Answer:
B
Explanation:
Because , it is the answer .
No one is 100% sure when particles of matter originated however scientist believe it had to be some time before the Big Bang
The first one is the answer
isotopes of an atom have different number of neutrons . the number of protons are not different in isotopes of an atom
Answer:
v = 16.49 m/s
Explanation:
Given that,
Length of the string, l = 1.15 m
The ball makes 137 complete turns each minute.
We know that, 1 turn = 6.28 rad
137 turns = 860.79 rad
1 min = 60 s

We need to find the tangential velocity of the ball. It can be given by

So, the tangential velocity of the ball is 16.49 m/s.
Hi :) If your answers choices are what I'm thinking, the answer is two :)