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A certain sound has an intensity of 8.474275 x 10-4 W/m2 2.33 m from its source. What is the power emitted by this source in watts? Express your result to three significant digits and in scientific notation.
how long does an organ pipe have to be if it is closed at one end open at the other and has a fundamental frequency of
The water in the plumbing in a house is at a gauge pressure of 260,000 Pa. Obtain what force does this cause on the top of the tank inside a water heater
The current indoor world record time in the 200-m race is 19.92 s, held by Frank Fredericks of Namibia (1996), Find the mean speed in meters per second corresponding to the record time for the 200-m event
The intensity of an electromagnetic wave is 8 × 107 W/m2. What is the amplitude of the magnetic field of this wave
a string of mass 0.030 kg and length 5.00 m is attached to the wall on one side. on the other side a 2.00 kg mass is
Two runners approaching each other on a straight track haveconstant speeds of 4.50m/s and 3.50m/s, respectively, whenthey are 100m apart. How long will it take for the runners tomeet, and at what position will they meet if they maintain these speeds?
a person scuffing her fee on a dry day accumulates a net charge of -42 uc. how many excess electrons does she get and
a spherical mirror is polished on both sides. when the concave side is used as a mirror the magnification is 2.0. what
a buckey ball is a large molecule comprised of 60 carbon atoms arranged in a shape something like a hollow sphare
a 10 kg hollow cylindrical shell rolls on the ground at a linear velocity of 5m/s. its diameter is 50 cm. what is its total kinetic energy
two equally charged insulating balls each weigh 0.42 g and hang from a common point by identical threads 40 cm long.
A cannonball (20kg) is shot from a cannon(200kg) with a velocity of 20m/s. what is the backwards velocity of the cannon
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