a measure of energy equal to 1 newton-meter. These unit relationships tell you how to combine the numbers:
power = (35 N)(20 m)/(5 s) = (35·20/5) N·m/s = 140 J/s = 140 W
