What portion of jet power lost to producing sound

Assignment Help Physics

Reference no: EM133614

Question1

A 25MW Jet engine produces a sound level of 120dB, threshold of pain at a distance of 100m from the engine Recall the threshold of human hearing is 1 * 10^(-12)W/m^2

a)What portion of jet power is lost to producing this sound?

b) You are at your silent summer house (40dB) and you can just hear the sound of the smae jet engine at the airport. How far away is your house from the airport?

c) Is result of your simple calculation reasonable?

Question2

Powdered steel is placed in a container filled with oxygen and fitted with a piston that moves to keep the pressure in a container constant at one atmosphere. A chemical reaction occurs that produces heat. To keep contents at a constant temperature of 28.7^oC, it is needed to remove 5.51083 × 10^5J of heat from container as it contracts. During the chemical reaction, it is found that 1.8 mol of oxygen is consumed. Find the internal energy change for the system of iron and oxygen. The universal gas constant is 8.31451 J/K mol.

Reference no: EM133614

Questions Cloud

What is current temperature and peak wavelength : What is current temperature and peak wavelength What is the proper description of their situation

Distinguish between the terms vision and mission : Distinguish between the terms Vision and Mission Briefly describe Porter's Generic Strategies

Direction of the surface winds : Direction of the surface winds What is the expected composition

The change in the kinetic energy of the system : The change in the kinetic energy of the system

What portion of jet power lost to producing sound : What portion of jet power lost to producing sound Powdered steel is placed in a container

Question on center of gravity : Question on center of gravity Discover speed of each block

Activities offered by kaiser outdoors : the factors that motivate individuals to participate in outdoor recreation, two local outdoor recreation sites, Outdoor recreation is any form of experience followed during leisure time in which an individual engages from choice because of personal ..

Outdoor recreation : Recreation Opportunity Spectrum, contribution of outdoor recreation to the local community, nature-based recreation site, natural environment of the site,

Purchaser satisfaction for its target markets : Recreation Opportunity Spectrum, contribution of outdoor recreation to the local community, nature-based recreation site, natural environment of the site,

User Account

All Pages