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Question: A dam stands 12 ft high. It is 4 ft wide at the top and 10 ft wide at the base. The upstream face is vertical. The coefficient of friction between the darn and its foundation is 0.6. What are the factors of safety against sliding and overturning when the water has reached the top of the darn? The dam is made of concrete (density = 150 lb/ft3).
Radium decomposes radioactively to form radon (atomic number 86, which is also the number of protons in the nucleus) by emitting an alpha-particle from its nucleus, What is the acceleration of the alpha-particle at this distance
A jet is circling an airport control tower at a distance of 18 km. An observer in the tower watches the jet cross in front of the moon. Find the distance traveled (in meters) by the jet
An amusement park ride consists of a rotating circular platform 8.00 meter in diameter from which 11.0 kilogram seats are suspended at the end of 2.50 meter mass less chains. Determine the speed of each seat
A 130 horizontal beam is supported at each end. A 310 piano rests a quarter of the way from one end. What is the vertical force on each of the supports
A lens that has an index of refraction of 1.61 is coated with a non-reflective coating that has an index of refraction of 1.45. Determine the minimum thickness for the film if it is to be non-reflecting for light of wavelength 5.60 x 102 nm.
a 100 incandescent light bulb has a cylindrical tungsten filament 33.0 long 0.430 in diameter and with an emissivity of
A softball pitcher throws an underhanded pitch with the arm fully extended (straight at the elbow). What force did the muscles exert to cause the arm to rotate
If a 1500 kilogram vehicle stopped from an in 5.6 s with an applied force of 5000 Newton, determine how fast was it initially traveling
A skier is gliding along at 3.6 m/s on horizontal, frictionless snow. He suddenly starts down a 10 degree incline. His speed at the bottom is 17 m/s. What is the length of the incline
A horizontal circular platform rotates counterclockwise about its axis at the rate of 0.875 rad/s. You, with a mass of 72.3 kg, Calculate the total angular momentum of the system.
A particle in initially moving along the positive x-axis at a speed of 10.0 m/s. Find the x and y components of the particle's acceleration
Find the speed an alpha particle requires to come within 2.6 ? 10-14 m of a uranium nucleus
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