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The heart of man pumps 4litres of blood per minute at a pressure of 130mm of mercuryIf density of mercury is 13.6g/cm3.Find the power of heart
0.02w
0.2w
3.2w
1.2w
WORK DONE W IS GIVEN BYW = F X DF = PA (PRESSURE X AREA)OR W = P A.D = P (AD) = P VOR WORK DONE = PRESSURE X VOLUMEHERE PRESSURE P = 130mm OF Hg = 105 * 130/760 OR P = 13 x 105 / 76 PaVOLUME V = 4L = 4000 cm3 = 4x10-3 m3HENCE W = PV = (13 x 105 / 76 ) x 4x10-3OR Wok done = 68.42 JOULESNOW THE PUMPING OF 4 L OF BLOOD IS DONE IN 1min = 60sTHUS POWER = WORK DONE/TIMEOR POWER = 68.42/60 = 1.1403 WATTS
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