For tests using a ballistocardiograph, a patient lies on ahorizontal platform that is supported on jets of air. Because ofthe air jets, the friction impeding the horizontal motion of theplatform is negligible. Each time the heart beats, blood is pushedout of the heart in a direction that is nearly parallel to theplatform. Since momentum must be conserved, the body and theplatform recoil, and this recoil can be detected to provideinformation about the heart. For each beat, suppose that 0.050 kgof blood is pushed out of the heart with a velocity of +0.30 m/s and thatthe mass of the patient and the platform is 85 kg. Assuming that the patient does not slipwith respect to the platform, and that the patient and the platformstart from rest, determine the recoil velocity. m/s
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Physics, 22.06.2019 00:50
Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?
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Physics, 22.06.2019 16:00
Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?
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Physics, 22.06.2019 16:00
The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2
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Physics, 23.06.2019 02:30
What are two examples of phase changes that skip a phase during transition?
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For tests using a ballistocardiograph, a patient lies on ahorizontal platform that is supported on j...
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