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Posts: 389
Joined: Nov 12 2014
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Dec 9 2014 10:45pm
helpp!!!
Of the methods listed below, which is the most accurate for measuring metabolic energy expenditure during a bout of exercise in a specific subject?
A.) Measurment of heart rate using a stopwatch
B.) Measurement of VO2 using respirometry
C.) Assessment of work rate from the readout of an exercise bike
D.) AcSM (2000) equations for predicting V02
How much work is done against gravity as a 50 kg barbell is raised from the floor to a height of 2m above the floor?
A.) 25 J
B.) 100 J
C.) 200 J
D.) None of the above


Member
Posts: 21,893
Joined: Mar 27 2009
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Dec 9 2014 11:00pm
Know it's a few mins late but...

dunno first one
second one:
W = F*d
W = 50*9.81*2 = 25Jish

third one:
Moment = F*d
d = 0.028m
F*0.028 = 14
F = 14/0.028
F = 500N

fourth one:
F = ma
Fh = 90*0.3
Fh = 27N
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