Answer to Question #131538 in Classical Mechanics for Rethabile

Question #131538
A bead of mass m = 5000 g is released from point A and slides on the frictionless track as shown below. When it reaches height B, it is travelling at 8.64 km/h.Determine the change in height between A and B.
1
Expert's answer
2020-09-08T09:14:21-0400

solution:-

given data

mass of bead(m)=5kg

velocity of bead at point A (vA)=0m/s

velocity of bead at point B(VB)=8.64km/h =2.4m/s

figure is shown below






there is no loss of energy between point A and B because there are no friction present.

by applying energy conservation law


EA=EBE_A=E_B


mgh1+12mvA2=mgh2+12mvB2mgh_1+\frac{1}{2}mv_A^2=mgh_2+\frac{1}{2}mv_B^2


mgh1mgh2=12mvB212mvA2mgh_1-mgh_2=\frac{1}{2}mv_B^2-\frac{1}{2}mv_A^2


therefore change in height can be written as


(h1h2)=12g(vB2vA2)(h_1-h_2)=\frac{1}{2g}(v_B^2-v_A^2)


by putting the value of vA , vB and g


(h1h2)=12×9.8(2.4202)(h_1-h_2)=\frac{1}{2\times9.8}(2.4^2-0^2)


(h1h2)=0.29m\fcolorbox{aqua}{yellow}{$(h_1-h_2)=0.29m$}


therefore change in height is 0.29m.




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