If the heart works 60 joules in one minute, what is its power ?

What is a joule?

100 joule of work must be done to move a charge of -200 C from the point A to point B. What is the potential difference.?

A human heart discharges 75 cc of blood the through the artcries at each beat against an average pressure of 10 cm ofmercutry.Assuming that the pulse frequency is 72 per minute,the rate of working of heart is watt is (density of mercury = 13.6 g cm^-3 and g = 9.8 m s^(-2) ):