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The 16-lb shaft shown has a uniform cross section. Knowing that the shaft rotates at the constant rate ω= 12 rad/s, determine the dynamic reactions at A and B.
A point charge of +6 μC is located at x = −2 cm, and a second point charge of −8 μC is located at x = 1 cm. Where must a third charge of +2 μC be placed so that the electric field at x = 0 cm is zero?
A 45% efficient device uses chemical energy to generate 420 J of electric energy. How much chemical energy is used? A second device uses twice much chemical energy to generate half as much electric energy. What is its efficiency?
An excellent laboratory vacuum has a pressure of 5.00 x 10-18 atm, or 5.05 x 10-13 Pa. How many gas molecules are there per cubic centimeter
a horizontal wire is hung from the ceiling of a room by two mass less strings. the wire has a length of 0.20 m and a
A string trimmer is a tool for cutting grass and weeds; it utilizes a length of nylon "string" that rotates about an axis perpendicular to one end of the string. What is the length of the rotating string
In the x-y plane, a charge of -4.6 microcoulombs is on the x-axis at the point (-30cm,0cm), calculate the magnitude and direction of the resultant electric field E at the origin (0cm,0cm)
When the book has come to rest, how does the decrease in mechanical energy of the book-Earth system compare with that when the book slid over the horizontal surface
An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. evaluate the electric field between the plates
Suppose a ball leaves the ground upward at an angle of 45 degree to the horizontal, with an initial speed of 14.14m/s, What is the maximum height reached by the ball
A 0.423 kilogram block of wood hangs from the ceiling by a string, and a 0.0692 kilogram wad of putty is thrown straight upward, Find how high does the putty-block-system rise above the original position of the block
Three point charges are positioned on the x-axis: +117.0 uC at x = 0.00 cm, +106.0 uC at x = 40.0 cm, and -20.0 uC at x = 30.0 cm. What is the magnitude of the electrostatic force
A very hard rubber ball (m = 0.7 kg) is falling vertically at 9 m/s just before it bounces on the floor. find the average force exerted by the floor on the ball
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