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In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?
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Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions
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Blank liquids and gases exert a buoyant force on objects placed in them
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What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?
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My little brother makes a ramp to push his toy dump truck to his sandbox...
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