How Much Heat Does a Weightlifter Produce in a Lift?

[chukie]

Homework Statement

A weight lifter manages to lift a 147 kg weight a distance of 1.1 m. Treat her as a thermodynamic system and find how much heat (in kcal) she must put out if her internal energy decreases by 3620 J during the lift.

Homework Equations

delta U=Q-W

The Attempt at a Solution

-3620= Q-(9.8*147*1.1)
Q=-2035.34

I was wondering wut the units of Q are? if it's in joules how do i convert to kcal?

Thanks in advance!

 

[mgb_phys]

Q is in Joules because you have used consistent metric units.
A kCal is approx 4184J - it's the energy need to heat 1cc of water 1deg C.