Homework Help: physics

Posted by y912f on Sunday, February 15, 2009 at 3:37pm.

how do i do this
A force of 230 N applied on a hydraulic lift raises an automobile weighing 6500 N. If the applied force is exerted on a 7.0 m^2 piston, what is the area of the piston beneath the automobile?
a. 2.0 * 10^2 m^2
b. 4.0 m^2
c. 0.25 m^2
d. 0.0050 m^2

A water bed that is 1.5 m wide and 2.5 m long weighs 1055 N. Assuming the entire lower surface of the bed is in contact with the floor, what is the pressure the bed exerts on the floor?
a. 250 Pa
b. 260 Pa
c. 270 Pa
d. 280 Pa

thanks for any help!

physics - drwls, Sunday, February 15, 2009 at 7:25pm
Use the principal that the pressure throughout the fluid is equal. The force that is applied by (or to) a piston is therefore proportional to its area. The automobile piston area must be larger by a factor 6500/230

The answer to the secoind proboem is water weight/water bed area. Round off to two significant figures and you will agree with one of those answers
physics - ji, Tuesday, April 6, 2010 at 11:29am
c.270

Answer this Question

Related Questions

physics - what formula do i need in order to solve this a force of 230 N applied...
Physics - (a) What is the acceleration of an automobile that goes from a dead ...
Physics - In a hydraulic lift, the radii of the pistons are 2.93 cm and 10.1 cm...
physics - What force must be applied to push a carton weighing 350 N up a 19&...
physics - What force must be applied to push a carton weighing 350 N up a 19&...
physics - What force must be applied to push a carton weighing 350 N up a 19&...
physics - What force must be applied to push a carton weighing 350 N up a 19°...
physics - A hydraulic jack is used to lift a 2000 pound car. If the output ...
physics - A Spring (k=790 N/m) has a length of 48 cm when zero net force is ...
physics - What force must be applied to push a carton weighing 220 N up a 20°...

For Further Reading

First Name:
School Subject:
Answer: