### What is the change in internal energy of the gas

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Q1. What happens to a contracting cloud when its thermal energy can no longer escape cloud's interior in the form of photons? How does the trapped thermal energy affect the process of star formation?

Q2. A gas expands from I to F. The energy added to the gas by heat is 442 J when the gas goes from I to F along the diagonal path. What is the change in internal energy of the gas?

Respond in units of J

Q3. Tarzan (m = 85 kg) tries to cross a river by swinging from a 10.0 m long vine. His speed at the bottom of the swing, just as he clears the water, is 9.0 m/s. Tarzan doesn't know that the vine has a breaking strength of 1.0 103 N. What is the total force Tarzan excretes on the vine?

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