The power of a heart which beats 72 times in a minute is 1.2kW. Calculate the work done by heart for each beat.

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  1. Class 9
  2. Chapter 11 Class 9 - Work and Energy

Transcript

Extra Questions 4 The power of a heart which beats 72 times in a minute is 1.2kW. Calculate the work done by heart for each beat. Power of the heart = 1.2 kW = 1.2 ร— 1000 W = 1200 W Time taken = 1 minute = 60 seconds We know that Power = (๐‘Š๐‘œ๐‘Ÿ๐‘˜ ๐‘‘๐‘œ๐‘›๐‘’)/(๐‘‡๐‘–๐‘š๐‘’ ๐‘ก๐‘Ž๐‘˜๐‘’๐‘›) Work done = Power ร— Time = 1200 ร— 60 = 72000 J Now, Work done to beat 72 times = 72000 J Work done to beat 1 times = 72000/72 = 1000 J = 1000/1000 kJ = 1 kJ Work done to produce 1 heart beat is 1 kJ

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.