# Tag Info

Accepted

### Toilet paper dilemma

I'll propose a theory, and I'll describe an experiment I did to test it. Both suggest that the "over" configuration is better, at least if the goal is to make the squares easier to rip off ...
• 54.7k
Accepted

• 50.8k

### How many types of inertia are there?

My suggestion is you throw this book away, and use only "good books". Whoever wrote this book has a very confused mind. I can vaguely guess what the author might have had in mind when he ...
• 4,428
Accepted

### Does a rotating rod have both translational and rotational kinetic energy?

It depends what you consider to be the "pivot" about which the rotational kinetic energy is calculated here: If you choose the pivot as the end of the rod that is physically held in place, ...
• 934
Accepted

### Can the direction of angular momentum and angular velocity differ?

Consider a thin rectangular block with width $w$, height $h$ resting along the xy plane as shown below. The mass of the block is $m$. The mass moment of inertia (tensor) of the block about point A ...
• 38.9k

### Why doesn't this way of calculating the moment of inertia of a sphere work?

The moment of inertia is defined relative to an axis, not a point. Therefore the distance you need is from a mass element in the sphere to the $z$-axis, not to the origin. This is why the disk method ...
• 52.5k
Accepted

• 55.3k
Accepted

### How can a flywheel make engine run smoothly?

By adding flywheel makes engine to take more power to spin the flywheel because of its huge mass. Efficiency of the engine drops very low. I can only see more burden than smoothness. The burden is ...
• 76k