Question

9.375 QUESTION 11 A child attaches a rubber ball to a string an whirls it around in horizontal circle overhead. If the string is 0.25 meters long, and the ball's speed is 5 m/s, what is the magnitude, in m/s2 of the ball's centripetal acceleration? QUESTION 12 In the previous question, what us the direction of the bal's acceleration? A. Along the direction of the ball's velocity B. Away from the center of the circle Opposite to the direction of the ball's velocity Toward the center of the circle с. D. QUESTION 13 MacBook Pro

Answer 1

11)

L = 0.25 m

v = 5 m/s

magnitude of centripetal acceleration , a = v^2/L

magnitude of centripetal acceleration , a = 5^2/0.25

magnitude of centripetal acceleration , a = 100 m/s^2

the magnitude of centripetal acceleration is 100 m/s^2

12)

as the acceleration is centripetal . the acceleration is towards the center of the circle

hence , the correct option is

D) Toward the center of the circle