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Q. If the balloon is 24.9 cm in diameter when the child loses it, what is its diameter at an altitude of 1510 m? Assume that the balloon is very flexible and so surface tension can be neglected.

Q. A 7 g lead (cp = 128 J/kg•°C) bullet traveling at 275 m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while the other half is transmitted to the tree, what is the increase in temperature of the bullet?

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Category:- Physics
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