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When one person shouts at a football game, the sound intensity level at the center of the field is 68.4 dB. When all the people shout together, the intensity level increases to 101 dB. Assuming that each person generates the same sound intensity at the center of the field, how many people are at the game?
Consider the following pipe assembly containing a permeable filter of length L=20cm, area A=20cm^2, and permeability of 4 millidarcys. what is the velocity of the flow through the filter section
A refracting telescope is used to view the Moon (diameter 3480 km, distance from Earth 385,000 km). What should be the distance between the lenses
One mole of a monatomic gass initially at 273 K and 1 atm is compressed isothermally (T constant) from volume 22.4 L to 11. 4 L, Find the final pressure and draw a PV diagram, Labeling the initial and final states 1 and 2
A 330g airtrack cart on a horizontal air track is attached to a string that goes over a pulley with a moment of inertia of 5.00*10^-6 kg*m^2 and a radius of 1.35 cm. Write newtons second law for each of the three objects
A runner moving at a constant speed of 11.7 m/s rounds a curve of radius 4.10 m. calculate the acceleration of the runner. (State the magnitude of this acceleration.)
A parallel plate capacitor of capacitance 4.3 µF has the space between the plates filled with a slab of glass with ? = 3.9. Find the capacitance after the glass is removed
Weak background noises from a room set up the fundamental standing wave in a cardboard tube length of 67.0 cm with two open ends. what fundamental frequency do you hear from the tube
Of the charge Q initially on a tiny sphere, a portion q is to be transferred to a second, For what value of q/Q>0.5 will the electrostatic force between the two parts have 1/2 of the maximum possible value
A parallel plate capacitor is constructed with Teflon (dielectric constant 2.1) between the plates. What charge was originally stored
Air is confined at atmospheric pressure (101.3 kPa) in a cylinder whose volume is 0.22 m3. Calculate the increase in internal energy of the air
q1. a 9300 kg boxcar travelling at 23 ms strikes a second boxcar at rest. the two stick together and move off with a
A rifle with a weight of 35 N fires a 3.0-g bullet with a speed of 230 m/s. Find the recoil speed of the rifle
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