You are Here: Home >< Physics

# Physics question - help. Watch

1. A diver is 50M below the surface of the water

The density of the water is 100 kg/m cubed and the acceleration of free fall is 10m/s squared.

Pressure = dhg. Density x Gravitational field strength x Change in height

Pressure = 1000x 10x50 = 500kPa

The window in the driver's helmet is 150mm wide and 70mm from top to bottom.

Calculate the force that the water on this window.

Force =

How do I work the second part out?

Pa = force(N)/area m squared

Do I rearrange the question to get force and turn the area from mm squared to m squared and times it to get force.

500,000 PA x ((150x70)/1000000) = 5250 N?
2. Is this P2 yeah? We're just getting upto that after Jan
I've got my P1 in January
3. (Original post by aliakhtar)
A diver is 50M below the surface of the water

The density of the water is 100 kg/m cubed and the acceleration of free fall is 10m/s squared.

Pressure = dhg. Density x Gravitational field strength x Change in height

Pressure = 1000x 10x50 = 500kPa

The window in the driver's helmet is 150mm wide and 70mm from top to bottom.

Calculate the force that the water on this window.

Force =

How do I work the second part out?

Pa = force(N)/area m squared

Do I rearrange the question to get force and turn the area from mm squared to m squared and times it to get force.

500,000 PA x ((150x70)/1000000) = 5250 N?
So the pressure in a stable fluid like this is the same everywhere and acts equally in all directions.

So, you're right.
4. Convert the dimensions to metres, then rearrange the equation for force and substitute your values in. Your final answer will be in newtons so long as you use Pascals for the pressure, and metres squared for the area.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: December 26, 2010
Today on TSR

### Degrees to get rich!

... and the ones that won't

### Cambridge interviews pour in...

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.