Question

A circular disc of radius r = 5m is rotating in horizontal plane about y-axis. Y-axis is vertical axis passing through the centre of disc and x-z is the horizontal plane at ground. The height of disc above ground is h = 5 m. Small particles are ejecting from disc in horizontal direction with speed 12 m/s from the circumference of disc then the distance of these particles from origin when they hits the x-z plane is –

• A. 12 m
• B. 13 m
• C. 5 m
• D. None of these

Answer 1

Answer: (B)

13 m

Answer 2

R = u $\sqrt{\frac{2h}{g}}$= 12 $\sqrt{\frac{10}{10}}$ = 12 m

\ S = $\sqrt{R^{2} + r^{2}}$ = 13 m