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You hold a ruler that has a charge on its tip 2 cm above a small piece of tissue paper to see if it can be picked up. The ruler has -16 µC of charge. The tissue has 1 g of mass. What is the minimum charge required to pick up the tissue paper?
How many electrons must be removed from each of two 4.4-kg copper spheres to make the electric force of repulsion between them equal in magnitude to the gravitational attraction between them?
Two identical positive charges exert a repulsive force of 6.2 x10-9 N when separated by a distance of 3.6 x10-10 m. compute the charge of each.
Four point charges have the same magnitude of 2.53 x 10^-12 C and are fixed to the corners of a square that is 4.15 cm on a side. Three of the charges are positive and one is negative. Determine the magnitude of the net electric field that exists ..
The pressure in the fluid at the distance from the axis of rotation is. You may ignore the variation in pressure with depth; suppose that it is much smaller than the variation in pressure with radius.
Two particles moving under the influence of their mutual gravitational force describe circular orbits about one another with a period T. If they are suddenly stopped in their orbits and allowed to gravitate towards each other, show that they would..
The electric field everywhere on the surface of a thin, spherical shell of radius 0.785 m is of magnitude 850 N/C and points radially toward the center of the sphere. (a) What is the net charge within the sphere's surface? Please show work.
The mass of a space shuttle is approximately 2.0x10^6 kg. Throughout lift-off, the net force on the shuttle is 1.0x10^7 newtons directed upward. What is the speed of the shuttle 10 seconds after liftoff.
Oppositely charged parallel plates are separated by 4.52 mm. A potential difference of 600 V exists between the plates. (a) What is the magnitude of the electric field between the plates?
Two kilomoles of a monatomic ideal gas are at a temp of 300K. The gas expands reversibly and isothermally twice its original volume. Calculate the work done by the gas. (Note that for an ideal gas U is proportional to T, so the change of U = 0 in ..
What is the magnitude of the induced electric field 0.2070cm from the axis of the solenoid? Give your reply in Volts/meter in scientific notation to three significant digits.
A 60-kg basketball is dropped out of a window that is 6.1m above the ground. The ball is caught by a person whose h&s are 1.5m above the ground. Find gravitational potential energy of the ball.
What is modify in frequency ff - fi
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