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A 5 kilograms box is pushed across a horizontal floor by a 20 Newton force that is angled 30o below the horizontal. Obtain the coefficient of kinetic friction between box and floor if the box is pushed at a constant speed?
A solenoid is 1.6 m long and has 530 turns per meter. what is the cross sectional area of this solenoid if it stores .31 J of energy when it carries I=14A
a loudspeaker at a concert generates 2.00x10-2 wm2 at a distance of 25.0m and all the acoustic energy is radiated
A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor and that its period is 27.5 s. How tall is the tower
The world consumes energy at the rate of about 456 per year, where the joule is the SI energy unit. estimate the average per capita energy consumption rate in watts
Light Bulbs in Series and in Parallel. Two light bulbs have resistances of 500 ? and 1000 ?. The two light bulbs are connected in series across a 110 V line. (a) Find the current through the 500 ? bulb. A Find the current through the 1000 ? bulb. ..
A football is kicked at ground level with a speed of 40 m/s at an angle of 32.0 degrees to the horizontal. How much later does it hit the ground
An incompressible fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 4.00 cm.
If the diameter of the fifth circular orbit of the hydrogen atom is 26.5 A, what is the frequency of the reveloution
at any instant the horizontal position of a weather balloon is defined by x30t ft where t is given in seconds. if the
A 69-g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.5 ms. The ball rebounds elastically, and returns to its original height. The time interval for a round trip is..
A block with a mass of 10.0 g and a charge of +1.11 x 10-5 C is placed in an electric field with x component Ex = 2.51 x 103 N/C, y component Ey = -528 N/C, find the magnitude of the electrostatic force on the block
a 50.0 kg student climbs a 5.00 m long rope and stops at the top, how much work does she do
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