Lecture 1

Question 1

3 types of solids

Answer 1

1. Solids
2. Crystalline solid
3. Amorphous solid-glass

Question 2

Definition of density

Answer 2

Rho…looks like a p

Mass divided by volume

Kg/m cubed
Or
G/cm cubed

Question 3

Definition of pressure

Answer 3

P= force divided by area

Pascal equals newtons per meter cubed

Question 4

If a fluid is at rest in a container

Answer 4

All portions must be in static equilibrium

All points at the same depth must be at the same pressure

Question 5

What forces are operating in a cube submerged and at rest in water

Answer 5

Pressure above and pressure below and gravity pushing on the mass, it’s weight

P1A1 + mg = P2 A2

P2 is the pressure below

Question 6

Equation for true pressure

Answer 6

P=P° + ₽gh

Where p° is atmospheric pressure
And ₽ is the density of the substance it is submerged in

Question 7

Atmospheric pressure is

Answer 7

14. 7lb/in squared

1. 013 x 10“5 Pascals

Question 8

Picture three vials sharing a base with vastly different sizes what is the pressure at given height

Answer 8

At any given height it will be the same across all three containers to

Question 9

Pascals principle

Answer 9

A change in pressure to an encompass fluid is transmitted to every point of the fluid and the walls of the container

Question 10

Picture a hydraulic press…pushing a small force a large distance equals

Answer 10

So at Borge ends it must be equals so
F1A1=F2A2

So rr arrange this equation

This is because of Pascals principle

Question 11

How do you find gauge pressure

Answer 11

P-P°=₽gh

Question 12

Picture the u shaped vail

Answer 12

The pressure at a point P will be the stomps hero. Pressure becUse that is pushing from top and

Just remember pascals principle! A change will illicit an equal change everywhere

Question 13

What is the buoyant force

Answer 13

The upward force

The cause of this is the difference between the pressure on top as the pressure on bottom

So you can really just imagine an object being gone and picture if two walls of water being held back…what would cause a larger bouyabt force

Question 14

Equation for bouyabt force

Answer 14

B=₽ fluid * V fluid * g= weight of fluid because density times volume equals mass and then mass times gravity equals we guy

The weight of the displaced fluid

Question 15

Buoyant force for a totally submerged object

Answer 15

Upward force is B=₽* V object * g

Downward force is w=mg=₽ * V * g

Net force is B-w

( ₽ fluid - ₽ object) *g * V object

Question 16

If a totally submerged object is lees dense than the fluid is

Answer 16

Tit will experience an upward force and accelerate upward

Opposite for denser object

Question 17

Equation for a floating object

Answer 17

So the forces must be equal so then

₽ fluid *V fluid = ₽ object * V object

Now rearrange

Question 18

4 states of matter

Answer 18

Gas
Liquid
Solid
Plasma