WORK DONE W IS GIVEN BY



W = F.D



F = PA (PRESSURE X AREA)



OR W = P A.D = P (AD) = P V



OR WORK DONE = PRESSURE X VOLUME



HERE PRESSURE P = 130mm OF Hg = 10⁵ * 130/760

OR P = 13 x 10⁵ / 76 Pa

VOLUME V = 4L = 4000 cm³ = 4x10^-3 m³



HENCE W = PV = (13 x 10⁵ / 76 ) x 4x10^-3



OR Wok done  = 68.42 JOULES



NOW THE PUMPING OF 4 L OF BLOOD IS DONE IN 1min = 60s



THUS POWER = WORK DONE/TIME



OR POWER = 68.42/60 = 1.1403 WATTS