Time of flight (TOF) is routinely used to distinguish between different particle species. Calculate the difference in time interval required for a proton 
and a muon (rest mass: 106 
to travel 2.5m, if each have a momentum of 255 MeV/c.
A. 8 ns
B. 15 ns
C. 18 ns
D. 10 ns
A. 8 ns
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An engine is being used to raise a 89 kg crate vertically upward. If the power output of the engine is 1620 W, how long does it take the engine to lift the crate a vertical distance of 18.7 m? Friction in the system is negligible
What will be an ideal response?
O-type stars
A) have lifetimes long enough for advanced life to evolve B) have lifetimes long enough for planets to form and for life to appear, but not long enough for advanced life C) do not contain enough heavy elements to form planets D) have lifetimes too short for planet formation
A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
A. 8.2 m B. 15.8 m C. 13.5 m D. 11.0 m E. 4.9 m
You spin your little brother on a "helicopter" ride, which means you hold hands and spin around a vertical axis, usually resulting in the little brother's feet lifting off the ground. During the "ride", the acceleration of your brother is
A. outward from you because circular paths always have centrifugal acceleration. B. outward from you, but he pushes you inward. C. inward toward you, but you push him outward. D. tangential to the circular path, and that is why it takes two hands to give helicopter rides. E. inward toward you, and you must pull him inward.