Answer :
(a) The gravitational force is 980 N
(b) The tension in the string is 441.49 N
Given : Mass of the ball = 100 gram
Length of the string = 1.07 m
the acceleration = 9.8 [tex]m/s^2[/tex]
(a) The gravitational force ;
W = mg
this implies W = (100)( 9.8)
W = 980 N
thus the gravitational force is 980 N
(b) The tension can be calculated by adding the gravitational force and equating it to the mv^2/r
W + T = [tex]\frac{mv^2}{r}[/tex]
W + T = [tex]\frac{100 X 3.9^2}{1.07}[/tex]
980 + T = 1421.49
T = 1421.49 - 980
this implies T = 441.49 N
thus tension = 441.49 N
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