A sheet charge ps = 2nc/m2 is present at the plane x=3 in free space and line charge pi=20nc/m is located at x=1 and z=4 find magnitude of electric field intensity at the origin

Global warming was a major concern some people do not care global warming is fake it is not real the percentage of it happening  is slight 

Initial velocity,  u = 4.9 m/sfinal velocity = v m/sinitial height,  h₁ =  245 m    final height, h₂ = 0a = -9.8  m/s²time taken = t secondss = ut + 0.5at²⇒  (h₂-h₁) = ut + 0.5at²⇒  0-245 = 4.9t + 0.5×(-9.8)×t²⇒ -245 = 4.9t - 4.9t²⇒ 4.9t² -4.9t -245 =0solving it, we get   t = 7.59sv  = u +  at = 4.9 -9.8×7.59 = 4.9 - 74.38 = -69.48 m/svelocity is  69.48 m/s downward

How are period and frequency related to each other? dperiod is the reciprocal of frequency.