Apiston above a liquid in a closed container has an area of 1m2. the piston carries a load of 350 kg. what will be the external pressure on the upper surface of the liquid? a. 4.90 kpa b. 27.3 kpa c. 68.6 kpa d. 3.43 kpa

Explanation :

It is given that,

Area of the container,

Load carried by piston, m = 350 kg

Pressure on the upper surface of the liquid is defined as the force acting per unit area.

Mathematically it can be written as :

From Newton's second law of motion :

F = m a

So,  

P = 3430 Pa ( Pa = pascal)

or

P = 3.43 kPa

So, the correct option is (D)

Hence, this is the required solution.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.