Hi, Greco. I am using the following formula to solve Ballistic Missile: sqrt(5*G*m_1/4*r_1). Given the following: m_1=5*10^24kg; r_1=6000;alpha=30 degrees;r_2=(5/2)r_1; G= 6.674*10^-11kg/m^3s^-2.
I thought I did it correctly using the proper formula.
My answer was incorrect. I have one shot left. I might not be using the formula correctly. Please help.
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, Roma. I am having the same problem as you. If I find out I will let you know. I am still trying to solve the problem on the missile.
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. may be we type sometimes in a wrong way.
hey guy, note that the radius is in km for the ballistic question.
for the propulsion question v_f=v_e*LN(m_1/m_f)
Hi, guys! What's about doppler shift? Can u tell me formulas?
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?
it ends up being 1/((1-(the percentage of mass loss)
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?
Hil your answer should be 8337.92 m/s
Hi, Greco. Thanks I got the same answer on the second try.
