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Two small spheres spaced 20.0 centimeters apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57 x 10^-21 newtons?
A massless, rigid board is placed across two bathroom scales that are separated by a distance of 2.06 m. Locate the center of gravity of the person relative to the scale beneath his head
If the bar has mass of 200g, a length of 15 cm, and th magnetic field has a magnitude of 0.2T, what must be the minimum current(direction and magnitude) to lift the bar
A ferrari race car on the straight road starts from rest, accelerating at 2.00 m/s^2 until it reaches a speed of 20.0m/s. Then the car travels for 20.0 s at the constant speed until the brakes are applied, stopping the truck in a uniform manner in an..
Consider a balloon filled with helium gas at room temperature (T = 289 K) and atmospheric pressure. Calculate the average de Broglie wavelength of the helium atoms
A 1200kg car rounds a curve of radius 65 m banked at an angle of 14degrees. if the car is traveling at 30km/hr, will a friction force be required? if so, how much and in what direction.
q1. points a and b have electric potentials of 320 and 160 respectively. when an electron released from rest at point a
Two small metal spheres with masses 2.0 {rm g} and 4.0 {rm g} are tied together by a 5.3-{rm cm}-long massless string and are at rest on a frictionless surface. Each is charged to +2.3 mu C. What is the energy.
Two groups of canoeists meet in the middle of a lake. After a brief visit, a person in canoe 1 pushes on canoe 2 to separate the canoes. Suppose the speeds of the two canoes after they are pushed apart are 0.40 m/s for canoe 1 and 0.28 m/s for canoe ..
A magnifying glass uses a converging lens with a focal length of 14.5 cm. It produces a virtual, How far is the object from the lens
a force of 60 N causes an object to have an acceleration equal to 4 m/s2. What is the object's mass
A ball is thrown in the air at an initial angle 35 degrees above the horizontal. It takes 4 seconds for the ball to hit the ground
Suppose the space shuttle is in orbit 460km from the Earth's surface, and circles the Earth about once every 93.80 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g, gravitational accelera..
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