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Biomedical measurements show that the arms and hands together typically make up 13.0 of a person's mass, while the legs and feet together account for 37.0 . For a rough (but reasonable) calculation, we can model the arms and legs as thin uniform bars pivoting about the shoulder and hip, respectively. Let us consider a 77.0 person having arms 66.0 long and legs 90.0 long. The person is running at 12.0 , with his arms and legs each swinging through in . Assume that the arms and legs are kept straight.
Part A What is the average angular velocity of his arms and legs?
Part B Using the average angular velocity from part A, calculate the amount of rotational kinetic energy in this person's arms and legs as he walks.
Part C What is the total kinetic energy due to both his forward motion and his rotation?
Part D What percentage of his kinetic energy is due to the rotation of his legs and arms?
A stone of mass 0.31 kg is tied to a string of length 0.85 m and is swung in the horizontal circle with speed v. The string has a breaking-point force of 90 N. What is the largest value v can have without string breaking.
A student calculates the frequency of a waveform produced by a tuning fork to be 303 Hz. If the tuning fork is stamped with a frequency of 279 Hz, what is the percent error for the experiment
After they have exchanged charge and are placed 24 cm apart the magnitude of the electric force is now 3.6 Newtons. How much charge, in micro-coulombs, was exchanged
Blood is pumped from the heart at a rate of 5 L/min into the aorta (of radius 1.01 cm). Determine the speed of blood through the aorta
In reaching her destination, a backpacker walks with an average velocity of 1 m/s, due west. How far east did she walk (in kilometers)
Neglect air resistance, as well as any energy absorbed by the pole, and clerify her altitude as she crosses the bar.
A box (m1=1.2 kg) is being pulled up an (not necessarily frictionless) incline by another mass (m2=0.85 kg), which is descending straight down. How much energy did the hanging mass lose
A rocket cruising past earth at 0.800c shoots a bullet out the back door, opposite the rocket's motion, at 0.900c relative to the rocket. What is the bullet's speed relative to the earth
The ball leaves his racket with a speed of 16.0 m/s at an angle 5.5 degrees above the horizontal. The horizontal distance to the net is 7.0 m and the net is 1.0 m high. Explain by how much did the ball clear the net?
As part of the safety investigation, two 1400 {rm kg} cars travelling at 23 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.7 {rm s} to stop, and (b) car that hits..
Two friends are carrying a crate of mass 200 kg up a flight of stairs. The crate has length 1.25 m and height 0.500 m, What is the magnitude of the upper person's force
block A (mass 2.28 kg) rests on a tabletop. It is connected by a horizontal cord passing over a light, frictionless pulley to a hanging block B (mass 2.57 kg ), evaluate the tension in the cord
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