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Q. A small block on a frictionless, horizontal surface has a mass of 2.80×10-2. It is attached to a massless cord passing through a hole in the surface. The block is originally revolving at a distance of 0.300 from the hole with an angular speed of 1.95. The cord is after that pulled from below, shortening the radius of the circle in which block revolves to 0.15. Model the block as a particle.
A 300 kg piano slides 4.50 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.
A 64 woman stands on a very light, rigid board that rests on the bathroom scale at each end. 1.5 m left of her and 2.0m total. what is the reading on each of the scales.
A gun shoots bullets that leave the muzzle at 213m/s. If a bullet is to hit a target 160.4m away at the level of the muzzle, the gun must be aimed at a point above target. (Neglect air resistance.)
A diver of weight 780 N stands at the end of a diving board of length L = 5 m and negligible mass. The board is fixed to two pedestals separated by distance d = 1.5 m
A block of the same weight as the meter stick is suspended from the stick, as shown, at a distance x from the wall. What is the minimum value of x for that the stick will remain in equilibrium.
A runner moving at a constant speed of 11.7 m/s rounds a curve of radius 4.10 m. calculate the acceleration of the runner. (State the magnitude of this acceleration.)
What is the speed of the block while the spring is till now compressed by xf=0.14m.
A mass of 1.62 kg stretches a vertical spring 0.328 m. If the spring is stretched an additional 0.136 m and released, how long does it take to reach the (new) equilibrium position again.
A uniform steel beam has a mass of 1640 kg. On it is resting half of an identical beam. What is the vertical support force at each end.
A particular freely falling object requires 1.95 s to travel the last 33.5 m before it hits the ground. From what height above the ground did it fall.
A very large number (N+1) polaroids are arranged in a sandwich.
Rare 1918 "Jenny" stamp, depicting a misprinted, upside-down Curtiss JN-4 "Jenny" airplane, was sold at auction for $525,000. A collector uses a simple magnifiying glass to examine the "Jenny," obtaining a linear magnification of 2.4 when the stam..
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