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A late-model Hummer has a frontal profile area of 3.1 m2 and a CD of 0.47. It is moving at a steady speed of 75 mph. a) If we ignore bearing friction, rolling resistance and "Johnny Law", how much power (in English units of hp) is needed at the wheels on level ground? b) If the engine/drivetrain efficiency (from fuel to the driving wheels) is 34 %, and the heating value of the gas is 44.5 MJ/kg, how much gas will we be using in gallons/hour?
a ball of diameter 0.05 m and specific gravity 0.5 is dropped from a height of 1 m into a large pool of water.
refrigerant 134a at -10degc 1.4 bar and a mass flow rate of 280 kghr enters an insulated compressor operating at steady
air at 101.3 kpa absolute and 25 c is flowing at a velocity of 10 ms in a wind tunnel. a long cylinder having a
a base for a building column measures 18.0 in by 18.0 in on a side and 12.0 in high. compute the cross-sectional area
if money is worth 6 compounded annually to you then you should prefer to receive 1750 per year for 5 years than to
a sled is traveling down a curve which can be approxmiated by a parabola y .01x2. find the magnitdue of the
a piston-cylinder initially contains 2.52 kg saturated liquid water at 200 degrees celcius. now heat is transferred to
Using the knon height and calculated base lenghth, what is the length of the slope of the ramp.
problem a 5x5 plate with a crack size of 2a1.5 is under a spectrum load as shown below. the plate has a yield strength
r-22 in a pistoncylinder has mass 1 kg and temp. 10degc with a volume of0.02 m3 . initially state 1 the piston rests on
determine the torque that can be applied to a solid shaft of 20-mm diameter without exceeding an allowable shearing
an electric motor has a rotor with a mass moment of inertia of 30 ft-lb-s2. what torque is required to accelerate it
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