X and Y
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Answer:
7 rpm = 0.73 rad/s
Step-by-step explanation:
R = Radius of merry-go-round = 1.8 m
= Moment of inertia of merry-go-round = 255 kg m²
= Moment of inertia of child
ω = 9 rev/min
m = Mass of child = 24 kg
From the conservation of angular momentum

∴ New angular speed of the merry-go-round is 7 rpm = 
The answer is the first one! :)
Answer:
3 : 1
Step-by-step explanation:
Gold : tetra
21 : 7
3 : 1
Question is basically asking you do break down 66 to it's factors
11 x 6=66
11 is a prime number it can't be broken down
6 can be broken down to 3 x 2
therefore our answer is:
3 x 2 x 11