An ice-box is built of wood 1.75 cm thick, lined with cork 3 cm thick. If in the steady state the temperature of the inner surface of the cork is 0 ºC and that of the outer surface of wood is 12 ºC, what is the temperature of the wood-cork interface? The thermal conductivities of wood and cork are 0.2 W/m-K and 0.04 W/m-K respectively

2738

Does gas have density?

1006

What is fusion?

972

A truck travels 420 m. Each tire on the truck has a diameter of 42 cm. If one revolution of a tire is equal to 2? Times the radius of the tire (in meters), which of the following equations shows how many revolutions each tire makes as the distance is traveled?

926

Do mountains exist on moon? How were they formed?

864

Tell me what's the difference between 'soft' rock and 'hard' rock geology?

852

What is anti - noise?

1074

Explain what is the shadows?

1001

Is a sewing needle magnetic or non magnetic?

1221

a car starts from rest with uniform acceleration "a" for sometime and then with uniform retardation "b" and comes to rest. The time of motion is "t". find the maximum velocity attained by it?

1960

What are newton s laws of motion?

1116

What is astronomical telescope?

974

What is the time taken to reach a rain drop on to the earth surface, and what is the distance or height from rain drop start to fall to the earth surface?

3062

With the formula Frequency=(np)/120 were does the 120 come from I realize it to be a constant but how was it determined

3162

Explain the constitution of mantle?

847