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A power washer used to clean the sidingof a hosue has water entering through a hose at 20C, 1atm and avelocity of 0.2m/s. A jet of water exits with a velocity of20m/s at an average elevation of 5m, with no significant change intemperature or pressure. At steady state, the magnitude ofthe heat transfer rate from the power washer to the surroundings is10% of the electrical power input. Evaluating electricity at8 cents per kW x h determine the cost of the power required, incents per liter of water delivered. Compare with the cost ofwater , assuming 0.05 centers per liter, andcomment.
If the engine exerts a traction force of 1/8 of the weight of the train, determine the speed of the train when it has traveled up the slope a distance of 1.1 . Neglect rolling resistance.
A 60 ohm, 40 ohm, and 20 ohm resistor are each connected in parallel across a 120VAC source. What is the total current.
problem a compound cylinder is composed of a tube of 250mm internal diameter at 25mm wall thickness. it is shrunk on to
1. consider the hoover dam hydro-electric plant located in arizona and nevada. if the average lake level is 160 m above
An 8-kg plunger is released from rest in the position shown and is stopped by two nested springs; the constant of the outer spring is k1 = 4 kN/m and the constant of the inner spring is k2 = 12 kN/m. If the plunger is released from the height
a robotic rover on mars finds a spherical rock with a diameter of 10 centimeters. the rover picks up the rock and lifts
the initial velocity v0 of a hockey puck is 105 mih. determine a the largest value less than 45deg of the angle a for
air at 100 o f and 14.7 psia has a dew point temperature of 70o f. determine the relative humidity and the humidity
determine the expected rating lives in hours of a 35 mm bore 02 and 03 series straight cylindrical bearings operating
Use calculus to obtain a closed-form solution for the case where the parachutist jumper is initially at rest (v=0 at t=0) to solve F(upward)= -cv^2, where c = a second-order drag coefficient (kg/m).
the environment in a certain area is 15 degrees c. plot the maximum efficiency of a nuclear power plant as a function
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