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. [Hìnt: 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 grd FIGURE 7-34 Problem 24. E Floctio Callicin 25. (ID A ball of mass 0 440 . "pocu of 3.ðu m/s collides head u With a 0.220-kg ie speeu dilu unv Vv vun al[er the coIlisIon: 26. (II) A 0.450-kg hockey puck, moving east with a speed of 5.80 m/s, has a head-on collision with a 0.900-kg puck ini- tially at rest. Assuming a perfectly elastic collision, what will be the speed and direction of each puck after the collision?

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. [Hìnt: 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 grd FIGURE 7-34 Problem 24. E Floctio Callicin 25. (ID A ball of mass 0 440 . "pocu of 3.ðu m/s collides head u With a 0.220-kg ie speeu dilu unv Vv vun al[er the coIlisIon: 26. (II) A 0.450-kg hockey puck, moving east with a speed of 5.80 m/s, has a head-on collision with a 0.900-kg puck ini- tially at rest. Assuming a perfectly elastic collision, what will be the speed and direction of each puck after the collision?

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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4) Two boxes are on a frictionless work surface that is 5m off the ground. The second mass on the right is double the mass of the box on the left. The box on the left has an initial speed of 10 m/s and has an elastic collision with the second box. How far does the second box travel to the right of the work surface (the horizontal distance from the right edge) before hitting the ground?
We found that when two objects interact and gain equal (and opposite) momenta, the lighter one gains more KE. Can you explain why this happens so it makes sense?
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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.
a) Compute the impulse necessary to bring to rest the 50.0 kg driver of an automobile initially moving at 25.0 m/s. (b) Find the average force on the driver if the deceleration is accomplished gradually by the application of brakes over a 10.0 s interval. (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. What are the functions of seat belts and airbags in a collision?
11) A hard, dense ball has a mass of 6.19 kg and is released from rest a distance of H = 177 cm above a hot, fresh-baked loaf of banana bread that has a mass of 2.65 kg. The ball swings downward on a massless string and makes a perfectly inelastic collision with the banana bread when the string breaks at the bottom of its swing. The ball enters the banana bread loaf and becomes part of it as it slides horizontally off the edge of the table. The table is h = 66.4 cm above the ground. How far from the edge of the table (R) will this ball-plugged banana bread loaf land? Ignore air resistance and friction. a) 1.52 m b) 3.03 m c) 0.08 m d) 0.56 m e) 0.76 m
3)9
"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.