Areal velocity equal to the magnitude of the cross product of vectors "AB" and "AC". This area can also be viewed as a vector with this magnitude, pointing in a direction perpendicular to the parallelogram; this vector is the cross product itself: Hence The areal velocity is this vector area divided by Δ"t" in the limit that Δ"t" becomes vanishingly small: But, formula_4 is the velocity vector formula_5 of the moving particle, so that On the other hand, the angular momentum of the particle is and hence the angular momentum equals 2"m" times the areal velocity. Conservation of areal velocity is a
This Is What Rock n' Roll Looks Like been used by Lady Gaga. Ian Drew of "Us Weekly" called the single "shocking" and "electric". Allison Stewart of "The Washington Post" gave "This Is What Rock ‘n’ Roll Looks Like” a mixed review, describing Porcelain Black as a "girl-fronted version of Mötley Crüe circa Dr. Feelgood". Jon Wiederhorn of "Inked" dubbed the song "a euphoric digital feast of raspy melodic vocals, four-to-the-floor beats, and keyboards that buzz like electric guitars." "This Is What Rock n' Roll Looks Like" debuted on the U.S. "Billboard" Hot Dance Club Songs at number forty-six, on the week ending July 18, 2011. The following