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The thermometer in this problem: (A thermometer has a time constant of 10s and behaves as a first-order system. It is initially at a temperature of 30°C and then suddenly subjected to a surrounding temperature of 120°C. Calculate the 90 percent rise time and the time to attain 99 percent of the steady-state temperature.) is subjected to a harmonic temperature variation having an amplitude of 20°C and a frequency of 0.01Hz. Determine the phase lag of the thermometer and the amplitude attenuation. The time constant is still taken as 10s.
An airplane was moving with a velocity equal to 300 mph when the velocity was increased with uniform acceleration to 600 mph in 5 min, calculate the number of miles the airplane traveled during that interval of time.
a standard door into a house rotates about a vertical axis through one side as defined by the doors hinges. a uniform
an ideal gas of mass 2 kg is contained within a rigid cylinder and undergoes a cycle which consists of three separate
an insulated piston-cylinder device contains 100 l of air at 400 kpa and 25degc. a paddle wheel within the cylinder is
in a quasi-equilibrium process in a closed system a gas expands from a volume of 0.15m3 and a pressure of 120kpa to a
the workpart in a turning operation is 88 mm in diameter and 400 mm long. a feed rate of 0.25 mmrev is used in the
one surface of a 12-cm-thick slab thermal conductivity k2.5 wm. degree c is maintained at 100 degree c. the other
the uniform slender bar abc weighs 6 lb and is intially at rest with end a bearing against the stop in the horizontal
Calculate the overall heat transfer coefficient between the air and the water (answer in W/m^2K).
there are supplied to a nozzle 2400 lbhr of steam at an absolute pressure of 200 psia. at the entrance v1 6000 ftmin
1. steam is contained in a closed rigid container with a volume of 1 m3. initially the pressure and temperature of the
a refrigeration cycle is a reversed heat engine. which of the following has the maximum value of the co-efficient of
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