calculate the rate of loss of heat through a glass window of area 100cm^2 and thickness 1cm when tempeture inside is 30°C and outside is -5°C, coefficient of thermal conductivety of glass is 2.2×10^-3 cal s^-1 cm^-1 K^-1.

The brightest star in the night sky in the northern hemisphere is sirius. its distance from earth is estimated to be 8.7 light years. a light year is the distance light travels in one year. light travels at a speed of 3.00 × 108 m/s. calculate the distance from earth to sirius in miles. (1 mi = 5280 ft) g