Acar traveling along the highway needs a certain amount of force exerted on it to stop it in a
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Physics, 02.02.2020 04:43, KindaSmartPersonn
Acar traveling along the highway needs a certain amount of force exerted on it to stop it in a
certain distance. more stopping force is required when the car has
a) more mass.
b) more momentum.
c) less stopping distance.
d) all of these
e) none of these
Answers: 1
Physics, 22.06.2019 03:30, zahradawkins2007
As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.
Answers: 3
Physics, 22.06.2019 17:40, yoongnzl
Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.
Answers: 1
Chemistry, 10.02.2021 03:30
Mathematics, 10.02.2021 03:30
Computers and Technology, 10.02.2021 03:30
Mathematics, 10.02.2021 03:30