A pi is a subatomic particle called a Pion that is positively charged. It has a mean lifetime of about 26 ns (26x10-9 s) as measured in the lion's frame of reference. Suppose a pion is created in the atmosphere and is moving at 0.507c relative to a stationary observer on Earth. How long does the pion "live" in ns according to the Earth bound observer

Shelly experiences a backward jolt when the driver starts the school bus. which of the following explains this phenomenon? a. the inertia of shelly b. the inertia of the bus c. the normal force of the seats on shelly d. the net force acting on shelly in a backward direction e. a zero net force acting on shelly

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?