During a workout, a person repeatedly lifts a 10 lb barbell through a distance o

Physics
Tutor: None Selected Time limit: 1 Day

Apr 15th, 2015

 

 Change to standard (SI) units:
1 pound = 0.454kg, so 10lb = 4.54kg
1 foot = 0.3048m, 1.5feet = 0.457m 
We have 135 Cal
1kcal (=1Cal) = 4184J,so 135Cal =  564840J
Take g=9.81m/s^2 (9.81N/kg)

Gravitational potential energy needed for 1 rep (raise mass) = mgh=4.54x9.81x0.547= 24.36J

No. of rep = 564840/24.36 =23187

 


Apr 15th, 2015

the answer was incorrect.

Apr 15th, 2015

too little time I rushed it hold on

Apr 15th, 2015

27756

Apr 15th, 2015

try that

Apr 15th, 2015

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