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Question: 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 0.10s. 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) & (B).
A car travelling at 37 {rm m/s} runs out of gas while travelling up a 7.0{rm ^ {circ}} slope. How far would it coast before starting to roll back down.
A heavy rope used for as a mooring line for a cruise ship sags a shown. If the mass of the rope is 96 kg, what are the tensions in rope at A and B.
A spaceship moves past you at speed v. You calculate the ship to be 364 m long, whereas an astronaut on the ship measures a length of 420 m. Find v.
A jeweler working with a heated 43 gram gold ring must lower the ring's temperature t make it safe to handle. If the ring is initially at 94 degrees Celsius, what mass of water at 22 degrees Celsius is necessary to lower the ring's temperature to 38 ..
A fun-loving 11.4 {rm kg} otter slides up a hill and then back down to the same place. If she starts up at 5.75 {rm m/s} and returns at 3.75 {rm m/s}, how much mechanical energy did she lose on the hill.
A uniform plank of length 5.40 m and weight 217 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 417 N walk on the overhanging part of the plank before it immedia..
Problem on elevator
How numerous years would it take a thermally insulated one-million-kilogram chuck of granite to undergo a 1000k boost in temperature?
An ice block is pushed horizontally on a frictionless surface with initial velocity v0. At some point, it comes to the nearly semicircular bump with a radius R=0.42m and the height h=0.33m above the ground.
A 260 wooden raft floats on a lake. When an 80 man stands on the raft, it sinks 5.0 deeper into the water. When he steps off, the raft vibrates for a while. What is the frequency of vibration.
What is the horizontal component of the ball velocity
Recognize and sketch all the external forces acting on the chair. Because the chair can be represented as a point particle of mass, draw the forces with their tails centered on the black dot in the middle of chair. Be certain to draw the forces so th..
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