The Physics of Everyday Phenomena
The Physics of Everyday Phenomena
8th Edition
ISBN: 9780073513904
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Chapter 17, Problem 1CQ
To determine

Whether the velocity of light changes on reflection.

Expert Solution & Answer
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Answer to Problem 1CQ

The velocity of light changes on reflection as the direction of motion changes.

Explanation of Solution

The velocity is a vector given by the rate of change of displacement. The speed of light is a constant.

As the light travels the direction of the velocity is towards the mirror. On reflection the speed remains the same as the speed of light is a constant. The direction however changes as the light is reflected. The light on reflection starts to move in the opposite direction which means that the direction of velocity also changes. Therefore, the velocity being a vector also changes.

Conclusion:

Therefore, the velocity of light changes on reflection, as the direction of motion changes.

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The force of the quadriceps (Fq) and force of the patellar tendon (Fp) is identical (i.e., 1000 N each). In the figure below angle in blue is Θ and the in green is half Θ (i.e., Θ/2). A) Calculate the patellar reaction force (i.e., R resultant vector is the sum of the horizontal component of the quadriceps and patellar tendon force) at the following joint angles: you need to provide a diagram showing the vector and its components for each part. a1) Θ = 160 degrees, a2) Θ = 90 degrees. NOTE: USE ONLY TRIGNOMETRIC FUNCTIONS (SIN/TAN/COS, NO LAW OF COSINES, NO COMPLICATED ALGEBRAIC EQUATIONS OR ANYTHING ELSE, ETC. Question A has 2 parts!
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