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Q1. An airplane P is heading N 80o W at 240 m/s relative to the air. The wind blows from N 10o E with the speed of 41 m/s relative to the ground. Find the direction and magnitude of the velocity of airplane P relative to the ground.
In the meantime, the velocity of airplane Q relative to the air is 250 m/s in the direction of N 20o W. What is the speed of airplane Q relative to the airplane P?
Q2. A car starts from rest and moves along straight line with an acceleration of a = (3s-1/3) m/s2, where s is in meters. Find out the car's velocity and position when t = 6s.
If an average frequency emitted by a 200,-,rm W light bulb is 5.00 times 10^{14} , {rm Hz}, and 10.0 percent of the input power is emitted as visible light, approximately how many visible-light photons are emitted per second .
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An 82 kg parachutist descends through a vertical height of 350 m with constant speed. Find out the increase in entropy produced by the parachutist; assume the air temperature is 21 degrees C.
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