Physics PLEASE

Most popular questions and responses by Physics PLEASE
  1. Physics PLEASE

    I'm trying to solve this problem Calculate (a) how long it took King Kong to fall straight down form the top of the Empire State Building (380 m high), and (b) his velocity just before "landing". My teacher said try and rearagne this equation for t X = Xo

    asked on June 23, 2009
  2. Physics Please

    You want to show that V^2 - Vo^2 = 2 a (X - Xo) first rewrite that as: (V-Vo)(V+Vo) = 2a (X-Xo) now your average velocity during the interval = (V+Vo)/2 so X = Xo + t(V+Vo)/2 but V = Vo + a t so t = (V-Vo)/a so X = Xo +(V-Vo)(V+Vo)/2a we are there.

    asked on June 19, 2009
  3. Physics PLEASE

    I'm trying to derive the formula v^2 = v0^2 + 2a(x-x0) were zeros are subscripts my book tells me to derive it this way use the definition of average velocity to derive a formula for x use the formula for average velocity when constant acceleration is

    asked on June 19, 2009
  4. Physics PLEASE

    I'm trying to solve this problem Calculate (a) how long it took King Kong to fall straight down form the top of the Empire State Building (380 m high), and (b) his velocity just before "landing". My teacher said try and rearagne this equation for t X = Xo

    asked on June 23, 2009
  5. Physics PLEASE

    Of course you have to rearrange it X -Xo = (V-Vo)(V+Vo)/2a (X-Xo)2a = (V-Vo)(V+Vo) 2 a (X-Xo) = V^2-Vo^2 ok to go from the first line to the second line you multiply by 2a I agree but what allows you to just put parenthsess around the X-Xo Thank You!

    asked on June 19, 2009
  1. Physics PLEASE

    oh... Xo is not zero

    posted on June 23, 2009
  2. Physics PLEASE

    thanks

    posted on June 23, 2009
  3. Physics Please

    This is what i did x = 2^-1(v0 + v)a^-1(v-v0) + x0 simplfy x = (a2)^-1(v^2 -v0^2)+ x0 (x = (a2)^-1(v^2 -v0^2)+ x0)2a (2a)x = (v^2-v0^2) + x0 (2a)x - x0 = (v^2-v0^2) + x0 - x0 (2a)x - x0 + v0^2= (v^2 - v0^2) + v0^2 (2a)x - x0 + v0^2 = v^2 i do not see were

    posted on June 19, 2009