Asandcastle in the shape of a truncated cone. calculate the diameter of the base.

the diamètre of the top is 20cm, the slope length is 32cm and the height is 30cm.

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a​ rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r​, where t is the firing time in​ seconds, c is the velocity of the exhaust in kilometers per​ second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20​, an exhaust velocity of 2.1 ​km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above​ earth?