At heights of 10 to 30 km above the earth's surface, cosmic rays are continually striking oxygen and nitrogen atoms and producing π mesons, both charged and neutral. follow one of the π+ mesons on its way down. observer b is in the reference frame attached to the particle ( rocket frame ) and determines the average life of the meson to be 2 55 × 10-8s. suppose that the rocket frame moves at a speed u = 12c/13 relative to the earth's reference frame, and that observer a at rest in the earth's frame determines the average lifetime of the π-meson to be 6.63 × 10-8s. (a) how far does the π-meson move in the laboratory frame between its birth and decay ? (b) according to observer b how far does the particle move between birth and decay in the laboratory frame? note: you may ignore the effects of gravity on the particle motion which you should treat accong to chunics.

radiation warms things up temp rises convection currents air circ windy weather

more than, less

less than, more

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.  

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.