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The heat input to a cold box is to be reduced by adding extruded polystyrene sheets ( p=55kg m^-3 , k=0.027W m^-1 K^-1 , Cp=1.21kJ kg^-1 K^-1) to all sides. The box is 3 feet on a side and all sides are in contact with air. when the box is placed in a constant-temperature room which is maintained at 70 degrees F, the heat loss is 40,000 Btu h^-1. It is desired to redue this by a factor of 100 while maintaining the inside temperature at -30 degrees F. find the appropriate insulation thickness in inches.
calculate the nusselt number and the convective heat transfer coefficient for water at a bulk temperature of 32oc
For the pendulum shown in the figure,the restoring torque due to gravity is given by T=mgLsin(thita). Derive the linearised equation about the operation point thita=0.
the wheel consists of a 4-kg rim of 250-mm radius with hub and spokes of negligible mass. the wheel is mounted on the
a completely mixed chemical reactor has an in fluent flow with conc. 150 mgl of a and a flow rate of 100 galmin 380
a long conducting rod of rectangular cross-section 20 mm x 30 mm and thermal conductivity of 20 wmk experiences uniform
if the 50 kg. crate starts from rest and attains a speed of 6ms when it has traveled a distance of 15m. determine the
a device with no moving parts provides a steady stream of chilled air at -25c and 1 bar. the feed to the device is
an accelerometer indicates that part of a machine element is vibrating harmonically at 82cps with a maximum
what was its velocity during this time? (Hint: Take the origin to be the location of the radar.)
in subsea oil and natural gas production hydrocarbon fluids may leave the reservoir with a temperature of 70 degc and
Probabilistic Hough transform in big O notation
underground water is to be pumped by a 70 percent efficient 3 kw submerged pump to a pool whose free surface is 30 m
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