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A person sees clearly wearing eyeglasses that have a power of -5.00 diopters when the lenses are 1.65 cm in front of the eyes.
(a) What is the focal length of the lens?
(b) Is the person nearsighted or farsighted?
(c) If the person wants to switch to contact lenses placed directly on the eyes, what lens power should be prescribed?
The electron beam inside a television picture tube is 0.300mm in diameter and carries a current of 55.0 uA. What is the current density in the electron beam
A pronghorn antelope has been observed to cover 1.60 km with an average speed of 67.0 km/h. The antelopes speed during the first half of the distance is 88.0km/h. find the antelopes speed during the second half of its run
A cube of ice is taken from the freezer at -8oC and placed in a 110 g aluminum calorimeter filled with 300 g of water at a temperature of 22oC. What was the mass of the ice cube
A certain concrete will support a maximum compressive stress of 1.12 107 N/m2 before being crushed. A column of uniform width is to be made with this concrete. How tall can the column be if the stress in it at any point is not to exceed one fifth the..
An electric vehicle starts from rest and accelerates at a rate of 2.4 m/s2 in a straight line until it reaches a speed of 14 m/s. How much time elapses from start to stop
A stationary bicycle is raised off the ground, and its front wheel (m = 1.38 kg) is rotating at an angular velocity of 14.3 rad/s, What is the magnitude of the normal force that each brake pad applies to the rim
Avoiding air resistance, what is the magnitude of the total velocity of the package at the moment it is thrown as seen by an observer on the ground? Answer in units of m/s.
A landing craft approaches the surface of Penitgy, a planet in a far-away galaxy. The landing craft has two engines attached to the bottom, what is the mass of the landing craft
neglect air resistance during the descent. she comes to rest 3 m under the surface of the water. Find out the average force that the water exerts on the diver
a plane flying horizontally in a straight line over the ocean drops a monitoring buoy for a science experiment. explain
The ems of an AC circuit has an rms value of 120V. What is the maximum positive emf
A hunter is standing on flat ground between two vertical cliffs that are directly opposite one another. find the distance between the cliffs
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