So for both of the following problems I solved for part a but then I kept gettin

Question

So for both of the following problems I solved for part a but then I kept getting part B incorrect and i don't know what I did wrong.

Problem 1) Three lead balls of mass

For part A my answer was 4.3x10^-9 N but for part B I got 35.1 degrees for the magnitude and it said it was incorrect.

So I need HELP WITH PART B PLEASE!

Problem 2) An ancient and deadly weapon, a sling consists of two braided cords, each about half an arm's length long, attached to a leather pocket. The pocket is loaded with a projectile made of lead, carved rock, or clay and made to swing in a vertical circle as shown in the figure below. The projectile is released by letting go of one end of the cord. (Assume the radius of the circle the sling makes is 1.0 m.)

(a) If a Roman soldier can swing the sling at a rate of 6.5 rotations per second, what is the maximum range of his 109-g projectile? (Ignore air drag.)

my answer was 170.2 meters and it was CORRECT

(b) What is the maximum tension in each cord during the rotation?

For part B i got 182 N and it was INCORRECT SO PLEASE HELP WITH PART B PLEASE!

Three lead balls of mass m1 = 14kg, m2 = 28 kg, and m3 = 8.9 kg are arranged as shown in the figure below. Find the total gravitational force exerted by balls 1 and 2 on ball 3. Be sure to give the magnitude and the direction of this force. For part A my answer was 4.3x10^ - 9 N but for part B I got 35.1 degrees for the magnitude and it said it was incorrect. An ancient and deadly weapon, a sling consists of two braided cords, each about half an arm's length long, attached to a leather pocket. The pocket is loaded with a projectile made of lead, carved rock, or clay and made to swing in a vertical circle as shown in the figure below. The projectile is released by letting go of one end of the cord. (Assume the radius of the circle the sling makes is 1.0 m.) If a Roman soldier can swing the sling at a rate of 6.5 rotations per second, what is the maximum range of his 109 - g projectile? (Ignore air drag.) What is the maximum tension in each cord during the rotation?

Explanation / Answer

Velocity of projectile in circular motion (assumed to be constant) .. r=1m
v = d/t = (7.10rev x 2?1.0 / 1s = 44.60 m/s

Max range (R) when released at ? = 45

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