An automobile of mass 1900 kg is supported by a hydraulic lift having a large piston of cross-sectional area 10 m 2. The mechanic has a foot pedal attached to a small piston of cross-sectional area 0.5 m2. What force in Newtons must be applied to the small piston to raise the automobile

The force must be applied to the small piston to raise the automobile = 932 N

Explanation:

Given data

Mass = 1900 kg

Force = m g

Force = 1900 × 9.81 = 18639 N

Area of larger Piston = 10

Area of smaller Piston = 0.5

Force on smaller piston =

From the equilibrium

Pressure on larger piston = Pressure on smaller piston

= 932 N

Therefore the force must be applied to the small piston to raise the automobile.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

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