Columbia Southern University Fire Dynamics & Atmospheric Pressure Homework

Content Type

User Generated

User

onqqrfgwvgf1

Subject

Mathematics

Description

Calculate the mass loss rate for the fuel of a pool fire that has gone from having a mass of 75 grams at = to having a mass of 15 grams at t = 70 s.
Calculate the mass loss rate for the fuel of a pool fire that has gone from having a mass of 60 grams at = to having a mass of 20 grams at t = 45 s.
Calculate the mass loss rate for the fuel of a pool fire that has gone from having a mass of 45 grams at = to having a mass of 5 grams at t = 85 s.

The room has a gas pressure of 50 ft³ and is changed from the initial pressure of 14.7psi (1 atm) to 400psi. What would be the maximum pressure raised in the room? There is a book example located on page 54, and conversions are needed.
A compartment measures 10 feet by 10 feet by 2 feet with no openings. If the temperature in that room was to rise 450°F, and the initial pressure is 14.7psi (1 atm), what would the maximum pressure raised in the compartment be? What are the concerns with this increased pressure? There is a book example located on page 54, and conversions are needed.
When a gas at atmospheric pressure occupies a volume of 300 mL at 10°C, what volume does it occupy at 200°C and the same pressure?
At atmospheric pressure, a gas occupies a volume of 450 L at 0°C. What volume does it occupy at 100°C and the same pressure?

After periodic usage, the vehicle tire gauge pressure reads 45psig when the temperature is 72°F. What is the gauge pressure reading when the temperature of the tire contents becomes 125°F during a fire? There is a book example located on page 56, and conversions are needed.
The delivery driver delivers a gas cylinder and chains it to a wall within the shop. After periodic usage, the gauge pressure reads 215 psig when the temperature is 55°F. What is the gauge pressure reading when the temperature of the cylinder contents becomes 400°F during a fire? The initial pressure is 14.7psi (1 atm). There is a book example located on page 56, and conversions are needed.
A volume gas at atmospheric pressure occupies a volume of 150 mL at 5°C. What volume does it occupy at 150°C and the same pressure?
An unknown gas at atmospheric pressure occupies a volume of 600 mL at 15°C. What volume does it occupy at 300°C and the same pressure?

Tags: atmospheric pressure gauge pressure gas pressure mass loss rate Fire dymanics

User generated content is uploaded by users for the purposes of learning and should be used following Studypool's honor code & terms of service.

Explanation & Answer

here is final solution sheet

Q1. Calculate the mass loss rate for the fuel of a pool fire that has gone from having a
mass of 75 grams at = to having a mass of 15 grams at t = 70 s
Solution
Mass loss rate = −

dm
75 − 15
60
6
=−
=−
=−
dt
70 − 0
70
7

Q2. Calculate the mass loss rate for the fuel of a pool fire that has gone from having a
mass of 60 grams at = to having a mass of 20 grams at t = 45 s.
Solution
Mass loss rate = −

dm
60 − 20
40
8
=−
=−
=−
dt
45 − 0
45
9

Q3.Calculate the mass loss rate for the fuel of a pool fire that has gone from having a
mass of 45 grams at = to having a mass of 5 grams at t = 85 s.
Solution
dm
45 − 5
40
8
=−
=−
=−
dt
85 − 0
85
17
-------------------------------------------------------------------------------...