Suppose that a person bends his knees less while landing, would the force exerted on him...
Homework Answers
Force exerted on him will be lesser in case he bends his legs as when he bends his legs he lengthen the time for which he decelerates and as force exerted on him will be rate of change of momentum, F = dp/dt. as dt increases F will decrease hence he will be less injured.
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Suppose that a person bends his knees less while landing, would the
force exerted on him...
Question 2. A 60 kg person bends his knees and then jumps straight up. his feet...
Question 2. A 60 kg person bends his knees and then jumps straight up. his feet leave the floor, his motion is unaffected by air resistance and his cent of mass rises by a maximum of 15.0 cm. Model the floor as completely solid motionless. (18 points) a. Does the floor impart impulse to the person? b. Does the floor do work on the person? C. With what momentum does the person leave the floor? d. Does it make sense...
Question 2. A 60 kg person bends his knees and then jumps straight up. A of...
Question 2. A 60 kg person bends his knees and then jumps straight up. A of mass rises by a maximumotion is unaffected by air resistance and his center soy a maximum of 15.0 cm. Model the floor as completely solid and motionless. (18 points) a. Does the floor impart impulse to the person? b. Does the floor do work on the person? C. With what momentum does the person leave the floor? d. Does it make sense to say...
a person jumps from the roof of a house 2.8 m high when he strikes the...
a person jumps from the roof of a house 2.8 m high when he strikes the ground below, he bends his knees so that his torso decelerates over an approximate distance of 0.70 m if the mass of his torso ( excluding legs ) is 42 kg. find his velocity before his feet strike the ground the average force exerted
A person is walking in a shallow, clear bay, in still water just over her knees....
A person is walking in a shallow, clear bay, in still water just over her knees. When she looks down at her feet in the sand, he notes that they appear closer to him than usual. While standing in air, his feet are 1.60 m below his eyes. How far away do his feet appear when they are under 0.60m of water? Do they look smaller, larger, or the same size? Please determine the magnification factor.
When you leap down from a high perch, you have a gentler landing with less force...
When you leap down from a high perch, you have a gentler landing with less force if you bend your knees as you land. Use the principles of impulse and momentum to explain why this approach reduces the force on you.
When jumping straight down, you can be seriously injured if you land stiff-legged. One way to...
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 75-kg man just before contact with the ground has a speed of 5.5 m/s. (a) In a stiff-legged landing he comes to a halt in 2.4 ms. Find the average net force that acts on him during this time. _________N (b) When he bends his knees, he...
When jumping straight down, you can be seriously injured if you land stiff-legged. One way to...
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 89.8-kg man just before contact with the ground has a speed of 8.70 m/s. (a) In a stiff-legged landing he comes to a halt in 3.21 ms. Find the magnitude of the average net force that acts on him during this time. (b) When he bends his...
Why is it that a person can lay still on a "bed" of nails (see the...
Why is it that a person can lay still on a "bed" of nails (see
the figure below) without suffering any serious injuries but would
incur severe puncture wounds to his feet if he tried to stand
barefoot on the same "bed"?
Why is it that a person can lay still on a bed of nails (see the figure below) without suffering any serious injuries but would incur severe puncture wounds to his feet if he tried to stand barefoot...
In-depth analyses A. We are going to think a lot about the knees of a 70-kg...
In-depth analyses A. We are going to think a lot about the knees of a 70-kg athlete. 1. First, Estimate the amount of upward force that each knee must produce when this athlete is standing in place. Explain your reasoning 2. Estimate the amount of upward force that a knee must produce when this athlete supports his entire weight on one leg. Describe the types of situations when an athlete might be doing this 3. There are many situations in...
A boxer receives a horizontal blow to the head that topples him over. The force, of...
A boxer receives a horizontal blow to the head that topples him over. The force, of magnitude 1.40 103 N, is applied for 1.3 10-2 s at a point 1.71 m above the floor. The boxer has a moment of inertia of 73.8 kg ยท m2 for rotation about an axis at his feet. (a) Find the boxer's final angular velocity. (b) How long would it take him to hit the floor if he continued with the same angular velocity?...
Question 2. A 60 kg person bends his knees and then jumps straight up. his feet leave the floor, his motion is unaffected by air resistance and his cent of mass rises by a maximum of 15.0 cm. Model the floor as completely solid motionless. (18 points) a. Does the floor impart impulse to the person? b. Does the floor do work on the person? C. With what momentum does the person leave the floor? d. Does it make sense...
Question 2. A 60 kg person bends his knees and then jumps straight up. A of mass rises by a maximumotion is unaffected by air resistance and his center soy a maximum of 15.0 cm. Model the floor as completely solid and motionless. (18 points) a. Does the floor impart impulse to the person? b. Does the floor do work on the person? C. With what momentum does the person leave the floor? d. Does it make sense to say...
Why is it that a person can lay still on a "bed" of nails (see
the figure below) without suffering any serious injuries but would
incur severe puncture wounds to his feet if he tried to stand
barefoot on the same "bed"?
Why is it that a person can lay still on a bed of nails (see the figure below) without suffering any serious injuries but would incur severe puncture wounds to his feet if he tried to stand barefoot...
In-depth analyses A. We are going to think a lot about the knees of a 70-kg athlete. 1. First, Estimate the amount of upward force that each knee must produce when this athlete is standing in place. Explain your reasoning 2. Estimate the amount of upward force that a knee must produce when this athlete supports his entire weight on one leg. Describe the types of situations when an athlete might be doing this 3. There are many situations in...
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