5 Density and pressure

Question 1

What is the formula for density?

Answer 1

Density = m / v

Question 2

What are the units used in this formula?

Answer 2

kg/m^3 = g / m^3

Question 3

How do you determine the volume of a regular solid?

Answer 3

By doing w x l x h

Question 4

How can you determine the volume of an irregular object?

Answer 4

You can use a displacement can and a measuring cylinder. You can look at the amount of water displaced from the can and that will determine the volume.

Question 5

What is the formula for pressure?

Answer 5

P = f / a

Question 6

When do the pressure in liquids and gases act equally?

Answer 6

The pressure in liquids act equally as long as the liquid is not moving.

Question 7

What is the amount of Pa being exerted on our bodies?

Answer 7

100 000Pa

Question 8

Why don’t we explode if 100 000 Pa of pressure is being exerted on our body?

Answer 8

This is because the pressure in our body is so similar.

Question 9

What is the formula to calculate pressure difference?

Answer 9

Pd = height x pressure x gfs
p = h x ρ x g

Question 10

What do you do when working out questions that involve walking?

Answer 10

Divide the area of your shoe by two as all your weight is on your foot at some point while you’re walking.