COLLEGE PHYSICS, VOL. 1-W/ACCESS
4th Edition
ISBN: 9780134899978
Author: Knight
Publisher: PEARSON
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Chapter 1, Problem 76MSPP
The images of trees in Figure P1.68 come from a catalog advertising fast-growing trees. If we mark the position of the top of the tree in the successive years, as shown in the graph in the figure, we obtain a motion diagram much like ones we have seen for other kinds of motion. The motion isn't steady, of course. In some months the tree grows rapidly; in other months, quite slowly. We can see, though, that the average speed of growth is fairly constant for the first few years.
Figure P1.68
68. What is the tree's speed of growth, in feet per year, from t = 1 yr to t = 3 yr?
- A. 12 ft/yr
- B. 9 ft/yr
- C. 6 ft/yr
- D. 3 ft/yr
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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!
Chapter 1 Solutions
COLLEGE PHYSICS, VOL. 1-W/ACCESS
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