Proper velocity by Hermann Minkowski's flat-space metric equation . Here a reference map frame of yardsticks and synchronized clocks define map position x and map time "t" respectively, and the "d" preceding a coordinate means infinitesimal change. A bit of manipulation allows one to show that proper velocity where as usual coordinate velocity . Thus finite "w" ensures that "v" is less than lightspeed "c". By grouping "γ" with v in the expression for relativistic momentum p, proper velocity also extends the Newtonian form of momentum as mass times velocity to high speeds without a need for relativistic mass. The proper velocity
This Is What Rock n' Roll Looks Like week, the song went up two spots, peaking at number forty-four. The following two weeks, "This Is What Rock n' Roll Looks Like" remained stationary at number forty-four on the weeks ending August 1, 2011 and August 8, 2011, respectively. A music video for "This Is What Rock n' Roll Looks Like" was shot and directed by Sanaa Hamri at Citrus College in Glendora, California. Porcelain Black discussed the idea behind the music video for "This Is What Rock n' Roll Looks Like" with AOL's Carlos Ramirez, stating it was based on real life experiences. After Porcelain Black's mother had