This exercise we work with the conservation of the moment, the system is made up of the merry-go-round and the child, for which we write the moment of two instants

Initial

L₀ = I₀ w₀

Final

$L_{f}$ = I w

L₀ = L_{f}

I₀ w₀ = I_{f} w

.w = I₀/I_{f} w₀

The initial moment of inertia is

I₀ = 500 kg. m2

The final moment of inertia

$I_{f}$ = 500 + m r²

I_{f} = 500 + 20 1.5

I_{f} = 530 kg m²

Initial angular velocity

w₀ = 0.20 rad / s

Let's calculate

w = 500/530 0.20

w = 0.189 rad / s

6 0

2 years ago

Define upthrust simply (don't copy)

EleoNora [17]

Upthrust is the force that is pushing you up. Kinda to stop you from sinking right into the Earth. Upthrust is simply any force that is causing something to be pushed upwards. Kinda like the opposite of gravity, which is pulling you down =]

Hope this helps ❤️

3 0

2 years ago

A 800N student does a handstand with both hands at an angle of 15 degrees from the vertical what is the force on each hand

jeyben [28]

here we can say that net force on the student vertically upwards will be counter balance by his weight downwards

Let net force F is exerted by each hand

so here we will have

$2Fcos15 = W$