Physics: Circular motion? Please help me!

Posted on 2017-09-26 18:03:00 in Physics by KINLY

Need some help answering this two part question. I've attached the diagram for it. 

1. The figure shows a ball, tethered to a string, going around in a circle (radius 1.20 m). One revolution takes 0.60 s. The multiple images show the ball at 24 equally spaced times during one revolution. 
What is the speed of the ball? 

2. The arrows show the velocity when the ball is at the arrow's tail. Position 0 is at the top. Construct the vector Δv0 = v1−v-1 by graphically subtracting the corresponding arrows. This difference represents the average velocity change as the ball passes from point -1 to point 1 at the top of the circle. Plot Δv0 with its tail on the ball at position 0. 

Determine which of the following statements are true; 


The acceleration a0 points in the same direction as Δv0. 
As the ball passes position 6, Δv6 points in the same direction as it did at position 0. 
Δv0 points in the same direction as v0. 
The acceleration is always constant. 
Δv0 points towards the centre of the circle.

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