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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?
W hat is the downward acceleration of the blue spool
compare with the force of gravitational attraction between them.Find the position of the particle after this time.
What happens in the table as to the potential energies
For silver electrode (hint: click just below the word "cesium"), what is the highest energy of an electron ejected by light of 250 nm.
A 76 g, 40-{rm cm}-long rod hangs vertically on a frictionless, horizontal axle passing through its center. A 10 g ball of clay travelling horizontally at 2.70 m/s hits and sticks to the very bottom tip of the rod. To what maximum angle, measured fro..
A wire is stretched between two posts. Another wire is stretched between two posts that are four times as far apart. The tension in the wires is the equal, and they have the same mass.
On an airplane's takeoff, the combined action of the air around the engines and wings of an airplane exerts an 8020-N force on the plane, focussed upward at the angle of 55.0° above the horizontal. The plane rises with constant velocity in the vertic..
When the electric power was turned off, the electric motor originally running at 1800 rpm comes to rest in 15.0 s. Find out the angular acceleration, the angular velocity at the end of 5.0 s, and the total angle turned through in 15.0 s.
A worker is pulling a cart. The frictional force between the cart and the ground is 500N. What is the minimum force that must be applied by worker to move the cart.
For the situation, the magnetic field changes with time according to the expression B = (2.00t3 - 4.00t2 + 0.800)T, and r2 = 2R = 5.00 cm. (a) Calculate the magnitude and direction of the force exerted on an electron located at point P2 when t = 2.00..
A beam of light enters the fiber from air at an angle theta1 with respect to the normal. What is theta1 if light strikes the core-cladding interface at critical angle theta c.
A baseball has a mass of 140 grams and a softball has a mass of 280 grams. In which of the situations would they both have the same momentum.By how much will a bar long of the same material.
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