Answer:
(a) 0.426 rad/s
(b) Before 296.225 J and After 148.5 J
Explanation:
At the center of merry-go-round, the person's weight is 75 Kg with moment of inertia of 820 kgm2 and the initial angular velocity is 0.85 rad/s
At the edge, the new angular velocity gained depends on the new moment of inertia
Here, the final moment of inertia is given by Initial moment of inertia + 
where M is the mass and R is the radius of merry-go-round
Final moment of inertia=
From the law of conservation of angular momentum as torque is zero
and making 
the subject then
where 
and 
are initial and final moment of inertia, 
and are initial and final angular velocity.
Substituting the provided values
(b)
Initial rotational kinetic energy is given by
The final rotational kinetic energy is given by
An organism naturally adapts to it's environment. Organisms have to adapt to survive to live in a certain environment. Their outside appearance and physical features depends on how they get their food, how they protect themselves from predators, and how they keep their body warm or cold in that climate. This kind of goes with the idea of natural selection. Natural selection is when animals adapt to changes over time by reproducing and creating genetic variations in their offspring. For example, if there are two types of rabbits. One rabbit is black and the other is white. These rabbits live in a very cold place where there is a lot of snow. The predators have been eating most of the black rabbits since, they are easily seen. The white rabbits will keep on reproducing, while the black rabbits population will decrease. After a while the black rabbits will be no more and a new generation of white rabbits will be able to survive and thrive.
2 disadvantages would be damage to Marine life and hydroelectric plants are very expensive.If they plant is not stable and breaks it can cause flash floods and property damage.2 advantages would be that they do not emit any carbon emmissions.Some cities cannot build hydroelectric power plants because the stream does not have that kind of pressure .so really it matters greatly on where the dam would be placed. but sunny places like arizonasolar plant would be great
I hope this help
240 = 0+1/2 (-9.8t
240 = -4.9t
<span>240/-4.9 = t</span><span>
</span>49.0 = t
t= 7.0s
Weight = m times g = 5.23 times 8.83 = 46.18 N
