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A nearsighted person cannot see objects clearly beyond 25 cm (her far point). If she has no astigmatism and contact lenses are prescribed for her, what a) power and b) type of lens are required to correct her vision?
A molecule of DNA (deoxyribonucleic acid) is 2.28 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. Determine the effective spring constant of the molecule
Blocks A, B, and C are placed as in the diagram below and connected by ropes of negligible mass. What is the weight of block
a 15.0 tank contains 0.209 of helium at 23.0. the molar mass of helium is 4.00 .how many moles of helium are in the
Two identical diverging lenses are separated by 18 cm. The focal length of each lens is -8.0 cm. Determine the final image distance relative to the lens
A 7.0 k resistor is in series with a 26.0-mH inductor, Calculate the impedance of the circuit for the following source frequencies
A billiard ball of mass m = 0.25 kg strikes the cushion of a billiard table at ?1 = 58° and a speed v1 = 30 m/s. What is the magnitude of its change in momentum
A 2500- Ferris wheel accelerates from rest to an angular speed of 0.21rad/sec in 14sec . Approximate the Ferris wheel as a circular disk with a radius of 30m. What is the net torque on tyhe wheel?
You are standing between two plane mirrors that are parallel to each other. Determine the first two mirror positions on each side of you relative to the mirrors
In a Mass Spectrometer, ions of a precisely selected speed are sent into a uniform magnetic field where they move along a semicircle, What is the mass of the ion
a 13 nc charge is located at the origin.what is the strength of the electric field at the position xy 5 cm 0 cm?what
A 19-kg chandelier is suspended from the ceiling by four vertical steel wires. Each wire has an unloaded length of 5 m, how far do the wires stretch
Fusion reactors attempt to utilize the same nuclear reaction that occurs within the sun. Two deuterium nuclei will combine together to form helium if they are close enough, How fast must the deuterium nuclei be going to touch
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