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A window in a house is rectangular, with height 49 cm and width 29 cm. The pressure inside the house is normal atmospheric pressure when a hurricane arrives and the wind speed outside is 79 m/s (about 174 mi/h). (Assume the air temperature is 20°C.)
What is the force on the window?
N
A contact lens is made of plastic with an index of refraction of 1.36. The lens has an outer radius of curvature of +1.91 cm and an inner radius of curvature of +2.41 cm. What is the focal length of lens?
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