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How do you solve the following problem? How many moles of Na2SO4 are present in 150.0 mL of a 0.124 M solution? How many moles of Na+ ions are present? How many moles of SO4-2 ions are present?
A spring with spring constant 14 hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. It is then pulled down 3.0 and released. The ball makes 17 oscillations in 16 seconds. What is it the mass of ball.
A certain automobile engine is performing work at the rate of 33900 W (45 hp) with an efficiency of 27%
A 2 kg block is dropped from 45 cm above a spring. If the spring compresses 5 cm when struck by the block, What is its spring constant
a spring is pressed against a wall so that it is compressed by 0.25 m (ie it is 0.25 m shorter than its equilibrium length). what is the speed at which the spring leaves the wall
A 10m long bar is attached by a hinge on a wall and held horizontal with a rope that makes an angle of 49 degrees from the bar. The bar is uniform and weighs 80N. How far from the hinge must a 10 kg mass be suspended for the tension in the rope to be..
A bug starts at the origin of the xy coordinate system with an initial velocity of (2.2 + -0.4) m/s, What is the y position of the bug at t=2 seconds
A hoop and a disk, both of 0.76- m radius and 3.0- kg mass, are released from the top of an inclined plane 3.0 m high and 7.0 m long. determine the speet of the hoop and disk
In order for the turbines to work most efficiently the water should enter them at a speed of 20 m s -1. In order to achieve this the pipe narrows to what radius just before it enters the turbines?
The electron moves through the region in a corkscrew pattern. The radius of the corkscrew path is 0.15m while the pitch is 0.05m. What is the velocity of the electron?
A golf ball is driven from a level fairway. At a time of 5.32 s later, the ball is traveling downward with a velocity of 55.2 m/s at an angle of 26.0° below the horizontal. Neglecting air resistance, calculate the initial velocity (magnitude and dire..
A wooden block of mass 29.0 kilogram sits on a horizontal table. Find what is the coefficient of static friction between block and table
Assume that a loudspeaker broadcasts sound equally in alldirections and produces sound with a level of 109 dB at a distance of 1.66m from the center. Find its sound power output
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