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consider a refrigerator or heat pump as in figure 137 for which the fluid temperatures just before entering stages 1 2
1 why do we model the heat transfer for gasoline piston engines as isochoric and that for turbine engines as isobaric2
a motorcycle engine does work at a rate of about 6 kw while burning a liter of gasoline every 20 minutesa given that
a toggle joint is a mechanism by which a comparatively small force p produces or balances a force f that increases
the tongs shown are used to grip an object for an input force of 12 lb on each handle determine the forces exerted on
the a-frame shown is pin-connected at a b c and d the surface at e is level and frictionless calculate the reaction at
the wall bracket shown is pin-connected at points a b and c calculate the pin reactions at these points neglect the
a 150 lb block rests on a horizontal floor the coefficient of friction between the block and the floor is 030 a pull of
a 200 lb block rests on a horizontal surface the coefficient of static friction between the block and the supporting
a tool locker having a mass of 140 kg rests on a wooden pallet assuming a coefficient of static friction of 038
calculate the maximum weight that the person in problem 614 can sustain if turns of rope are taken around the
a mass of 320 kg is prevented from falling by a rope wrapped around a horizontal stationary circular pole a force of
a belt is wrapped around a pulley for 180deg the loose-side belt tension is 50 lb and the coefficient of static
a jackscrew has a square thread with a pitch of 050 in the mean diameter of the thread is 2 in the coefficient of
the mean diameter of a square-threaded jackscrew is 180 in the pitch of the thread is 040 in and the coefficient of
the woodworking vise shown is designed for a maximum applied force of 225 n at each end of the handle the
calculate the value of the horizontal force p required to start the v-shaped wedge in motion to the right raising the
calculate the magnitude of the force p acting as shown that will cause the 200 lb crate to move either sliding to the
for the block-and-wedge system shown in figure 617 calculate the force p required to initiate upward motion of the
two blocks each having a mass of 100 kg and resting on a horizontal surface are to be pushed apart using a 30deg wedge
calculate the force p required to move the wedges and raise the 1000 lb block shown the coefficient of static friction
a heavy machine is lowered into a pit by means of a rope wrapped around an 8-in-diameter stationary pole placed
a flat belt passes halfway around a 180-m-diameter pulley the maximum permissible tension in the belt is 20 kn the
a belt-and-pulley arrangement has a maximum belt tension of 150 lb on the tight side and 75 lb on the loose side if the