90km/4hrs=22.5kn/hr average speed. Her dispacement is 0. Her trip started and ended in the same place.
It is very large in size, I don’t have an exact number but i believe it is over the 1,000s.
There is 1 Mg and 2 Cl i think
Endothermic: ice melting into water, and an instant ice pack turning cold
Exothermic: fireworks exploding, and gasoline burning
Answer:
L = L0 ( 1 - v^2/c^2))1/2 where L0 is the proper length
L = 10 L-y (1 - .9^2)^1/2 = 4.36 L-y length of pole measured by ship
t = 4.36 L-y / .9 c = 4.84 y since the ship travels at .9 c