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Please answer both parts A and B.
A) The decibel level of the noise from a jet aircraft is 130 dB when measured 16.8 m from the aircraft. How much sound power does the jet aircraft emit? Answer in units of W.
B) How much sound power would strike the eardrum of an airport worker 16.8 m from the aircraft? Assume the diameter of the worker’s eardrum is 1.7 × 10?2 m. Answer in units of W.
290 Kg piano slides 4.0 m down a 30 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is .40.
A 650-N Marine in basic training climbs a 11.5-m vertical rope at a constant speed in 9.50 s. What is his power output
Consider an elevator that is hanging from a strong cable. The elevator is initially at rest. It then accelerates upwards for 2 seconds, due to the cable pulling. It then then slows down, still moving upwards, until it comes to a stop. Pick out any..
it's nighttime, and you've dropped your goggles into a swimming pool that is 3.2 m deep. How far are the goggles from the edge of the pool
Light of wavelength 730 nm illuminates a pair of slits separated by 0.200 mm. determine the distance between the first and second dark fringes
Two blocks, each of mass m = 2.4 kg, are pushed along the horizontal surface of a table by a horizontal force P of magnitude 4.7 N, Find the frictional force acting on the upper block
An object is in front of a converging lens (f = 0.370 m). The magnification of the lens is m = 3.60. Through what distance should the object be moved
A glass window pane is exactly 20 cm by 36 cm at 10oC. By how much has its area increased as it temperature is 33oC, assuming that it can expand freely? Take the coefficient of thermal expansion for the glass to be exactly 9 x 10-6/Co.
A student sees a newspaper ad for an apartment that has 1830 square feet (ft2) of floor space. How many square meters of area are there
the number of radioactive nuclei present at the state of an experiment is 2.78e15. the number present twenty days later is 5.14e14. what is the half life in days of the nuclei
How much force is the air exerting on the front cover of a book that is 23.9 cm long and 16.9 cm wide
A golf ball with mass m = 0.07 kg is tied to a massless string of length L = 0.6 m. What the magnitude of the tension in the string
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