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U3f – L4 Solve these problems 1. A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure? 2. A 165 lb teacher stands exerts a pressure of 10 psi on a block of wood. What is the area of the block of wood? March 29, 2011 DRILL

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Page 1: U3f – L4 Solve these problems 1.A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

U3f – L4

Solve these problems

1. A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

2. A 165 lb teacher stands exerts a pressure of 10 psi on a block of wood. What is the area of the block of wood?

Take out handout from yesterday.

March 29, 2011

DRILL

Page 2: U3f – L4 Solve these problems 1.A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

U3f – L4

A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

Drill # 1

Step 1: Write given information

P1 = ?

V1 = 100 mL

P2 = 2 psi

V2 = 50 mL

Step 2: Write the formula and solve

P1*V1=P2*V2

P1* 100 mL = 2 psi*50mL

P1*100mL = 100mL*psi

P1 =100 psi*mL/(100mL)

P1= 1psi

Page 3: U3f – L4 Solve these problems 1.A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

U3f – L4

A 165 lb teacher stands exerts a pressure of 10 psi on a block of wood. What is the area of the block of wood?

Drill #2

Step 1: Write given information

P = 10 psi

F = 165 lb

A = ?

Step 2: Write the formula and solve

P = F/A

10psi = 165lb/A

10psi * A = 165 lb

A = 165 lb/(10 psi)

A = 16.5 in2

Page 4: U3f – L4 Solve these problems 1.A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

Read these articles

Self-Cleaning Windows on page 59

Gas-Plasma Displays on page 245

Synthetic Fuels on page 265

Wind Tunnels on page 660.

For each question, letter responses in complete sentences to the following questions?

• What is this technology used for?• How does it relate to fluid technology?• What other core technologies are important for this technology?• What did people use before this technology?

U3f – L4

Page 5: U3f – L4 Solve these problems 1.A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

P = F / A(Pressure = Force / Area)

PV = k(Pressure x Volume = Constant)

P1V1 = P2V2

(Initial P x Initial V = Final P x Final V)

Equations you must know

U3f – L3

Page 6: U3f – L4 Solve these problems 1.A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

Work in pairs.

Solve the problem by showing all of the steps

U3f – L4

Page 7: U3f – L4 Solve these problems 1.A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

U3f – L4

A basketball has 5 psi of pressure and 100 mL of volume. What is the pressure multiplied by the volume equal to? If we decrease the volume to 20 mL, what is Pressure times Volume?

Problem 1

Step 1: Write givn information

P1 = 5 psi

V1 = 100mL

P2 = ?

V2 = 20mL

Step 2: Write the formula and solve

PV = k

5 psi * 100 mL = k

k = 500 mL*psi

Page 8: U3f – L4 Solve these problems 1.A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

U3f – L4

Two 175 lb teachers stand on a block of wood with 50 in2 in area. What is the total pressure

Problem 2

Step 1: Write given information

P = ?

F = 175 lb x 2 = 350 lbs

A = 50 in2 Step 2: Write the formula and solve

P = F/A

P = 350lb/ 50 in2

P= 7 psi

Page 9: U3f – L4 Solve these problems 1.A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

U3f – L4

Your lungs have a volume 4000 mL when you breathe in and 1000 mL after you exhale. If the pressure when you breathe in is 15 psi, what is the pressure when you breathe out

Problem 3

Step 1: Write givn information

P1 = 15 psi

V1 = 4000 mL

P2 = ???

V2 = 1000 mL

Step 2: Write the formula and solve

P1V1 =P2V2

15 psi * 4000 mL = P2*1000 psi

60,000 mL*psi = P2 *1000psi

P2 = 60 psi

Page 10: U3f – L4 Solve these problems 1.A gas is compressed from a volume of 100 mL to a volume of 50 mL. The ending pressure is 2 psi. What was the starting pressure?

U3f – L4

The air in your tires has a pressure of 50 psi and a volume of 1,600 mL. If the pressure inside the tire decrease to 40 psi, what would the new volume be?

Problem 4

Step 1: Write givn information

P1 = 50 psi

V1 = 1600 mL

P2 = 40 psi

V2 = ??

Step 2: Write the formula and solve

P1V1 =P2V2

50 psi * 1600 mL = P2*V2

80,000 mL*psi = 40 psi *P2

P2 = 2000 mL


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