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-- 16-- 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???