Pascal's Law

If a hydraulic system has 1000 N applied to the input piston and has an area of 81 cm², what is the pressure?

• 12.35 Pa

• 12,346 Pa

• 1235 Pa

• 123457 Pa

The small piston of a hydraulic lift has an area of 0.20 m² . A car weighing 1.2 x 10⁴ N sits on a rack mounted on the large piston. The large piston has an area of 0.90 m² . How large force must be applied to the small piston to support the car?

• 2.7 x 10² N

• 2.7 x 10³ N

• 2.1x 10³ N

• 1.2 x 10⁴ N

In a hydraulic system, a piston with a cross-sectional area of 21 cm² pushes on an incompressible liquid with a force of 38 N. The far end of the hydraulic pipe connects to a second piston with a cross-sectional surface area of 100 cm². What is the force on the second piston?

• 1.8 x 10⁵N

• 7.98 N

• 55.26 N

• 1.8 x 10² N

Which of the following best suit the statement below?

Pressure applied to an enclosed fluid is transmitted undiminished to every point in the fluid and to the walls of the container.

• Bernoulli’s principle

• Pascal’s principle

• Archimedes principle

• Newton’s law

In a car lift, compressed air exerts a force, F₁ on a small piston having a radius of 0.055 m. This pressure is transmitted to a second piston of radius 0.20m as shown in figure above. The mass of the car is 1250kg. Acceleration due to gravity g=9.8m/s². F=ma

Calculate the pressure on the smaller piston F_1.

• 100kPa

• 130kPa

• 97.48kPa

• 151.2kPa

A force of 100 pounds is applied to the input cylinder of the hydraulic press seen below. How much force can the output cylinder lift?

• 900 pounds

• 300 pounds

• 11.1 pounds

• 25.2 pounds

A force of 100 pounds is applied to the input cylinder of the hydraulic press seen below. What is the mechanical advantage of the system?

• 5

• 1/9

• 9

• 10

A force of 100 pounds is applied to the input cylinder of the hydraulic press seen below. What is the pressure in the system?

• 71.62 psi

• 7.96 psi

• 6.21 psi

• 10 psi

Water is considered an incompressible fluid because..

• the distance between the molecules is greater when a force is applied

• its density increase when an external pressure is applied

• the changes of its density due to changes in pressure are very small

• the changes of the pressure due to changes in density are very small