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Two concentric metal spheres are found to have a potential difference of 646.0 V when a charge of 2.816·10-8 C is applied to them. The radius of the outer sphere is 0.188 m. What is the radius of the inner sphere?
Suppose a collision produces a pair of particles, an electron and a positron (antielectron). the two are both initially traveling at a velocity of 8.0E4i m/s. what is the electric force on the electron? (neglect the electric force due to the positr..
A chair of weight 85.0N lies atop a horizontal floor; the floor is not frictionless. Using Newton's laws, calculate n, the magnitude of the normal force that the floor exerts on the chair
A child and sled with a combined mass of 55.20 kg slide down a frictionless hill that is 7.84 m high at an angle of 26o from horizontal. The acceleration of gravity is 9.80 m/s2. If the sled starts from rest, what is its speed at the bottom of hil..
A tennis ball is hit straight up at 25 m/s from the edge of a sheer cliff. Some time later, the ball passes the original height from which it was hit, What total distance did the ball travel
The distance between the lenses in a compound microscope is 18 cm. The focal length of the objective is 1.5 cm. what must be the focal length of the eyepiece
A plane move through the air. This results in the air under thewing moving at speed v=50 m/s. what is the lift exerted on the plane in Newtons
According to a reliable report, in 1795 a member of the Turkish embassy in England shot an arrowto a distance of 441m. calcualte what must have been the minimum initial speed of the arrow
A physics teacher tells her class that their final project requires the students to measure a specific variable and determine the velocity of a car with no more than 2.5% error. Will Jennifer and Johnny pass their final project
A thin layer of oil (n=1.25) is floating on water (n=1.33). What is the minimum non zero thickness of the oil in the region
Suppose a patient having an MRI is immersed in a 3.0 T field along the axis of his body. He then quickly tips his head to the side, toward his right shoulder, tipping his head by 30 degrees in the rather short time of 0.15 s.
A hare and a tortoise compete in a race over a straight course 0.90 km long. The tortoise crawls at a speed of 0.300 m/s toward the finish line, For how long in time was the hare stationary
An electron orbiting a hydrogen atom has an initial energy of -0.544 eV. The atom emits a photon, then absorbs a photon, ending up with an energy of -3.4 eV. What was the wavelength of the emitted photon?
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