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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 28.7oC, 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.
Quadrupole moments in the shell model
Phonology: All the data for this problem come from a conservative dialect of Vèneto, a Romance language spoken in northern Italy near the city of Padua.
Charge is distributed with constant volume density D throughout the rectangular box with length a, width b and height c.
Find the Band Structure and Band Occupancy
Question: Field and force with three charges? What is the electric field at the location of Q1, due to Q 2 ?
Determine the tension in each string
A dockworker applies a constant horizontal force of 84.0\({\rm N}\) to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 12.5\({\rm m}\) in a time 4.80\({\rm s}\)
Question on center of gravity Discover speed of each block
Calculate the dc voltage applied to the circuit.
Evaluate maximum altitude?
What is the maximum displacement of the bridge deck?
Introductory Mechanics: Calculate the smallest coefficient of static friction
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