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Question
A person bending forward to lift a load "with his back" rather than "with his knees" can be injured by large forces exerted on the muscles and vertebrae. Spine pivots mainly at the fifth lumbar vertebra, with the principal supporting force provided by the erector spinalis muscle in the back. To see a magnitude of the forces involved, and to understand why back problems are common among humans, consider the model of a person bending forward to lift a Wo = 235 N object. The spine and upper body are represented as a uniform horizontal rod of weight Wb = 295 N, pivoted at the base of the spine. The erector spinalis muscle, attached at a point two-thirds of the way up the spine, maintains the position of the back. The angle between the spine and this muscle is 12.0o. Find a tension in the back muscle and the compressional force in the spine.
The function y(x, t) = (25.0 cm) cos(?x - 26?t), with x in meters and t in seconds, describes a wave on a taut string. What is the transverse speed for a point on the string at an instant
On a clear day the electric ?eld in the atmosphere near the earth's surface is 100 N/C, What is the potential at the top of a man's head if the man is 2 m tall and is standing
Assume that each cubic centimeter of water has a mass of exactly 1.00 g. What is the mass of one cubic meter of water
A proton and an electron are held apart a distance of one meter, Calculate the electric force F between them and Show the electric force vector on each of them
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An astronaut stands by the rim of a crater on the moon, where the acceleration of gravity is 1.62 m/s2. what is the depth of the crater
You want to throw a pebble at a window located 9.6 m above the ground, making sure that the pebble hits the lowest part of the window with a strictly horizontal velocity. What is the velocity with which the pebble hits the window
Two strings are adjusted to vibrate at exactly 188 Hz. Then the tension in one string is increased slightly. What is the new frequency of the string
what is the final Velocity of a hoop that rolls without slipping down a high hill, starting from rest
In a bicycle race, the leader is travelling with a constant velocity of 11.10 m/s and is 10.0 m ahead of the second-place cyclist. The second place cyclist has a velocity of 9.50 m/s and an acceleration of 1.20 m/s squared. How much time elapses b..
What was the velocity of the bullet just before it struck the wooden block? The length of the string is 2 meters.
A 1200g model rocket is resting horizontally at the top edge of a 40-m-high wall when it is accidentally bumped, How far from the base of the wall does the rocket land
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