Calculate the relativistic energy e and momentum p of a proton of mass m = 1 gev/c^2 moving at velocity u = 0.9c in the laboratory frame. then calculate the " in-variant, mass" k^2-e^2-p^2c^2 in the laboratory frame. compare your result to the invariant mass k'^2 in the frame where the proton is at rest (v'=0) what do you conclude?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is