If a muon is traveling at 70% of the speed of light, how long does it take to decay in the observer's rest frame (i. e., what is the observed lifetime τμ of the muon)? express your answer in microseconds to two significant figures.

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not

Which of the following is not an appropriate unit for acceleration? (kg/12 mihr? m/min/sec cm/30c?