In Figure 4, a ball on the end of a string is spun in a vertical circle of radiu

Question

In Figure 4, a ball on the end of a string is spun in a vertical circle of radius r = 1.5 m. What is the centripetal force? a. Friction b. Gravity c. Tension d. Normal Symbolically, what is the net force on the ball at the bottom of its path? Gravity points in the negative y-direction. a. F_T + mg b. F_T - mg c. F_T d. -mg If the speed of the ball at the bottom is 5.4 m/s and the mass of the ball is 40.0 g, what is the tension force in the string? a. 1.2 N b. 0.8 N c. 1169.6 N d. 0.4 N What must the minimum speed of the ball at the top be to prevent the string from going slack? a. 7.7 m/s b. 1.7 m/s c. 2.1 m/s d. 3.9 m/s

Explanation / Answer

15) correct option is (c)

16) correct option is (b)

17) vb = 5.4 m/s, m = 40 g

mv^2/r = FT - mg

0.04*5.4^2/1.5 = FT - 0.04*9.8

FT = 1.2 N

correct option is (a)

18) mg = mv^2/r

9.8 = v^2/1.5

v = 3.83 m/s

correct option is (d)

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