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As fresh poured concrete hardens, the chemical transformation releases energy at a rate of 2 W/kg. Assume the center of a poured layer does not have any heat loss and that it has an average heat capacity of 0.9 kJ/kg K. Find the temperature rise during 1 hour of the hardening (curing) process.
A total condenser is to be designed for condensing saturated 2-butanol vapor to form saturated 2-butanol liquid at 1 atm at the rate of 0.72 kmol/h. The saturation temperature of 2-butanol vapor at 1 atm is 99.6C. Cooling water at 25C and 1 atm is av..
Velocity and Acceleration Analysis of mechanism. The mechanism in Fig. 5.54 has the dimensions: AB=200 mm, AC=600 mm, BD=1000 mm, La=150 mm, and Lb=250 mm. The driver link 1 rotates with a constant angular speed of n=60 rpm. Find the velocities and t..
a piston-cylinder device initially contains 0.15-kg of steam at 3.5 mpa superheated by 5degc. now the steam loses heat
Design brief provided to produce a design proposal for an experimental rig which will measure the mass properties of a bicycle wheel.
an engineer needs to monitor a flow of 20degc gasoline at about 250plusmn25 galmin through a 4- in-diameter smooth
At one section in an air distribution system, air at 14.7 psi and 100degree F has a velocity of 1200 ft/min a and the duct is 12 in x12 in square. At another section the duct is round with a diameter of 18 inches and the velocity is 900 ft/min. Calcu..
A. 0.75 kg of nitrogen is compressed in a cylinder polytropically (n = 1.3). The initial conditions are 140 kPa & 37 C. The gas is compressed until the volume is reduced by half (50% of original). Assume constant specific heats at 300 K
a 5.0 kg steel block is resting on a horizontal table. the coefficient of static friction us is 0.75 and the uk is
a tugboat tows a ship at a constant velocity. the tow harness consists of a single tow cable attached to the tugboat at
dry air having a mass flowrate of 2 kgs and a temperature of 300k merges with dry air flowing at 3 kgs and having a
the heat supplied by a heat pump used to maintain a buildings temperature is often supplemented by another source of
a piece of steel has a conductivity of k 15 wmk and a brick has k1wmk. how thick a steel wall will provide the same
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