Select all the correct answers. Which vectors are unit vectors? U=(-1/3 sqrt(7/2),1/3sqrt(13/2))
U=(1/sqrt(3),-sqrt(2/3))
U=(1/2sqrt(5/3),-1/2sqrt(7/3))
U=(3/sqrt(7),-2/sqrt(7))
See attachment

What is the missing statement in step 4? ? rts ? ? vtu and ? rtu ? ? vts ? rts ? ? rvs and ? rtu ? ? stv ? vrs ? ? vru and ? usr ? ? usv ? vur ? ? vus and ? uvs ? ? sru

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?

The collection of beautiful oil paintings currently on display at an art gallery well defined; set not well defined; not a set