Afarsighted boy has a near point at 2.3 m and requires eyeglasses to correct his vision. corrective lenses are available in increments in power of 0.25 diopters. the eyeglasses should have lenses of the lowest power for which the near point is no further than 25 cm. the correct choice of lens power for eyeglasses, in diopters, is:

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Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

How to tell if two objects are in thermal equilibrium 1.the objects have the same temperature 2.the objects are the same size 3.the objects are touching each other 4.the objects temperatures are changing