Solve Pressure Problem: Car Lift of 1000kg, 1atm Overpressure

[Nanu Nana]

Homework Statement

A car is put into a garage higher by a hydraulic lift. How large should be the surface on which the vehicle rest if you to lift a vehicle of 1000kg higher with overpressure of 1 atm?

Homework Equations

[/B]
Pabsolue pressure = P atmos + P relative
P=F/A
F=m xa

The Attempt at a Solution

P absolute = 101325 Pa +101325 pa
1000kg x9.81 m/s^2 / (A) = 202650
1000kg x 9.81 =202650A
A= 1000x9.81 /202650
A=0.04840 m^2

But the answer should be 9,682.10-2 m 2

 

[Dr. Courtney]

It's always a hint when your answer is off by very close to a factor of two.

 

[Nanu Nana]

It's always a hint when your answer is off by very close to a factor of two.

I don't understand

 

[J Hann]

What would be the net force produced using a closed cylinder containing air at atmospheric pressure?

 

[haruspex]

I don't understand

Is there a vacuum above the car and the platform it stands on?

 

[Nanu Nana]

Is there a vacuum above the car and the platform it stands on?

No there is no vacuum

 

[haruspex]

No there is no vacuum

Right. So what force have you overlooked?

 

[Nanu Nana]

It's always a hint when your answer is off by very close to a factor of two.

Thank you for helpful videos

 

[Nanu Nana]

Force of gravity?

 

[haruspex]

Force of gravity?

What force is acting on the platform that would not act on it under a vacuum?