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A microphone in the ocean is sensitive to sounds emitted by porpoises. To produce a usable signal, sound waves striking the microphone must have an intensity of 10.7 dB. If porpoises emit sound waves with a power of 0.0491 W, how far can a porpoise be from the microphone and still be heard? Disregard absorption of sound waves by the water.
A bug is hovering in the air (v=0) when a heavy automobile, moving at 20 m/s, suddenly collides with it. what is the bug's speed after the collision
the current in a 30 meter wide river is 3 m/s towards the north. If you need to move straight across the river, how far downstream do you reach the shore
What is the net force of a 2.0 N force and an 6.0 N forceacting on an object for each of the following conditions? The forces act in opposite directions.-------N
Given the moon's period about the earth is 27.32 days and the earth-moon distance is 3.84 x 108 meter, compute the mass of the earth
A sky diver with an open parachute approches the ground with constant velocity. There is no wind to blow him fromside to side. Which statement is correct? An object is moving at a constant velocity. Whichstatement has to be false?
A water pipe having a 2.96 cm inside diameter carries water into the basement of a house at a speed of 0.804 m/s, find water pressure and speed at the second floor
Describe in 100 words or less how electromagnetic theory has influenced or affected today's world society
multiple-Concept Example 11 deals with a situation that is similar, but not identical, to that here. When 4710 J of heat are added to a 0.261-m-long silver bar, What is the mass of the bar
Where must an object be placed to form an image 28.8 cm from a diverging lens with a focal length of 45.0 cm, Determine the magnification of the image
What is the velocity of the rocket when it runs out of fuel.
a hydroelectric turbine generator produces an electric power of 20 mwmegawatts. water enters the turbine penstock at
A hollow wire of outer radius 10 cm and inner radius 5 cm carries a uniformly distributed 12 Amp current. Discover the value of the magnetic field at a) r= 6 cm and b) r= 20 cm. (use ampere slaw)
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