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Concrete has a density of 2400 kg/m3 and a compressive strength of 30 MPa. What is the maximum height of a column of concrete that can support its own weight? Does the radius of the column matter?
design 2-shell pass and 8-tube pass heat exchanger for heating ethyl alcohol from 25degc to 70degc at a rate of 2.9
a 850-kg meteoroid happens to be composed of aluminum. when it is far from the earth its temperature is -13.5 degc and
a 10 gram mass is attached to the end of a 2 meter string which is perfectly flexible infinitely strong and weightless.
For a vehicle in gravitationless space, determine the mass ratio necessary to boost the vehicle velocity by 1600 m/sec; the effective exhaust velocity is 2000 m/sec and the initial total vehicle mass is 4000 kg.
consider an alcohol and a mercury thermometer that read exactly 0 c at the ice point and 100 c at the steam point. the
carbon is diffused into steel at 900oc over a period of 10 hrs. the solubility of carbon in steel at this temperature
determine a the velocity and acceleration of point p on the rim of the wheel when t0.5 s and b the total distance the
Wheel of radius r is driven by an arm OA. It is driving (without slip) wheel of a radius r2 which is fixed to a drum of radius r1. Load G is attached to the rope which winds on the drum. Calculate the speed of load G if the arm OA moves at n rev/m..
some of our modern kitcgen cookware is made of ceramic materials. a compare the relative properties and cost of three
the rubber mallet is used to drive a cylindrical plug into the wood member. if the impact force varies with time as
a power station output is 500 megawatts. during a test it is found that this represents 28 of the energy put into the
A light aircraft with a wing area of 200 ft2 has a lift coefficient of 0.4 and a drag coefficient of 0.05. the power required to maintain level flight is 66hp. determine the weight of the airplane. recall power is force in the direction of velo..
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