Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
If a person of mass M simply moved forward with speed V, his kinetic energy would be1/2 MV^2. However, in addition to possessing a forward motion, various parts of his body (such as the arms and legs) undergo rotation. Therefore, his total kinetic energy is the sum of the energy from his forward motion plus the rotational kinetic energy of his arms and legs. The purpose of this problem is to see how much this rotational motion contributes to the person's kinetic energy. Biomedical measurements show that the arms and hands together typically make up 14.0\% of a person's mass, while the legs and feet together account for 38.0\% . For a rough (but reasonable) calculation, we can model the arms and legs as thin uniform bars pivoting about the shoulder and hip, respectively. In a brisk walk, the arms and legs each move through an angle of about \pm 30\;^\circ (a total of 60\;^\circ) from the vertical in approximately 1 second. We shall assume that they are held straight, rather than being bent, which is not quite true. Let us consider a 75.0{\rm kg} person walking at 5.00{\rm km/h} having arms 70.0{\rm cm} long and legs 92.0{\rm cm} long.
1- What is the average angular velocity of his arms and legs?
2- 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.
3- What is the total kinetic energy due to both his forward motion and his rotation?
4- What percentage of his kinetic energy is due to the rotation of his legs and arms?
The speed of the block at the bottom of the track is vA = 13.1 m/s, and block experiences an average frictional force of 7.00 N while sliding up the track.
A system absorbs at a 45% efficiency in a location where average solar-energy hitting the solar pan- els is 210 W/m2. what volume of water can be heated in one hour
A window of a car is found to be covered with 0.6cm of ice. If the area of the window is 1 m2, and the ice is at -12 degrees Celsius, what is the minimum heat required to melt all the ice
A nuclear power plant produces an average of 4.90 × 103 MW of power during a year of operation. Find the corresponding change in mass of reactor fuel
A 240g block on a 60cm-long string swings in a circle on a horizontal, frictionless table at 70rpm.
Consider the 642 N weights held by two cables shown. The left-hand cable had tension T2 and makes an angle of thelta2 with ceiling. The right-hand cable had tension 460 N and makes an angle of 47 degrees with the ceiling.
The fundamental frequency of a pipe that is open at both ends is 598Hz. How long is this pipe
a disk is spinnning at a rate of 10 rad/s. a second disk of the same mass and shape, what is the final angular velocity of the two disks
A sound wave in air has a frequency of 264Hz and travels with a speed of 347m/s. How far apart are the wave crests
A container at 25°C holds 0.50 moles of helium at a pressure of 2.5 atm. What is the volume of the container
A stone is thrown vertically upward with a speed of 16.0 m/s. How fast is it moving when it reaches a height of 12 m? How long is required to reach this height?
A soccer ball is kicked with an initial horizontal velocity of 18 m/s and an initial vertical velocity of 21 m/s, How far from where it was kicked will the ball land
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd