Physics, 30.01.2020 04:46 kkelley3141
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 6.4 m/s. (a) in a stiff-legged landing he comes to a halt in 2.0 ms. find the average net force that acts on him during this time. (b) when he bends his knees, he comes to a halt in 0.10 s. find 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 force of the ground on the man in parts (a) and (b).
Answers: 1
Physics, 21.06.2019 23:30
Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.
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Physics, 22.06.2019 05:10
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Physics, 22.06.2019 13:20
Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron
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When jumping straight down, you can be seriously injured if you land stiff-legged. one way to avoid...
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