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A 0.26-kg stone is held 1.2 m above the top edge of a water well and then dropped into it. The well has a depth of 4.5 m. Relative to the configuration with the stone at the top edge of the well, what is the gravitational potential energy of the stone-Earth system before the stone is released.?
A sphere, a solid cylinder and a thin-walled hollow cylinder all have the same mass and radius. Which one reaches the bottom of the incline first
Block A weighs 19.9 lb and is moving toward the left with a velocity of 4 ft/s just before it is struck by the bullet B from a caliber 50 machine gun. The coefficient of kinetic friction between A and the plane is 0.25. The bullet weighs 0.10 lb a..
Four force vectors act simultaneously on a 65 kg object. Force One is 211 N West, Force Two is 193 N at an angle 28.0 degrees north of west, What is the magnitude of the final acceleration of the object
a cosmic ray particle travels directly over a football field from one goal line to the other at a speed of 0.454c.a. if
If you treat an electron as a classical spherical object with radius 2.00×10?17 m, what angular speed is necessary to produce a spin angular momentum of magnitude sqrt3/4h, calculate the speed of a point at the electron's equator
We have a typical student microscope with a rotating platform that allows the user to select from three objective lenses. calculate the highest and lowest magnitude of the overall angular magnifications available
A wire of resistance 9.0 is connected to a battery whose emf script e is 5.0 V and whose internal resistance is 1.0. How much energy appears in the wire as thermal energy in that time
A simple pendulum has a period of 3.74 s. The acceleration of gravity is 9.8 m/s^2 What is its length? What would its period be on the Moon
Suppose a muon produced as a result of a cosmic ray colliding with a nucleus in the upper atmosphere has a velocity v = 0.9500c. What distance is this in the muon's frame
a solid disk of mass m and radius r is pivoted so that it can rotate about its center. the disk is initially at rest. a
A woman pushes a 25 kilogram lawn mower, If F=30 Newton and θ=37o, Determine the acceleration of the mower, and Find the normal force exerted on the mower by the lawn
A sample has a activity of 0.0021 Bq per gram of carbon. Find the age of the sample, assuming that the activity per gram of carbon in a living organism has been constant at a value of 0.23 Bq
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