Download Chapter 2 Homework 1. Define Pressure Pressure is the force per

Chapter 2 Homework
1. Define Pressure
Pressure is the force per unit area; the area is always perpendicular to the force.
The force may be a weight.
2. Define Archimedes Principle
The volume of the displaced water will be equal to the volume of the object
submerged in the water.
3. Define Pascal’s Principle
The pressure in two connected containers will be equal. Thus if the two cylinders
have different cross sectional areas the forces must also be different.
4. Explain what a force is
A force is a push or pull on an object.
5. What are the three states of matter and what are the properties of each state?
• Solid, definite shape and volume
• Liquid, definite volume, no definite shape
• Gas, no definite shape or volume
6. Explain buoyancy
Is the upward force on an object applied by a fluid. If the buoyant force is equal
to the weight of the object, the object will float.
7. If a force of 200 Newton is exerted on an area of .04 square meters, what is the
pressure?
F
P=
A
200 N
P=
.04m 2
N
P = 5000 2
m
8. Explain why we have air pressure
Air pressure is the weight of the air per unit area.
9. What would happen to your body if we removed all the air pressure around you?
If we removed the pressure from your body it would expand and your blood
would boil, due to the lack of pressure.
10. Explain why the pressure is greater at the bottom of a dam then at the top.
The deeper you go in a reservoir the more water that is above you and thus the
increase in weight on your body from the water. The pressure is the weight of the
water on the surface area of your body.
11. Why do we take the water off the bottom of the dam in a hydroelectric power
plant?
The deeper the water the greater the pressure, the greater pressure means an
increase in force, which will cause the water to have a higher velocity which
means more work can be done.
12. What is density?
It is mass per unit volume
13. If an object has a mass of 100 kg and a volume of .01 m3, determine the density.
Will it be more or less dense then water?
m
ρ=
V
100kg
ρ=
.01m3
kg
ρ = 10000 3
m
This is denser than water
14. How would you determine the density of irregular shaped object?
By determine the amount of water displaced when it submerged
15. Explain the principle of a hydraulic jack
A hydraulic jack is composed of two connected cylinders, one of a larger diameter
than the other. Since pressure in both cylinders are equal. The larger cylinder
must exert more force than the smaller.