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Q. A sphere that is a perfect blackbody radiator has a radius of 0.140 m and is at 250°C in a room where the temperature is 27°C. Calculate the net rate at which the sphere radiates energy.

Q. A 82 kg astronaut and a 1400 kg satellite are at rest relative to the space shuttle. The astronaut pushes on the satellite, giving it a speed of 0.12 m/s directly away from the shuttle. Seven-and-a-half seconds later the astronaut comes into contact with the shuttle. What was the initial distance from the shuttle to the astronaut?

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