A room at `20^@C` is heated by a heater of resistence 20 ohm connected to 200 VV mains. The temperature is uniform throughout the room and the heati s transmitted through a glass window of area `1m^2` and thickness 0.2 cm. Calculate the temperature outside. Thermal conductivity of glass is `0.2 cal//mC^@` s and mechanical equivalent of heat is `4.2 J//cal`.

A heater of resistance 20 Omega is used to heat a room at 10^@C and is connected to 220 V mains. The temperature is uniform inside the room and heat is transmitted outside the room through a glass window of area 1.2 m^2 and thickness 0.1 cm. If T^@C is the temperature outside and thermal conductivity of glass is 0.2 cal s^(-1) m^(-1) ""^@C^(-1) , then find the value of 10T - 75 close to nearest integer.

Calculate the rate of loss heat through a glass window of area 1000sq.cm. and thickness 4mm when the temperature inside is 37°C and outside is 5°C ( K for glass =0.0022)

A room is to be maintained at a constant temperature of 30^@C and is heated by a heater of resistance 10 Omega connected to 210 V mains supply. Heat is transmitted outside through a window of thickness 0.3 cm and area 2 m^2 What will be temperature outside the window? Thermal conductivity of glass = 0.3 cal s^(-1) m^(-1) ""^@C^(-1)

Calculate the rate of loss of heat through a glass window of area 1000 cm2 and thickness of 4 mm, when temperature inside is 27^@ C and outside is -5^@ C . Coefficient of thermal conductivity of glass is 0.022 cal/ s cm^@ C.

A heater of resistance R maintains a room at T_0 ""^@C and is connected to a mains supply of V volt. The heat is transmitted through a glass window of area A and thickness d. If the thermal conductivity of the glass is K, find the expression for the outside temperature.

Calculate the rate of loss of heat through a glass window of area 1000 cm^(2) and thickness 0.4 cm when temperature inside is 37^(@)C and outside is -5^@)C . Coefficient of thermal conductivity of glass is 2.2 xx 10^(-3) cal s^(-1) cm^(-1) K^(-1) .

The area of the glass of a window of a room is 10 m^(2) and thickness 2 mm . The outer and inner temperature are 40^(@)C and 20^(@)C respectively. Thermal conductivity of glass in MKS system is 0.2. The heat flowing in the room per second will be