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A three-blade helicopter blade rotates at 200 rpm. If each blade is 12 ft long and 1.5 ft wide, estimate the torque needed to overcome the friction on the blades if they act as flat plates. Assume the flow is laminar.
An uninsulated thin-wall pipe of 75 mm diameter is used to transport water at a temperature of 3?C to an outdoor cooling towe
calculate the critical heat flux on a large horizontal surface for the following fluids at 1 atm mercury ethanol and
water at 10degc is pumped from a lake through a pipe to an elevation of 25 m above the lake surface. the pipe is 650 m
air enters an adiabatic diffuser operating at steady state at 540 degrees r with a velocity of 600 fts and exits with a
a force of 3 n stretches a spring by 1 m. a mass of 4 kg is attached to the spring. at t0 thenbspmass is pulled down a
the aluminum plate of thickness t 3.5 mm. is to be designed so the maximum stress remains below 100 mpa. the hole must
a piston-cylinder device contains an ideal gas. the gas undergoes two successive cooling processes by rejecting heat to
How long wi1l it take for the mid plane temperature to achieve 50% of its maximum possible temperature reduction?
Describe the physical properties of water that are relevant to its critical roles in plant physiology.
determine the maximum theoretical speed that may be achieved over a distance of 360ft by a car of weight w starting
5 kgmin of 25 degree celsius water mixes with 7 kgmin of 72 degree celsius water in a mixing chamber. calculate the
steam is compressed by a compressor from 120oc and 150 kpa to 200oc and 1.5 mpa. the work input is measured to be 485.4
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