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For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air. Because of the air jets, the friction impeding the horizontal motion of the platform is negligible. Each time the heart beats, blood is pushed out of the heart in a direction that is nearly parallel to the platform. Since momentum must be conserved, the body and the platform recoil, and this recoil can be detected to provide information about the heart. For each beat, suppose that 0.050 kg of blood is pushed out of the heart with a velocity of +0.25 m/s and that the mass of the patient and the platform is 75 kg. Assuming that the patient does not slip with respect to the platform, and that the patient and the platform start from rest, determine the recoil velocity.
A mountaineer uses a global positioning system receiver to measure his displacement from base camp to the top of Mount McKinley, what is the displacement in going from base camp to the top
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A 430g football is lying on the ground, then is kicked and is moving at 25.00 m/s. If the period of the impact was 0.001 s, what was the average force on the ball.
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A physics demo launches a ball horizontally while dropping a second ball vertically at exactly the same time. Which ball hits the ground first? and why
You and a friend are studying late at night. There are three 150 W light bulbs and a radio with an internal resistance of 79.0, How much electrical power are you using
An inductor, a capacitor, and a 64.0-? resistor are connected in series with an AC generator; what is the average power output of the generator
A thin ring of radius R carries a charge 3Qdistributed uniformly over three-fourths of its circumference, and -Q over the rest
Consider a tiny bead of mass 10-6 g on a short wire of length 10-6 m as equivalent to the quantum model of ‘particle in a box
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