14. The diagram shows the shadows cast by a tall building at two different times of day. In the diagram, BDrepresents th
tall building, and AD and CD represent the shadows.
*
You need to find -
B
?
20°
250 m
"
D 100 m C
BD and Ā B (find first)
(find second)
IfmZBAD = 20°, AD = 250 meters, and CD = 100 meters, find the approximate lengths of BD and AB, and
the approximate measure of ZBCD. Choose all that are correct. (3)
OmZBCD 42.3
OmZBCD – 58.8°

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?