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Q. A spaceship moves past you at speed v. You measure the ship to be 287 m long, whereas an astronaut on the ship measures a length of 380 m. Find v.

Q. The Sun's total energy output is 4 x 1026 Watts, and 1 Watt is 1 Joule/seconds. Use the energy yielded from the proton-proton chain to determine how many proton-proton chain fusion cycles must be happening each second in the solar core.

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Category:- Physics
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