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You are at a rock concert, and the sound intensity reaches levels as high as 100 dB. The sounds pressure produces an oscillating force on your eardrum. The area of the ear drum is 65 mm^2. Calculate the amplitude of this oscillating force.
Assume a car's brakes can produce an acceleration of -7 m/s2. If the car is travelling at an initial speed of 28.0m/s, what is the minimum distance necessary to stop car.
A 2 meter wire carrying 0.9 A of current is at a 90 degree angle to a magnetic field. compute the strength of the field
A box is pushed across the floor, slide with a constant velocity, and is opposed by a friction force of 25N. What is the magnitude of the force? Choose the correct answer. A.Less than 25N B.Zero C.Greater than 25N D.25n
A 4.0mW laser beam has its electric field vertical. what's the power of the transmitted beam
The frequency of a tuning fork is 358 Hz. Find the length of the shortest organ pipe which will give 6 beats/s with the fork. The velocity of sound in air is 339.1 m/s.
Photons of wavelength 490 nm are incident on a metal. What is the work function of the metal
A typical person radiates about 62 W of power at room temperature. Given this result, how long does it take for a person to radiate away the energy obtained by consuming a 230-calorie doughnut.
A string with a mass of 31 g and a length of 2 m is stretched under a tension of 67 N. How much power must be supplied to the string to generate a traveling wave that has a frequency of 51 Hz and an amplitude of 4 cm.
A signal starts at x point. As it travels to y point it loses eight db. At point y the signal is boosted by ten db. As the signal travels to point z it loses 7 db.
A sample of helium behaves as an ideal gas as it is heated at constant pressure from 273 K to 343 K. what is the mass of helium present
How far away from the people is the plane.
Write down an equation for the radial component
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