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1. ### Electric Fields and rods

Nevermind, I got it.
2. ### Electric Fields and rods

Here's my problem: Three 10-cm-long rods form an equilateral triangle. Two of the rods are charged to + 10 nC, the third to -10 nC. What is the electric field strength at the center of the triangle? Answer in back of book: 1.08 * 10^5 N/C By looking at the corresponding section, it...
3. ### Inelastic Collisions in One Dimension

Nevermind, I can't believe I didn't think of this earlier. I just realized that, after the collision, the kinetic energy transfers completely to thermal energy, so I was able to find va2 and vb2 from K = 1/2v^2. Then, applying the equation for conservation of momentum, I was able to find vb1.
4. ### Inelastic Collisions in One Dimension

Here's my problem: Car A (mass 970 kg) is stopped at a traffic light when it is rear-ended by car B (mass 1600 kg). Both cars then slide with locked wheels until the frictional force from the slick road (with a low mk of 0.23) stops them, at distances dA = 5.8 m and dB = 3.6 m. What are the...