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Answers posted by ainaraichal
Questions
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A bob of mass m attached to an inextensible string of length $l$ is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed $\omega$ rad/s about the vertical. About the point of suspension :
answered
Mar 22, 2019
Angular momentumesh changes its direction
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A bob of mass m attached to an inextensible string of length / is suspended from a vertical support . The bob rotates in a horizontal circle with an angular speed $\;w\;$ rad/s about the verticle . About the point of suspension :
answered
Mar 22, 2019
b)angular momentum changes its direction
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A person trying to lose weight by burning fat lifts a mass of $10\; kg$ upto a height of $1\; m \;1000\; times$. Assume that the potential energy lost each time he lowers the mass is dissipated. How much fat will he use up considering the work done only when the weight is lifted up ? Fat supplies $3.8 \times 10^7 \;J$ of energy per kg which is converted to mechanical energy with a $20\%$ efficiency rate. Take $g=9.8 \;ms^{−2}$ :
answered
Mar 22, 2019
Efficiency =20÷100=0.2 potential energy=mgh=1×9.8×1000 Work done=energy =m×3.8×10_7 20÷100=10×9.8×10
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