9th Class Science Work and energy Question Bank Work Power and Energy Formative Subjective Problems

  • question_answer
    The heart does 2.5J of work in each heart beat. How many times per minutes does it beat, if its power is 4 watt?

    Answer:

    \[W=2.5\,J\] \[n=?\] \[t=1\,\min =60s\] \[P=4w\] \[P=\frac{nw}{t}\,\,(or)\,\,n=\frac{pt}{w}=\frac{4\times 60}{2.5}=96\,times\]


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