1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Regents Problems Best Solution

  1. Sep 28, 2008 #1
    1. The problem statement, all variables and given/known data
    Problems in pics from regents site.



    2. Relevant equations

    3. The attempt at a solution
    16 and 17--
    U = C_v 300-275 but how do i find C_v
    17 ---is zero from properties of adiabatic process.

    23 How am I supposed to know its 4 without memorizing the resistance
    i know R = rho L/a but I would have to memorize rho.

    6 ---it has to be 3 because of maximum magnitude = 7

    18 and 43----Same as 23 ---

    I use v= at + v_o to find half of time in air above horizontal from starting point
    for both balls then
    used x= 0.5 g t^2 to find the rest of the time and then figured out ratio
    but this way is very computationally intensive is there a better way.

    30-- am I supposed to know an equation for n(lambda)

    19--- same as 23

    29-- the frequency stays the same but why???
  2. jcsd
  3. Oct 2, 2008 #2
    Does anyone know why the frequency stays the same as light passes through a medium but the wavelength and speed change?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook