A bicycle pump uses Pascal’s law to operate. The air in the hose acts as a fluid and transfers force and pressure from the piston to the tire. If a pump has a piston with an area of 8.2 cm2 , how much force must be exerted on it to create a pressure of 3.9 × 10E3 Pa? 20. In a newly designed car with a hydraulic braking system, a force of 62 N is applied to one of the master cylinders, which has an area of 3.5 cm2 . The master cylinder is connected to one brake piston, which exerts a force of 371 N. What is the area of the brake piston?