document.write( "Question 720774: Use v = - 0.0098t + c ln R, where v is the velocity of the rocket, t is firing time and c is velocity of exhaust R is ratio of the mass of the rocket filled with fuel to the mass of rocket without fuel \r
\n" ); document.write( "\n" ); document.write( "Find the velocity of a space craft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.7 Km/s, and a firing time of 30s. Can the space craft achieve a stable orbit 300km above earth \n" ); document.write( "
Algebra.Com's Answer #442009 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
Use v = - 0.0098t + c ln R, where v is the velocity of the rocket,
\n" ); document.write( " t is firing time and
\n" ); document.write( " c is velocity of exhaust
\n" ); document.write( " R is ratio of the mass of the rocket filled with fuel to the mass of rocket without fuel
\n" ); document.write( ":
\n" ); document.write( "Find the velocity of a space craft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.7 Km/s, and a firing time of 30s. Can the space craft achieve a stable orbit 300km above earth
\n" ); document.write( ":
\n" ); document.write( "v = -.0098(30) + 2.7*ln(20)
\n" ); document.write( "v = -.294 + 2.7(2.9957)
\n" ); document.write( "V = -.294 + 8.099477
\n" ); document.write( "v = 7.794477 km/sec
\n" ); document.write( ":
\n" ); document.write( "I think the escape velocity from earth is about 11 km/sec so don't think it will make it. \n" ); document.write( "
\n" );