Figure shows a ray of light as it travels from medium a to medium b. the refractive index of medium b relative to medium a is ?

Awheel rotates without friction about a stationary horizontal axis at the center of the wheel. a constant tangential force equal to 82.0 n is applied to the rim of the wheel. the wheel has radius 0.150 m . starting from rest, the wheel has an angular speed of 12.8 rev/s after 3.88 s. what is the moment of inertia of the wheel?

What determines the amount of inertia an object has

If element x has 99 protons how many electrons does it have