Awashbasin has an exit pipe covered with a plug of area 12 cm²
a chain is attached to the
centre of the plug to assist in pulling the plug away from the exit hole. the washbasin contains
water to a depth of 0.080 m.
the density of the water is 1000 kg /m³

what is the force acting on the plug due to the water?
a 0.96n b 800n c 9600n d 80 000n
the answer is a, but how is it worked out?

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.