Physics, 29.11.2019 04:31 garrettbridges6435
Consider a father pushing a child on a playground merry-go-round. the system has a moment of inertia of 84.4 kg · m². the father exerts a force on the merry-go-round perpendicular to its 1.50 m radius to achieve a torque of 375 n · m.
(a) calculate the rotational kinetic energy (in j) in the merry-go-round plus child when they have an angular velocity of 14.8 rpm. j
(b) using energy considerations, find the number of revolutions the father will have to push to achieve this angular velocity starting from rest. revolutions
(c) again, using energy considerations, calculate the force (in n) the father must exert to stop the merry-go-round in four revolutions. n
Answers: 2
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Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)
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Physics, 22.06.2019 14:00, ogneshelle
The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?
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Consider a father pushing a child on a playground merry-go-round. the system has a moment of inertia...
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