Apiston above 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 in kpa

3.43 kPa

Explanation:

Pressure is defined as the ratio between the force applied and the area of the surface on which the force is applied:

in this problem, the force corresponds to the weight of the load, which is given by the product between its mass (350 kg) and the acceleration due to gravity (9.8 m/s^2):

And since the area on which this force is applied is , the pressure exerted on the upper surface of the liquid is

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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