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A typical adult ear has a surface area of about 1.90 10-3 m2. The sound intensity during a normal conversation is about 3.60 10-6 W/m2 at the listener's ear. Assume the sound strikes the surface of the ear perpendicularly. How much power is intercepted by the ear?
________ W
A 25-g string is streched with a tension of 43.0 N between two fixed points 12.0 m apart. What is the frequency of the second harmonic
A 110 g copper calorimeter cup contains 190 cm3 of water and 45 g of ice, all in thermal equilibrium. find the mass of water before the hot iron is put into the cup
A beam of electrons passes by a single slit and a beam of protons passes by a second, but identical slit. If the electrons and protons have the similar speed, that beam would experience the greatest amount of diffraction? Clarify your answer.
For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air. determine the recoil velocity
A 1.7kg , 20-cm-diameter turntable rotates at 50rpm on frictionless bearings, What is the turntable's angular velocity, in rpm, just after this event
A child is pushing a merry-go-round. The angle through which the merry-go-round has turned varies with time according to ?(t)=?t+?t3, What is the initial value of the angular velocity
A 0.24 meter stick balances at its center. If a necklace is suspended from one end of the stick, the balance point moves 8 toward that end. Is the mass of necklace more than, less than, or the same as that of the meter stick.
A wrench 0.500m long is applied to a nut with a force of 80.0 N.
Calculate the number of bright fringes per centimeter. At what two locations on x-axis (xpositive, xnegative) is the potential zero.
Dan is gliding on his skateboard at 2.0 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.0 m/s. How fast is Dan going as his feet hit the ground? Dan's mass is 60 kg and the skateboard's mass is 5.0 kg.
A proton moves at 4.9x106 m/s in a magnetic field where B = 0.42 T. what force does the proton experience
The man hears the sound of the splash 2.8 s after he releases the rock from rest. The speed of sound in air (at the ambient temperature) is 336 m/s. How far below the top of the well is the surface of the water
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