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5.Work, Energy, Power and Collision
hard
કાર એક પરિભ્રમણ પૂર્ણ કરતી હોય,તો...
A
$\frac{H}{h} = 2$
B
$\frac{H}{h} = 3$
C
$\frac{H}{h} = 4$
D
$\frac{H}{h} = 5$
Solution
$v = \sqrt {2g\,H} $….(i)
$v = \sqrt {5g\,r} $….(ii)
$v = \sqrt {2gH} = \sqrt {5gr} $
$\therefore H = \frac{{5r}}{2}\ ….(iii)$
$H = h + 2r$
$⇒ \,r = \frac{{H – h}}{2}$
$\therefore H = \frac{5}{2}\left[ {\frac{{H – h}}{2}} \right]$
$\frac{H}{h} = 5$
Standard 11
Physics
