Subject Weight 777 9 Newtons Conversion 174 9 lbs 4 448 777 9 N Dumbbell Weight 20 pounds Conversion 20 lbs 4 448 88 96 N Number of Steps 10 Steps Height per Step 0 2 m step Compute the mechanical work and power for each trial and report all of the relevant data in the table below use area below chart if you want to show work not required Conditio n Tria l Displaceme nt m Work J Power W 2 m 1 555 8 J 904 53 W Time s 1 72 s 1 98 s 2 m 1 80 s 2 m 1 83 s 2 m Force N 777 9 N 777 9 N 777 9 N 777 9 N 1 555 8 J 1 555 8 J 1 555 8 J 2 15 s 2 m 2 475 s 2 m 866 91 N 866 91 N 1 733 83 J 1 733 83 J Unwei ghted Dumb bell 1 2 3 1 2 aver age 785 76 W 864 33 N 851 54 W 806 43 W 700 54 W 2 25 s 2 m 2 29 s 2 m 3 aver age 1 733 83 J 770 59 W 1 733 83 J 759 19 W 866 91 N 866 91 N Briefly answer the following questions Write your answers neatly in the spaces provided 1 Do the mechanical work and power values vary from trial to trial and between conditions Explain why they do or do not a The mechanical work values do not vary from trial to trial but they do vary between conditions This is because you calculate work values based off of the force values and the force values do not vary from trial to trial because it is based off of body weight body weight does not change Work values do vary between conditions because you are adding 20 pounds to your body weight in the second condition which will increase your force Also work is based off of distance and mass and neither of these values are being changed during trials Next the mechanical power values do vary from trial to trial and also between the different conditions This is due to calculating the power based off of the work and the time In regards to trial to trial calculations the power will change because even though our work value stays constant the time it takes for each trial varies Between the two conditions the work values and the time values are both being changed so therefore our mechanical power values will also vary 2 Do you think the results of either of these TESTs are a good indication of YOUR maximal anaerobic capacity i e your maximal power output Explain why or why not and if not what sort of test would be you may want to think in terms of exercise physiology just as much as biomechanics a I believe that these tests are not a good indication of my maximal anaerobic capacity The first reason I think this is because I am not used to climbing stairs as part of the way that I exercise When I choose to workout I am either completing long distance bike rides 5 plus miles or I am completing strength exercises using dumbbells this form of test does not match up with the way that I am used to exercise I was also not prepared mentally to complete this test on this day so I could have performed better if I was more prepared with a warm up The test that would show more accurate results of my maximal anaerobic capacity would be the wingate test due to the fact that I feel more comfortable on a bike than I do spring up the stairs 3 Calculations clearly indicate your answer and show your work in the space provided a How many total calories did you burn to complete all 6 trials assume 0 000239 Kcal J only 25 efficiency i Weighted 1 1 555 8 J 0 000239 Kcal J 0 372 Kcal 2 0 372 Kcal 3 trials 1 116 Kcal ii 20 pound dumbell 1 1 733 83 J 0 000239 kcal 0 414 Kcal 2 0 414 3 trials 1 242 Kcal iii Total Calories 1 1 116 Kcal 1 242 Kcal 2 358 Calories b Using the Law of Conservation of Mechanical Energy formula e g kinetic energy potential energy calculate what your velocity would be just prior to impact would be if you fell to the ground from the height of the stairs Total energy work done potential mgh kinetic mv 2 2 1 2 79 33 V 2 79 33 x 9 81 x 2m 39 66 V 2 1556 45 V2 39 24 V 6 264 m s2 i ii iii iv v
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