Author Question: Which of the following cases in the Drake equation would be the minimum necessary condition for us ... (Read 28 times)

MGLQZ · **on:** Jul 27, 2018

Which of the following cases in the Drake equation would be the minimum necessary condition for us to be the only intelligent civilization currently in our galaxy?

A) any two of the factors to be zero
B) any three of the factors to be zero
C) all of the factors to be zero
D) any one of the factors to be zero

Question 2

A roller coaster car (mass = M) is on a track that forms a circular loop (radius = r) in the vertical plane. If the car is to just maintain contact with the track at the top of the loop, what is the minimum value for its speed at that point?

A) Mrg
B) 2 Mrg
C)
D)
E) /