Aphoton has encrgy of 50 mev and is moving along the +a axis. another photon has energy of 200 mev and is moving along the -y axis (a) what is the total energy of the system? what is its total momentum? (b) if a single particle had the same energy and momentum, what would its mass be? what would its direction of travel and what would its spoed be?

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

Carbon 14 is a naturally occurring stable

Rank the six combinations of electric charges on the basis of the electric force acting on q1. define forces pointing to the right as positive and forces pointing to the left as negative. rank positive forces as larger than negative forces. q1,q2,q3 = positive(+) q1 = + q2 = + q3 = - q1 = + q2= - q3= + q1= - q2= + q3= + q1= + q2= - q3= - q1,q2,q3 = negative