Meteo
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Theres some calculations in this problem that I just don't get...
Start with the equations for initial and final momenta and kinetic energies and derive the
theoretical equation for the ratio fo K_f to K_i
P_i=Mv_i
P_f=(M+m)v_f
K_i=1/2Mv_i^2
K_f=1/2(M+m)V_f^2
K_f/K_i=1/2(M+m)v_f^2/1/2Mv_i^2=M/(M+m) this part I don't get. I only get
(M+m)/M and I am assuming that v_f and v_i
cancel out...
I basically solved for M=P_i/v_i and (M+m)=P_f/v_f<br />
I plug it into kinetic energy equations and get K_f/K_i=P_f/P_i I guess <br /> <br /> v_f and v_i cancel out? Is this answer correct?
Start with the equations for initial and final momenta and kinetic energies and derive the
theoretical equation for the ratio fo K_f to K_i
P_i=Mv_i
P_f=(M+m)v_f
K_i=1/2Mv_i^2
K_f=1/2(M+m)V_f^2
K_f/K_i=1/2(M+m)v_f^2/1/2Mv_i^2=M/(M+m) this part I don't get. I only get
(M+m)/M and I am assuming that v_f and v_i
cancel out...
I basically solved for M=P_i/v_i and (M+m)=P_f/v_f<br />
I plug it into kinetic energy equations and get K_f/K_i=P_f/P_i I guess <br /> <br /> v_f and v_i cancel out? Is this answer correct?