2litre of water at is poured into a plastic bucket containing 10 litre of water at 20 degree celsius. what is the final temperature of water? (density of water=1kg/litre)

Explanation:

Given

volume of water in bucket

density of water

thus

suppose

Conserving heat energy i.e. heat lost by water is gained by water in bucket

where T=final Temperature

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.