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Mary applies a force of 79N to push a box with an acceleration of 0.47 m/s2.When she increases the pushing force to85N,the box's acceleration changes to 0.73 m/s2. There is a constant friction force present between the floor
before installing the water pipes in a new house an engineer measured the pressure in main water line near the house to
water is the working fluid in a cogeneration cycle that generates electricityand provides heat for campus buildings.
a rocket moving in space far from all other objects has a speed of 2.5 103 ms relative to the earth. its engines are
a pulley of 100 mm diam drives one of 200mm diam by means of a belt. if the angular velocity of the drive pulley is 65
two kg of superheated steam contained in piston cylinder at 400 c and 600 kpa are cooled at a constant pressure by
Air enters a pipe at 25 0C, 100 kPa at a flow rate of 36 m3/hr. A heater on the outside of the pipe draws 8 amps at a voltage of 120 V. All the heat from the heater is transferred to the air (well insulated and wall t is small). Assuming that the air..
helium gas which may be treated as an ideal gas with r 386 ft-lbflbm- degree r is contained in a rigid 8-ft3 internal
calculate the critical crack tip radius for a ceramic material that has a flexural strength of 638 mpa an elastic
a rocket has a nozzle which is expanded from a chamber pressure of 10 mpa to a pressure that is 23 of sea level
the cable is made of steel. what diameter should tar cable b so that the material does not exceed 50 percent of its
a reversible heat engine receives heat from a heat source at 1000oc and has a thermal efficiency of 45. the heat engine
how much work must be done by a carnot refrigerator to transfer 1.0 j as heat a from a reservoir at 1.1degc to one at
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