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Q. A man drops a rock into a well. He hears the sound of the splash 3.2 seconds after he releases the rock from rest. The speed of sound in air (at the local ambient condition) is 338 m/s.
(a) How far below the top of the well is the surface of the water? (round your answer to a whole number)
(b) If you ignored the travel time for the sound, what would have been the calculated depth? (round your answer to a whole number)
What fraction of the power radiated by the sun is intercepted by the planet Mercury? The radius of Mercury is 2.44 x 106 m, and its distance from the sun at the moment is 5.75 x 1010 m. presume that sun radiates uniformly in all directions.
A cord connected at one end to a block which can slide on an inclined plane has its other end wrapped around a cylinder resting in a depression at the top of the plane . Determine the speed of the block after it has traveled 1.80 along the plane, ..
Compute the horizontal distance the ball
A professor's office door is 0.90 wide, 2.00 high, 4.00 thick; has a mass of 30, and pivots on frictionless hinges. A "door closer" is attached to door and the top of the door frame. When the door is open and at rest, the door closer exerts the torqu..
A 51.0-g Super Ball traveling at 27.0 m/s bounces off a brick wall and rebounds at 21.5 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.75 ms,
A string of 22 identical Christmas tree lights are connected in series to a 125 V source. The string dissipates 52 W. What is the comparable resistance of the light string.
What is the frequency of light that has the wavelength in water of 788 nm if the refractive index for this light is 1.33.
A playground merry-go-round has a radius of 4.60 {rm m} and a moment of inertia of 250 kg m^2 and turns with negligible friction about the vertical axle through its center.
Use the binomial expansion to find an approximate expression
What velocity would a proton need to circle Earth 1400 km above the magnetic equator, where Earth's magnetic field is directed horizontally north and has a magnitude of 4 x10-8 T .
A 2.20 sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as heart beats. The reflected sound is after that mixed with the transmitted so..
A 65kg person throws a 0.0410 kg snowball forward with a ground speed of 28.0 m/s. A second person, with a mass of 60kg, catches the snowball. Both people are on skates.
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