(a) in an experiment, cold water is poured into a bowl made of an insulating material, the container
is placed in a draught-free room. After several hours, the volume and the temperature of the
water are found to have decreased.
Name and describe the process that causes the decrease in the volume of the water, and
explain why the temperature of the water decreases.

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?