Answer
(a) $1.40W$
(b) $121KJ$
(c) $171m$
Work Step by Step
(a) We can find the power of the heart as
$P=(133\frac{N}{cm^2})(105\frac{cm^3}{s})(\frac{1m}{100cm})=1.40W$
(b) The energy expanded by the heart in a day is given as
$E=Pt$
We plug in the known values to obtain:
$E=(1.40W)(3600\frac{s}{hr})(24\frac{hr}{day})=121KJ$
(c) We know that
$E=mgh$
This can be rearranged as
$h=\frac{E}{mg}$
We plug in the known values to obtain:
$h=\frac{1.21\times 10^5}{(72)(9.81)}=171m$
