Two ponies of equal mass are initially at diametrically opposite points on the rim of a large horizontal turntable that is turning freely on a vertical, frictionless axle through its center. the ponies simultaneously start walking toward each other across the turntable. as they walk, what happens to the angular speed of the turntable? (a) it increases(b) it decreases(c) it stays constantconsider the ponies-turntable system in this process is the angular momentum of the system conserved? (a) yes(b) no

A

Explanation:

Given

Two ponies are at Extreme end of turntable with mass m

suppose turntable is moving with angular velocity

Moment of inertia of Turntable and two ponies

let say at any time t they are at a distance of r from center such

Moment of inertia at that instant

conserving angular momentum as net Torque is zero

Thus we can say that angular velocity increases as they move towards each other.        

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.