Which set of dimensions is possible for a rectangular prism with volume 420 cm3? a. 4 cm by 8 cm by 12 cm b. 4 cm by 10 cm by 12 cm c. 5 cm by 7 cm by 12 cm d. 5 cm by 8 cm by 12 cm

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?