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3. (a) When jumping straight down, you can be seriously injured if you land stiff legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 61.9 kg man just before contact with the ground has a speed of 4.8 m/s. (i) In a stiff-legged landing he comes to a halt in 3.52 ms (milliseconds). Calculate the magnitude of the average net force that acts on him during this time. When he bends his knees, he comes to a halt in 0.109 s. Find the magnitude of the the average net force for this case. (b) An archer fires a 28 g arrow toward a 132 g apple sitting on a stump. The arrow hits the apple at 44 m/s, sticks into it, and both objects fly off the stump together. Use conservation of momentum to calculate the final speed of the apple.

3. (a) When jumping straight down, you can be seriously injured if you land stiff legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 61.9 kg man just before contact with the ground has a speed of 4.8 m/s. (i) In a stiff-legged landing he comes to a halt in 3.52 ms (milliseconds). Calculate the magnitude of the average net force that acts on him during this time. When he bends his knees, he comes to a halt in 0.109 s. Find the magnitude of the the average net force for this case. (b) An archer fires a 28 g arrow toward a 132 g apple sitting on a stump. The arrow hits the apple at 44 m/s, sticks into it, and both objects fly off the stump together. Use conservation of momentum to calculate the final speed of the apple.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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3. (a) When jumping straight down, you can be seriously injured if you land stiff legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 61.9 kg man just before contact with the ground has a speed of 4.8 m/s. (i) In a stiff-legged landing he comes to a halt in 3.52 ms (milliseconds). Calculate the magnitude of the average net force that acts on him during this time. When he bends his knees, he comes to a halt in 0.109 s. Find the magnitude of the the average net force for this case. (b) An archer fires a 28 g arrow toward a 132 g apple sitting on a stump. The arrow hits the apple at 44 m/s, sticks into it, and both objects fly off the stump together. Use conservation of momentum to calculate the final speed of the apple.
Transcribed Image Text:3. (a) When jumping straight down, you can be seriously injured if you land stiff legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 61.9 kg man just before contact with the ground has a speed of 4.8 m/s. (i) In a stiff-legged landing he comes to a halt in 3.52 ms (milliseconds). Calculate the magnitude of the average net force that acts on him during this time. When he bends his knees, he comes to a halt in 0.109 s. Find the magnitude of the the average net force for this case. (b) An archer fires a 28 g arrow toward a 132 g apple sitting on a stump. The arrow hits the apple at 44 m/s, sticks into it, and both objects fly off the stump together. Use conservation of momentum to calculate the final speed of the apple.
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