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A person on a swing moves so that the chain is horizontal at the turning points. Show that the centripetal acceleration of the person at the low point of the arc is exactly 2 g, regardless of the length of the chain. This means that the force on the chains at the low point is equal to three times the person's weight.(Hint: The vertical distance between the turning point and the low point equals the length of the chain.)
one billiard ball is shot east at 2.15 ms. a second identical billiard ball is shot west at 1.42 ms. the balls have a
A uniform 5 kilogram ladder is leaning against a frictionless vertical wall, with which it makes a 15 degree angle. how massive a person would make the ladder slip
the current in an rl circuit builds up to one-third of its steady-state value in 3.80 s. find the inductive time
The distance to a point source is decreased with a factor of three. Suppose that the sound is emitted by the source uniformly in all directions. By what multiplicative factor does the intensity increase? By what additive amount does the intensity lev..
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 5.0 megawatt windmill has three 45 m-long blades that can be approximately viewed as straight rods. If the rotational speed of the rods is 6 rpm, what is the mass of each rod
Find the speed of light in each of the following materials: Polystyrene, Gallium phosphide, fused quartz
The fresh water behind a reservoir dam is 15.0 m deep. A horizontal pipe 3.00 cm in diameter passes through the dam 8.0 m below the water surface, What volume of water flows out of the pipe
what was the speed of the bullet at impact with block.
The figure shows an object and its image formed by a thin lens. Assume that L=15.0 cm and y=3.25mm. what is the focal length of the lens? what is the height of the image?
A 50 kg skateboarder wants to just make it to the upper edge of a "quarter pipe," a track that is one-quarter of a circle with a radius of 2.4 m. What speed does he need at the bottom
A 180 ib soldier had an accident: He fell down from a helicopterhoverin at 150 ft above a sno packed ground. evaluate the direction of this net acceleration
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