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:

Options

• 12 m

• 13 m

• 5 m

• None of these

Answer 1

13 m

Explanation:

R = u `sqrt((2"h")/"g")`

= `12sqrt(10/10)`

= 12 m

∴ S = `sqrt("R"^2+"r"^2)`

= 13 m