 3
 0
This is probably really obvious but I have a hard time with vectors and really don't know what it's supposed to look like..I'm not even sure if to draw the grav. force vectors starting from the ends of the ropes or straight down from the centers of the bullets.
1. Homework Statement
Two identical bullets, which both weigh 500 mg are hanging off of ropes 40 cms in length. They were both given equal charges of the same type (both positive or both negative) after which they repelled from each other and remained fixed at a position such as to form a 60 degree angle between the ends of the ropes. Find the charges of the bullets and the force that tightens the ropes.
2. Homework Equations
Coulombs law F= k times q1q2/r^{2}
3. The Attempt at a Solution
Ok so I drew a triangle and by using trig laws I found that r= 34 cm=0.34 m. Also the grav. force on the two bullets is 0.00049 N. So now I should be able to find the force between the bullets from the grav. vectors and the angle and then solve for the charges except I have no idea as to how to do that? Also my drawing is attached.
1. Homework Statement
Two identical bullets, which both weigh 500 mg are hanging off of ropes 40 cms in length. They were both given equal charges of the same type (both positive or both negative) after which they repelled from each other and remained fixed at a position such as to form a 60 degree angle between the ends of the ropes. Find the charges of the bullets and the force that tightens the ropes.
2. Homework Equations
Coulombs law F= k times q1q2/r^{2}
3. The Attempt at a Solution
Ok so I drew a triangle and by using trig laws I found that r= 34 cm=0.34 m. Also the grav. force on the two bullets is 0.00049 N. So now I should be able to find the force between the bullets from the grav. vectors and the angle and then solve for the charges except I have no idea as to how to do that? Also my drawing is attached.
Attachments

2.4 KB Views: 282