Asolar heated house loses about 5.4 × 107 cal through its outer surfaces on a typical 24-h winter day.

what mass of storage rock is needed to provide this amount of heat if it is brought up to initial temperature of 62°c by the solar collectors and the house is maintained at 20°c? (specific heat of rock is 0.21 cal/g⋅°c.)

a. 163 kg
b. 1 230 kg
c. 6 100 kg
d. 12 700 kg

In order for the bug to fly through the air a force has to push the bug forward. identify this force. how does the bug produce

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

How will the system respond to a temperature increase?