An astronaut weighs 900 N when measured on the surface of Earth. How large would the force of gravity on him be if he were in an Earth satellite at an altitude equal to Earth's radius?
A. 225 N
B. 450 N
C. 900 N
D. 3600 N
Ans: A. 225 N
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A water pump draws about 3.7 A when connected to 220 V. What is the cost (with electrical energy at 6.0 cents per kWh) of running the pump for 7.0 h?
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