potential/ kenitic energy problem (1 Viewer)

[clicker]

How much work is done to increase the angular velocity of a wheel from rest to a final value of 20 radians per second.The wheel has a moment of inertia of 0.30 kg m2 .What torque is required to reach this angular velocity in a time of 5.0 s?

 

[Xayma]

clicker, may I ask, what state are you from exactly?

None of your questions are HSC Physics questions.

 

[KFunk]

I suspect Victoria. But let him post, they're interesting and HSC physics students could use this type of thinking.

 

[Xayma]

His IP address indicates it is sydney based.

I'm guessing he is a university student. It seems familiar to what we are doing at this point in time.

 

[clicker]

i am originally from victoria but im staying for a while in sydney currently in yr 12 and im doin distant education

 

[jumb]

How much work is done to increase the angular velocity of a wheel from rest to a final value of 20 radians per second.The wheel has a moment of inertia of 0.30 kg m2 .What torque is required to reach this angular velocity in a time of 5.0 s?

This is all vector stuff. I'm guessing you'd need to merge a few equations.

Someone tell us all of the equations, such as Angluar work, angular velocity and torque.

 

[clicker]

angular velocity = tangential speed/ radius

moment of inertia = mass * (radius)squared

work = force * distance

 

[clicker]

torque = force * distance

 

[Xayma]

Your formula for moment of inertia is wrong.

It's typically of the form

I=kMR²
nor just MR²

τ=Iα

So α=(ω_f-ω_i)t
=20/5
=4 rad/s²

τ=0.3*4
=1.2 Nm