1. Bell Ringer
A charged object is hanging from the ceiling being repelled by another charged object, also hanging from the ceiling. One has a charge of 9C while the other has a charge of 12C. If they are being repelled by a force of 20N, what is the distance between them?
EXTRA CREDIT! (Not really) If they are separated by an angle of 15 degrees, and both objects weigh the same, what is the mass of one of the objects? (DRAW FORCE DIAGRAMS)

2. Practice 1/4
You are placed in a big bucket (total mass=139kg) and then spun around in a giant horizontal circle. You complete a circle every .54s and the distance between you and the center of the circle is 4.4m. How much force does it take to keep you going in that circle?
If the force turning you in this circle were doubled, how fast would you be going?

3. Practice 2/4
You are doing a lab with your friends where you have tied a 4.52kg hamburger to the end of a cord and you proceed to whirl it around your heads. The radius of your cord is 0.9m. If the hamburger completes 7 rotations every 3.6s, what is its velocity?
How much force does it take to keep the burger moving in a circle?

4. Practice 3/4
A 1233kg car is driving down into a valley of radius 42m. If the car travels with a constant velocity of 25m/s, how much normal force acts on the car at the bottom of the valley?

5. Practice 4/4
You are riding on a giant Ferris Wheel. The distance between your seat and the wheel’s center is 60m. The Ferris Wheel carries people around at a constant velocity. To make the kind of boring ride more interesting, all safety restraints have been removed. If you have a mass of 74kg, what is the fastest speed the Ferris Wheel can have without the riders at the top flying off and being launched into an early grave?
What would your normal force be at the bottom if you maintained that same speed the whole time?