The burj khalifa, a building in dubai, united arab emirates, is about 828 meters tall. brody is making a scale model of this building, using the scale 500 meters : 1 meter. to the nearest tenth, how tall should brody's model of the burj khalifa be? enter your answer as a decimal in the box. 0.60 m

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?