ROMA

time is not related for first part? in velocity formula there is no time, so we should not worry about 290s and 145s for first part? Thanks

Hi Damon how did you find x=distance out from cg=0.05sinT? I have different numbers in my problem and I did not understand how to find x. Thanks

Hi, did you solve rocket problem. I gopt it wrong. How to find? Can you help please?

Hi Hil, can you help me in rocket problem please? I used correct formula but I don't know how to find m_0/m? It is given 10% of mass in 290s and asking v in 145 s?

Hi billy, It is given that 10% of mass in 290 sec and asking in 145s. I used m_0/m= 10/9 which is in 290sec I guess. and I got wrong ans. I have only one submission left. I don't know how to find m_0/m in 145sec. Please can you do it pls?

Hi hil, I did missile problem and I am seeing you are typing correct formula. Just remember to convert r_1 in meter( I think you did) and do calculate in your own calculater, not in edx one. Because sometimes I get wrong when I did in edx one calculator....

Hi Anonymous, I know the formula for propulsion, but I don't know how to find m_1/m_f in 145sec. It is given that 10% of mass in 290sec. can you tell how to find?

you mean 10/9? I already used this and got wrong. Can you do in the way how you did? I mean can you show here please?

Hi Teresa, can you do rocket problem me pls?

Hi Greco, can you do rocket problem pls?

Hi Teresa, in my problem, question says The rocket burns 10 % of its mass in 290 s (assume the burn rate is constant). What is the speed of the rocket after a burn time of 145.0 s? How did you find 4.5% is burned in 155 sec? Pls. Thank you very much

Thank you very much Teresa. I got green check. Now time for rular one..

"ln" is like log..it is in your calculator