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Two 6.00-kg spheres carry identical charges and are placed a distance d from each other
How large should the charge on each sphere be so that the repulsive electric force between them balances the attractive gravitational force between them?
What is the smallest mass that can balance in this way, given that the smallest possible charge is e=1.602Af-10Acˆ'19C?
A spherical shell of copper with an outer diameter of 19.0 cm floats on fresh water with one third its volume above the water's surface
The train's weight is 17 Tons and the desired speed is500km/hr. The test rail track is 20Km long. how much current is necessary to create that magnetic field
A police car is moving at 38m/sec to catchup with a speeder directly ahead. The speed limit is 29.1 m/sec. How fast is speeder going
A cubical box 20cm on a side is constructed from 1.5cm -thick concrete panels. What is the air temperature inside the box when the light is on if the surrounding air temperature is 20 ?C
A 0.271 kg bead slides on a curved wire, starting from rest at point A as shown in the figure. The acceleration of gravity is 9.8 m/s2 . If the wire is frictionless, find the speed of the bead at B. Find the speed of the bead at C. A5.58 m B C1.09 m
A toroid having a square cross section, 6.00 cm on a side, and an inner radius of 18.0 cm has 350 turns and carries a current of 0.650 A. What is the magnitude of the magnetic field inside the toroid
A hunter aims directly at a target (on the same level) 137 m away. If the bullet leaves the gun at a speed of 271 m/s, by how much will it miss the target? At what angle must the gun be aimed so the target will be hit?
The water is near freezing in temperature. Typically a human can only swim in such water for about 5 minutes before hypothermia sets in. Calculate the time the explorer spends in the water if the river is 91.9 feet wide
A thin film of oil (n = 1.24) is located on a smooth, wet pavement. When viewed perpendicular to the pavement, How thick is the oil film
Write a paragraph explaining how Newton's Third Law of Motion is illustrated when a real NASA rocket is launched at Cape Canaveral.
The amount of heat that an engine discards to the cold reservoir is 2 times the amount of work that it does. Evaluate what is the efficiency of the engine
A motor has an armature resistance of 3.25Ω . If it draws8.20 A when running at full speed and connected to a 120-V line, how large is the back emf
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