Concept explainers
(Modeling) Speed of Light When a light ray travels from one medium, such as air, to another medium, such as water or glass, the speed of the light changes, and the light ray is bent, or refracted, at the boundary between the two media. (This is why objects under water appear to be in a different position from where they really are.) It can be shown in physics that these changes are related by Snell's law
where c1 is the speed of light in the first medium, c2 is the speed of light in the second medium, and θ1 and θ 2 are the
Find the speed of light in the second medium for each of the following.
(a)
(b)
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- Physics Experiment Consider a physics laboratory experiment designed to determine an unknown mass. A flexible metal meter stick is clamped to a table with 50 centimeters overhanging the edge (see figure). Known masses Mranging from 200grams to 2000grams are attached to the end of the meter stick. For each mass, the meter stick is displaced vertically and then allowed to oscillate. The average time t(in seconds) of one oscillation for each mass is recorded in the table. A model for the data that can be used to predict the time of one oscillation is t=38M+16,96510(M+5000). (a) Use this model to create a table showing the predicted time for each of the masses shown in the table above. (b) Compare the predicted times with the experimental times. What can you conclude? (c) Use the model to approximate the mass of an object for which t=1.056seconds.arrow_forwardPopulation The population P (in millions) of Italy from 2003 through 2015 can be approximated by the model P=57.59e0.0051t, where t represents the year, with t=3 corresponding to 2003. (a) According to the model, is the population of Italy increasing or decreasing? Explain. (b) Find the populations of Italy in 2003 and 2015. (c) Use the model to predict the populations of Italy in 2020 and 2025.arrow_forward
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