PEDS200 Lecture : Lab 1 Notes On Ergometers

51 views10 pages

taupewalrus464

22 Dec 2011

School

University of Alberta

Department

Physical Education and Sport

Course

PEDS200

Professor

Dan Syrotuik

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Ergometer y ergometer: ergo means work, meter means measure. Force (n) = m x a y mass (m) = resistance: kg, kp y acceleration (a) = gravity = 9. 81 m/s^2. Work = f x d (n x m; j) y d = flywheel of bike or rowing ergometer y monark = 6m gjessing = 1m. Power = f x d / t (watts; kg x m/min; n x m/s) y respiratory exchange ration (rer): is the ratio of the volume of co2 produced to the. Lab 2: energy expenditure and efficiency y ex. If glucose (c6h12o6) is metabolized, then rer would be 1. 0 ( 6vco2 / 6vo2) volume of o2 consumed y c6h12o6 + 6o2 = 6vco2/6vo2 y caloric equivalents: appendix b rer of 1. 0 = 5. 047 kcal/o2. Calculations y calculate the gross efficiency for rowing at 6000 j of work. Rer = 0. 89 and o2 = 1. 3 l.

Related Questions

A weightlifter has a basal metabolic rate of 80.0W. As he is working out, his metabolic rate increases by about 650W. (a) how many hours does it take him to work off a 450-calorie bagel if he stays in bed all day? (b) how long does it take him if he's working out? (c) calculate the amount of mechanical work necessary to lift a 120-kg barbell 2.00m (d) He drops the barbell to the floor and lifts it repeatedly. How many times per minute must he repeat this process to do an amount of mechanical work equivalent to his metabolic rate increase of 650 W during exercise? (e) Could he actually do repetitions at the rate found in part (d) at the given metabolic level. Explain?

1. A stone of mass 5.0 kg is dropped from a height of 2.0 m abovethe ground and falls
freely under the action of gravity. Neglect the air resistanceacting on the stone.
A. Calculate the potential energy (PE), kinetic energy (KE) and thetotal mechanical
energy of the stone at the point of release.
B. The same (that is, PE, KE and the total energy) of the stone ata height of 0.5 m
above the ground as it falls.
C. Using the conservation of mechanical energy calculate the speedof the stone just
before it strikes the ground. What is the total mechanical energyof the stone in this
case? Does it verify the principle of conservation of energy?
D. Calculate the work done by the force of gravity

Several studies indicate that the elastic properties of tendons can change in response to exercise. In one study, guinea fowl were divided into a group that ran for 30 minutes a day on a treadmill, and a control group that was kept in their cages. After 12 weeks, the researchers measured the mechanical properties of the gastrocnemius tendon in each bird. The results for one control bird and one treadmill bird are shown in (Figure 1).

Part A

Treating the tendon as an ideal spring, what is the force constant for the control bird?

Part B

By how much does the control bird’s tendon need to be stretched in order to have the same amount of stored energy as the tendon of the treadmill bird at a deformation of 1.0 mm?

lemongnat815

PEDS200 Lecture : Lab 1 Notes On Ergometers

Document Summary

Get access

Related textbook solutions

Physics: Principles with Applications

Related Documents

PEDS200 Lecture : Lab 1 Notes

BPK 310 Midterm: MT Study Questions

BPK 310 Lecture 1: BPK 310 study questions

Related Questions