Acue ball of mass m1 = 0.305 kg is shot at another billiard ball, with mass m2 = 0.545 kg, which is at rest. the cue ball has an initial speed of v = 5.5 m/s in the positive direction. assume that the collision is elastic and exactly head-on. part (a) what is the horizontal component of the billiard ball's velocity, v2f, after the collision, in meters per second? a numeric value is expected and not an expression part (b) what is the horizontal component of the cue ball's final velocity, v1f in meters per second? a numeric value is expected and not an expression

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

An electric current is flowing through the cord below.what will happen to this current if a magnet is brought near the cord? a. the electric current will stop flowing. b. it will exert a force on the voltage. c. the resistance of the wire will decrease. d. it will exert a force on the electric current.

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?