(III) (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). mg F. grd FIGURE 7-34 Problem 24.

(III) (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). mg F. grd FIGURE 7-34 Problem 24.

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)...

See similar textbooks

Similar questions

(II) Two billiard balls of equal mass undergo a pertectly elastic head-on collision. If one ball's initial speed was 2.00 m/s, and the other's was 3.60 m/s in the opposite direction, what will be their speeds and directions after the collision?
What is the impulse experience by a 2-kg object if the force acting on it is given in the following? F(N) 100 50 2 4 t(s)
(a) Compute the impulse necessary to bring to rest the 48.0 kg driver of an automobile initially moving at 20m / s? b) Find the average force on the driver if the deceleration is accomplished gradually by the application of brakes over a 11.6 s inteval? (c) Find the average force if the car is stopped in a collision that brings the driver's seat to rest in 0.100 s assuming the driver is restrained by a seat belt?
(d) In terms of the impulse-momentum theorem, describe the underlying physics in the benefit of built in automotive crumple zones in medium speed collisions. (e) What is the difference between an elastic and an inelastic collision?
Which of the following explains why when we land on our feet, we naturally bend our knees? : think about the relationship between force, impulse, and time.
Calculate the magnitude of the impulse experienced when a 62-kg person with an initial speed of 7 m/s lands to rest on firm ground after jumping from a height of 3.0 m.
Calculate the magnitude of the impulse experienced when a 52-kg person with an initial speed of 7 m/s lands to rest on firm ground after jumping from a height of 3.0 m.
(c) A volleyball player drops the ball of mass 425 g with the velocity of 32 m/s from a height of 10 m from the ground floor. After colliding with the floor it moves with the velocity of 36 m/s, making angle of 30 degree with the horizontal floor. Calculate the magnitude and direction of impulse act during the collision.
"Calculate the magnitude of the impulse experienced when a 58-kg person with an initial speed of 5 m/s lands to rest on firm ground after jumping from a height of 3.0 m."
Professional Application - A 75.0-kg person is riding in a car moving at 20.0 m/s when the car runs into a bridge abutment. (a) Calculate the average force on the person if he is stopped by a padded dashboard that compresses an average of 1.00 cm. (b) Calculate the average force on the person if he is stopped by an air bag that compresses an average of 15.0 cm.