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A long uniform wooden bar with square crosssection floats on water. Show that , if the relativedensity of wood is 0.50, the bar will float with all fourfaces making an angle of 45 degrees with the water surface. ( Hint : The bar floats in theequilibrium position for which the potential energy is a minimum.)
A diffraction grating produces a first-order maximum at an angle of 25.0 degree. What is the angle of the second-order maximum
A pilot flies her route in two straight-line segments. The displacement vector A for the first segment has a magnitude of 242 km, find the directional angle
A 10 nC point charge is at the center of a 2.0m x 2.0m x 2.0 mcube. What is the electric flux through the top surface of the cube
A 2150 kg truck is traveling east through an intersection at 1.5 m/s when it is hit simultaneously from the side and the rear. What are their speed and direction just after the collision
A rocket traveling 1850 m/s away from the Earth at an altitude of 6800 km fires its rockets, at what rate must the gases be ejected
Explain how to determine the total resistance of a parallel and a series circuit. How does total resistance affect the current in each type of circuit
A dart is thrown horizontally with an initial speed of 16 m/s toward point P, the bull's-eye on a dart board. It hits at point Q on the rim, How far away from the dart board is the dart released
Three dogs are pulling on a blanket in different directions. The English shepherd is pulling north with a force of 40 N. in what direction is the boxer pulling
Two cylindrical bars, each with diameter of 2.30 cm, are welded together end to end. One of the original bars is copper and is 0.350 m long
Positive electric charge is distributed in the shape of an infinitely long insulating cylinder of radius R and volumetric charge density ?=?0(1-r/R), Find an expression for the linear charge density
A coil of wire with 110 turns is wrapped in a circular shape with a radius of 29 cm. The plane of the coil is perpendicular to a magnetic field of magnitude 2.0 T. What is the cross sectional area of the coil
A 132- (including all the contents) rocket has an engine that produces a constant vertical force (the thrust) of 1930. Find the acceleration of the rocket
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