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A speaker at an open-air concert emits 600 W of sound power, radiated equally in all directions.
A) What is the intensity of the sound 5.50 m from of the speaker?
B) What sound intensity level would you experience there if you did not have any protection for your ears?
C) Earplugs you can buy in the drugstore have a noise reduction rating of 23 decibels. If you are wearing those earplugs, but your friend Phil is not, how far from the speaker should Phil stand to experience the same loudness as you?
A wheel starts from rest and rotates about its axis with constant angular acceleration. What is the angular acceleration of the wheel
A force platform is a tool used to analyze the performance of athletes measuring the vertical force that the athlete exerts on the ground as a function of time. With what speed did she reach the platform
A rod is being used as a lever, as shown in the figure below. The fulcrum is x1 = 1.79 m from the load and x2 = 3.81 m from the applied force. If the load has a mass of 12.8 kg, what force must be applied to lift the load?
define the hazards for astronauts inside any spacecraft moving in the vicinity of a pulsar.
A certain loudspeaker system emits sound isotropically with a frequency of 2290 Hz and an intensity of 0.795 mW/m2 at a distance of 5.43 m. Assume that there are no reflections.
A copper pipe with an outer radius of 0.014 m runs from an outdoor wall faucet into the interior of a house. Find the inner radius of the pipe
(a) Calculate the index of refraction of the polymer if the refracted angle is 26 degrees. (b) Calculate the critical angle of the polymer in air. (c) Calculate the speed of light in the polymer.
What is an average acceleration of the dragonfly
Two sleds are hooked together in tandem . The front sled is is twice as massive as the rear sled. Determine the ratio of the magnitude of the two forces.
It is found experimentally that the electric field in a certainregion of Earth's atmosphere is directed vertically down. At analtitude of 260 m the field hasmagnitude 60.0 N/C. At an altitude of 190 m, the magnitude is 100 N/C.
A cubic meter of some material has a mass of 5200 kg. Find the buoyant force on the block and the tension in the cable
An object initially displaced 75.25 m (along the horizontal x direction) has in initial velocity downward (along the -y direction) of 57.28 cm/s. Assuming that the object is on Neptune which has an average acceleration of gravity of 11.15 m/s2, deter..
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