Physics: Principles with Applications
7th Edition
ISBN: 9780321625922
Author: Douglas C. Giancoli
Publisher: Addison-Wesley
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Chapter 7, Problem 24P
(a) Calculate the impulse experienced when a 55-kg person lands on firm ground after jumping from a height of 2.8 m. (b) Estimate the average force exerted on the person's feet by the ground if the landing is stiff-legged, and again (c) with bent legs With stiff legs, assume the body moves 1.0 cm during impact, and when the legs are bent, about 50 cm. [Hint: The average net force on him, which is related to impulse, is the vector sum of gravity and the force exerted by the ground See Fig. 7-34] We will see in Chapter 9 that the force in (b) exceeds the ultimate strength of bone (Table 9-2).
Figure 7-34
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Chapter 7 Solutions
Physics: Principles with Applications
Ch. 7 - A railroad car loaded with rocks coasts on a level...Ch. 7 - 2. Which answer would you choose if the rocks fall...Ch. 7 - Prob. 1QCh. 7 - Prob. 2QCh. 7 - 3. When a person jumps from a tree to the ground,...Ch. 7 - Prob. 4QCh. 7 - Prob. 5QCh. 7 - Prob. 6QCh. 7 - According to Eq. 7-4, the longer the impact time...Ch. 7 - If a falling ball were to make a perfectly elastic...
Ch. 7 - A boy stands on the back of a rowboat and dives...Ch. 7 - It is said that in ancient times a rich man with a...Ch. 7 - The speed of a tennis ball on the return of a...Ch. 7 - Is it possible for an object to receive a larger...Ch. 7 - In a collision between two cars, which would you...Ch. 7 - A very elastic “superball” is dropped from a...Ch. 7 - Prob. 15QCh. 7 - Prob. 16QCh. 7 - Prob. 17QCh. 7 - Prob. 18QCh. 7 - Prob. 19QCh. 7 - Prob. 20QCh. 7 - Prob. 21QCh. 7 - Prob. 22QCh. 7 - Prob. 23QCh. 7 - Bob and Jim decide to play tug-of-war on a...Ch. 7 - 25. In one type of nuclear radioactive decay, an...Ch. 7 - Prob. 26QCh. 7 - Prob. 27QCh. 7 - Prob. 28QCh. 7 - Prob. 1MCQCh. 7 - Prob. 2MCQCh. 7 - Prob. 3MCQCh. 7 - Prob. 4MCQCh. 7 - Prob. 5MCQCh. 7 - Prob. 6MCQCh. 7 - Prob. 7MCQCh. 7 - Prob. 8MCQCh. 7 - Prob. 9MCQCh. 7 - 10. Choose the best answer in the previous...Ch. 7 - 11. A railroad tank car contains milk and rolls at...Ch. 7 - Prob. 12MCQCh. 7 - 1. (I) What is the magnitude of the momentum of a...Ch. 7 - A constant friction force of 25 N acts on a 65-kg...Ch. 7 - Prob. 3PCh. 7 - Prob. 4PCh. 7 - Calculate the force exerted on a rocket when the...Ch. 7 - A 7700-kg boxcar traveling 14 m/s strikes a second...Ch. 7 - A child in a boat throws a 5.30-kg package out...Ch. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - An object at rest is suddenly broken apart into...Ch. 7 - A22- bullet traveling 240 m/s penetrates a 2.0-kg...Ch. 7 - Prob. 12PCh. 7 - Prob. 13PCh. 7 - Prob. 14PCh. 7 - Prob. 15PCh. 7 - A golf ball of mass 0.045 kg is hit off the lee at...Ch. 7 - Prob. 17PCh. 7 - Prob. 18PCh. 7 - Prob. 19PCh. 7 - Prob. 20PCh. 7 - Prob. 21PCh. 7 - With what impulse does a 0.50-kg newspaper have to...Ch. 7 - Prob. 23PCh. 7 - (a) Calculate the impulse experienced when a 55-kg...Ch. 7 - A ball of mass 0.440 kg moving east (+ x...Ch. 7 - 26. (II) A 0.450-kg hockey puck, moving east with...Ch. 7 - Prob. 27PCh. 7 - Two billiard balls of equal mass undergo a...Ch. 7 - 29. (II) A 0.280-kg croquet ball makes an elastic...Ch. 7 - Prob. 30PCh. 7 - Prob. 31PCh. 7 - Prob. 32PCh. 7 - Prob. 33PCh. 7 - Prob. 34PCh. 7 - Prob. 35PCh. 7 - Prob. 36PCh. 7 - Prob. 37PCh. 7 - Prob. 38PCh. 7 - Car A hits car B (initially at rest and of equal...Ch. 7 - Prob. 40PCh. 7 - Prob. 41PCh. 7 - Prob. 42PCh. 7 - Prob. 43PCh. 7 - Prob. 44PCh. 7 - Prob. 45PCh. 7 - Prob. 46PCh. 7 - An atomic nucleus of mass m traveling with speed v...Ch. 7 - Prob. 48PCh. 7 - Prob. 49PCh. 7 - Find the center of mass of the three-mass system...Ch. 7 - Prob. 51PCh. 7 - Prob. 52PCh. 7 - Prob. 53PCh. 7 - Prob. 54PCh. 7 - Prob. 55PCh. 7 - Prob. 56PCh. 7 - Prob. 57PCh. 7 - Prob. 58PCh. 7 - Prob. 59PCh. 7 - Prob. 60PCh. 7 - Prob. 61PCh. 7 - Prob. 62PCh. 7 - Prob. 63PCh. 7 - Prob. 64PCh. 7 - Prob. 65PCh. 7 - Prob. 66PCh. 7 - Prob. 67GPCh. 7 - Prob. 68GPCh. 7 - Prob. 69GPCh. 7 - Prob. 70GPCh. 7 - Prob. 71GPCh. 7 - Prob. 72GPCh. 7 - Prob. 73GPCh. 7 - Prob. 74GPCh. 7 - Prob. 75GPCh. 7 - Prob. 76GPCh. 7 - Prob. 77GPCh. 7 - Prob. 78GPCh. 7 - Prob. 79GPCh. 7 - Prob. 80GPCh. 7 - Astronomers estimate that a 2.0-km-diameter...Ch. 7 - Prob. 82GPCh. 7 - Prob. 83GPCh. 7 - Prob. 84GPCh. 7 - Prob. 85GPCh. 7 - 86. A novice pool player is faced with the corner...
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