Why is 21-cm radiation so important to the study of interstellar matter and the galaxy

Because its the most suitable radiation for that use

Explanation:

Astronomers use the 21 cm radiation for interstellar and cosmological research as this type of radiation is best suitable for the purpose its intended for. It can easily go through gas and dust molecules and other interstellar bodies that causes a blur vision of the content of space.

u=13

v=30

s/t=u+1\2at

=13+431/2

=13+265.5

=278.5

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.