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Two identical rollers are mounted with their axes parallel, in a horizontal plane, a distance 2d = 23.6? cm apart. The two rollers are rotating inwardly at the top with the same angular speed ?. A long uniform board is laid across them in a direction perpendicular to their axes. The board of mass m = 3.52 kg is originally placed so that its center of mass lies a distance x0 = 10 cm from the point midway between the rollers. The coefficient of friction between the board and rollers is ?k = 0.653. What is the period (s) of the motion?
A rock of mass 42 kg accidentally breaks loose from the edge of a cliff and falls straight down. What is the magnitude of the acceleration of the rock
A solid disk rotates in the horizontal plane at an angular velocity of 0.049 rad/s with respect to an axis perpendicular to the disk at its center. what is the angular velocity of the disk
A rectangular building lot has a width of 61.5 ft and a length of 119 ft. Determine the area of this lot in square meters
A square loop 10cm on a side carries a current I' = 1A, and is placed 10cm away from a long,straight wire of current I = 10A, Calculate the net force on the loop
What is the current in the wire.
Light of wavelength 5.10 multiply.gif 102 nm passes through a slit of width 0.210 mm. Determine the width of the first-order bright fringe
A 0.15g honeybee acquires a charge of 21pCwhile flying, What is the ratio of the electric force on the bee tot he bee's weight and What electric field strength and direction would allow the bee to hang suspended in the air
An aircraft weighing 803 N is accelerated at 10 m/s2 for 9 seconds, at which time the aircraft launches. How much work was done on the aircraft
The man hears the sound of the splash 2.8 s after he releases the rock from rest. The speed of sound in air (at the ambient temperature) is 336 m/s. How far below the top of the well is the surface of the water
A playground is on the flat roof of a city school, 5 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, Find the speed at which the ball was launched
A single conservative force F(x) acts on a 2.9 kg particle that moves along an x axis. The potential energy U(x) associated with F(x) is given by U(x) = -3.8xe^-x/5, What is the mechanical energy of the system
Two concentric metal spheres are found to have a potential difference of 646.0 V when a charge of 2.816·10-8 C is applied to them. The radius of the outer sphere is 0.188 m. What is the radius of the inner sphere?
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