An electric heater heats the air in an industrial chamber, raising its temperature from 30° C to 180° C. The mass of the air in the chamber is 1,200 kilograms. The specific heat of air is 1,000 J/kg °C. How much electrical energy does the heater consume?

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.