Physics Test - 66

To complete the vertical loop, the minimum speed required at the lowest point =

$\sqrt{5gR}$

A Sound wave needs a medium for propogation. Hence, Sound cannot travel through a vacuum.

A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibrations to work in.

Heat is associated with K.E of random motion of molecules.

As the inside of the cooker is painted black, heat absorption is more producing heat waves of longer wavelength which cannot escape through glass and hence are trapped inside. Thus the food is cooked.

Effect of adding liquid is to make the cylinder more bottom heavy which is a more stable position.

An object with a constant speed might be accelerated.

Learned indian classical vocalists do not like the accompaniment of a harmonium because tempered scale is used in the harmonium.

In the electrical circuit of a house, the fuse acts asa safety device.

Work is a scalar quantity.

Entropy is a measure of disorder . It will be maximum in gases followed by liquids and least in solids.

Hence, here the gas is only hydrogen and it has the highest entropy.