Tuesday

October 21, 2014

October 21, 2014

Posted by **Anonymous** on Thursday, June 28, 2012 at 8:19am.

- physics -
**Elena**, Friday, June 29, 2012 at 11:20am9.8 kcal min = 41 030.64 J/min

41 030.64 J/min60 4 = 9847353.6 J.

Useful work

mgh = 709.81200 = 823200 J.

mgh/t=823200/460 = 3430 J/min

η =(3430/41030.64) 100% = =0.086%

**Answer this Question**

**Related Questions**

physics - A 64 kg hiker climbs to the top of a 3700 m-high mountain. The climb ...

phsycis - A 62 kg hiker climbs to the top of a 3700 m-high mountain. The climb ...

Physics - An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the ...

Physics - An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the ...

Physics - An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the ...

Physics - An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the ...

Physics - An 80 kg man climbs a 50 m-high hill in 20 minutes. What is the ...

physics - S.O.S!!! In terms of saving energy, bicycling and walking are far more...

physics - (a) calculate the number of kilocalories needed to climb 232 stair ...

physics - A man whose mass is 75kg walks up a flight of 12 steps each 20 cm high...