8.-When jumping straight down, you can be seriously injured if youland stiff-legged. One way to avoid injury is to bend your kneesupon landing to reduce the force of the impact. A 75-kg man just beforecontact with the ground has a speed of 6.4 m/s. (a) In a stiff-legged land-ing he comes to a halt in 2.0 ms. Find the average net force that acts onhim during this time. (b) When he bends his knees, he comes to a halt in0.10 s. Find the average net force now. (c) During the landing, the forceof the ground on the man points upward, while the force due to gravitypoints downward. The average net force acting on the man includes bothof these forces. Taking into account the directions of the forces, find theforce of the ground on the man in parts (a) and (h).

a) The expression for find average net force is F=-mvt Substitute values in the above equation…

Answered: 8. -When jumping straight down, you can…

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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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 69.5-kg man just before contact with the ground has a speed of 8.82 m/s. (a) In a stiff-legged landing he comes to a halt in 4.17 ms. Find the magnitude of the average net force that acts on him during this time. (b) When he bends his knees, he comes to a halt in 0.267 s. Find the magnitude of the average net force now. (c) During the landing, the force of the ground on the man points upward, while the force due to gravity points downward. The average net force acting on the man includes both of these forces. Taking into account the directions of the forces, find the magnitude of the force applied by the ground on the man in part (b).
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space a kg, including suit and oxygen tank. The tether line securing the astronaut to their spacecraft loses its attachment from the spacecraft while they are on a spacewalk. The astronaut is initially at rest with respect to the spacecraft, they then throw their 12.0 kg oxygen tank away from their spacecraft with a speed of 8.00 m/s in order to propel themselves back towards it. I) Calculate the maximum distance they can possibly be from the spacecraft and still return within 2.00 min (the amount of time the air in their helmet remains breathable). II) Which of Newton's law of motion explain best why this strategy works? (a) First (b) Second (c) Third
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A 3.00-kg steel ball strikes a wall with a speed of 10.0 m/s at an angle of 60.0° with the surface. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.300 s, what is the average force exerted by the wall on the ball in Newtons? 60.0 --X 60.0 Lütfen birini seçin: O A. -173 O B. -120 O C. -240 O D. -260 O E. -150

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