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A person's prescription for bifocals is -0.25 diopter for distant vision and +2.50 diopters for near vision, the near vision being accomplished by inserts into the distant vision lens. Obtain the net power of the near vision correction?
It is difficult to understand where a majority of the numbers are derived from in step 3. First where was the 288R derived from? Secondly where was the 615.38 R derived from?
A ray of light strikes a flat block of glass (n = 1.53) of thickness 1.80 cm at an angle of 36.0° with the normal. find the angles of incidence and refraction at each surface
Bill can throw a ball vertically at a speed 1.2 times faster than Joe can. How many times higher will Bill's ball go than Joe's
A boat observed by an observer on the shore moves at right angle to the motion of a stream at 4m/s. what is the speed of the boat with respect to the water
A 160 kg horizontal beam is supported at each end. A 300 kg piano rests a quarter of the way from one end. What is the vertical force on each of the supports
During a car crash a 65kg person's head goes from traveling at 50kmh-1 to stationary in 0.15 s. What is the magnitude of the average net force acting on the head of a person with a 4.5kg head
Two capacitors of capacitance 6.00 microFarad and 8 microfarad are connected in parallel, What is the potential difference across the 6.00-uF capacitor
Water is pumped steadily out of a flooded basement at a speed of 5.1 m/s through a uniform hose of radius 0.5 cm. What is the power of the pump
Two cylindrical bars, each with diameter of 2.30 cm, are welded together end to end. One of the original bars is copper and is 0.350 m long
Presume a rocket-propelled motorcycle is fired from rest horizontally across a canyon 1.10 km wide. What minimum constant acceleration in the x-direction should be provided by the engines so the cycle crosses safely if the opposite side is 0.760 km l..
In the figure below a crowbar is used to lift a weight. If a down ward force of 228 N is applied to the end of the bar, how much weight does the other end bear? The crowbar itself has negligible weight. (Let r1 = 29.0 cm and r2 = 4.70 cm.)
Suppose two alpha particles were held together so they were just touching. Estimate the electrostatic repulsive force each would exert on the other
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