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A hunter is standing on flat ground between two vertical cliffs that are directly opposite one another. He is closer to one cliff than the other. He fires a gun and, after a while, hears three echoes. The second echo arrives 1.39 s after the first, and the third echo arrives 1.13 s after the second. Assuming that the speed of sound is 343 m/s and that there are no reflections of sound from the ground, find the distance (in m) between the cliffs.
The barricade at the end of subway line has a large spring designed to compress 2.00 m when stopping a 1.00 x 10^5 kg train moving at 0,500 m/s. What speed would the train be going
There is evidence that elephants communicate via infrasound, Determine the intensity level of the infrasound 10 km from the source, assuming the sound energy radiates uniformly in all directions
A ball is thrown directly downward with an initial speed of 8.50 m/s, from the height of 29.5 m. After what time interval does it strike the ground.
Interpreting attenuation as a reflection loss calculate the lower limit to the effective reflectivity at the core cladding boundary
The frequency doubled output of a Nd3+ YAG laser has a wavelength of 532nm. how many photons does the laser emit at 532nm in 3 minutes
a 20 kg mass sits on an inclined plane with friction making an angle of 50 degrees with respect to the horizontal. calculate the frictional force required to keep the mass from sliding down the incline
A woman with mass 50 kg stands at the rim of a large disk rotating at 0.5 rev/s about its center axis. What is the difference in energy of the system
A tunnel of length L = 146 m, height H = 7.7 m high, and width 5.7 m (with a flat roof) is to be constructed at distance d = 60 m beneath the ground, What is the total weight of the ground material the columns must support
A 0.500 kg hammer is moving horizontally at 6.50 m/s when it strikes a nail and comes to rest after driving it 1.00 cm into a board. Calculate the duration of the impact
The skis have a thrust of 190 . Sam's speed at the bottom is 35.0 . Illustrate what is the coefficient of kinetic friction of his skis on snow?
Identical conducting spheres
A defibrillator passes a brief burst of current through the heart to restore normal beating. In one such defibrillator, What is the initial current through the patient
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