1. a motorcycle with a mass of 200 kg can accelerate from 0 to 30 m/s in 3 seconds. a. assuming all of the force generated by the engine goes into acceleration of the motorcycle, how much force is the engine producing? show your work. b. what would happen if the coefficient of friction between the tire and the pavement increased greatly? explain what would happen, including whether the acceleration of the motorcycle would stay the same, increase, or decrease, and tell why you think this is.

a. 2000 N

b. acceleration of the motorcycle would decrease

Explanation:

a. acceleration = (final speed - initial speed)/time

a = (30 - 0)/3 = 10 m/(s^2)

Force = mass * acceleration

F = 200 * 10 = 2000 N

b. If the the coefficient of friction between the tire and the pavement increased greatly, part of the force generated by the engine would go to overcome this friction, then the force that goes into acceleration of the motorcycle would be less than case a, as a consequence, its acceleration would decrease (mass remains the same).

3. dark matter

empty space could also be a simple vacuum