A1000-kg car is traveling north at 20.0 m/s. a 1500-kg car is traveling north at 36.0 m/s. the 1500-kg collides with the rear of the 1000- kg car and they lock together. ignoring external forces acting during the collision, what is the velocity of the cars immediately after the collision? (a) 56.0 m/s north (b) 29.6 m/s north (c) 13.6 m/s south (d) 8.00 m/s south (e) 28.0 m/s north

Abicycle slows down when the rider applies the brakes. what type of energy transformation is involved in this example? a. kinetic energy into heat energy b. heat energy into potential energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy

How can you increase the strength of an electromagnet?

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c