Answer to Question #222689 in Mechanics | Relativity for SAmanta Ariel

Question

What force is necessary to keep a body of mass 0.8kg moving in a horizontal circle of radius 0.7m with period 0.5s.

Answer 1

Given:

$m=0.8\:\rm kg$

$r=0.7\:\rm m$

$T=0.5\:\rm s$

The Newton's second law says

$$F=ma=\frac{mv^2}{r}=\frac{4\pi^2rm}{T^2}$$

$$F=\frac{4\pi^2*0.7*0.8}{0.5^2}=88\:\rm N$$