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A fan at a rock concert is 50.0{\rm m} from the stage, and at this point the sound intensity level is 109{\rm dB}. Sound is detected when a sound wave causes the tympanic membrane (the eardrum) to vibrate . Typically, the diameter of this membrane is about 8.40{\rm mm} in humans
Part A How much energy is transferred to her eardrums each second ?
Part B How fast would a 2.00{\rm mg} mosquito have to fly to have this much kinetic energy?
A shopper pushes a cart 50 m south down one aisle and then turns 90° west and moves 28 m. He then makes another 90° turn and moves 11 m.
A person's prescription for his new bifocal eyeglasses calls for a refractive power of -0.0650 diopters in the distance-vision part, find both the near point and the far point. It asks for both, not just one
a sinusoidal transverse wave moves along a stretched string in the +j direction with amplitude 5 cm, wavelength 2 m, and wave speed 200 m/s. How much average power is transmitted along the string
A sprinter of mass 63.7 kg runs at a constant speed of 10.8 m/s in a straight line. Find the extra force the sprinter must exert on the ground
A beam of light enters a cube of flint glass (n = 1.65) at a 24 degree angle from the normal. Calculate the exact angles the light travels at
spring stretches by 0.0186 m when a 3.24-kg object is suspended from its end. How much mass should be attached to this spring so that its frequency of vibration is f = 5.53 Hz
A fugitive tries to hop on a freight train traveling at a constant speed of 4.8. What is the distance traveled to reach the box car
Radioactive isotopes are often introduced into the body through the bloodstream. If the decay rate in the thyroid 24.0 d later is actually measured to be 17.0Bq , what percent of the tracer went to that gland
Two identical point charges (q = +6.95 10-6 C) are fixed at diagonally opposite corners of a square with sides of length 0.485 m. A test charge (q0 = -2.15 10-8 C), Determine the speed of the test charge
A solid sphere of uniform density starts from rest and rolls without slipping a distance of d = 4 m down a q = 25° incline. The sphere has a mass M = 4 kg and a radius R = 0.28 m. Illustrate what is the translationg kinetic energy
When at rest, two trains have sirens that emit a frequency of 300 Hz. The trains travel toward one another and toward an observer stationed between them. What is the speed of the second train
The company's basis in the inventory is $5,000. Explain how large a deduction is it allowed for this charitable contribution?
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