Pions at rest have an average lifetime of 2.60 x 10-8 s. A particular accelerated beam of pions is measured to have an average lifetime of 4.40 x 10-8 s. What is the speed of the pions in the beam?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

There are two routes similar in terrain; however, one route has an incline of approximately 28 degrees, and you must decide on which route to take. what is the maximum road grade that your fully loaded ecv can climb?

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?