The half life of .t meson at rest is 2.5 × 10-8 second. a beam of π+ mesons is generated at a point 15 meters from a detector. only ½ of the π+mesons live to reach the detector. find the speed of the t mesons, specifying whether you have used time dilation or length contraction

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it

pecialized keyboards

there are no components of a physical goal mentioned on the list of choices that you've provided.