One watt is equivalent to
A. one joule/second
B. one coulomb/second
C. one calorie/second
D. one horsepower
Answer: A. one joule/second
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An astronaut weighs 99.0 N on the Moon, where the acceleration of gravity is 1.62 m/ s2. How much does she weigh on Earth?
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A. Radio waves B. X-rays C. Visible light D. Gamma rays
A machinist needs to punch a 5.0-cm-radius hole in a steel plate which is 0.45 cm thick. If the ultimate shear strength of steel is 2.50 × 10^8 Pa, what is the force required to accomplish this task?
a. 8.8E+5 N b. 3.5E+5 N c. 5.6E+6 N d. 1.1E+8 N