A light ray enters a piece of transparent plastic with a thickness of 50 m and a refractive index of 1.2. What is the time taken by the ray to propagate through the plastic if the velocity of light in air is 3 x 10^8 ms^-1? The options for the answer are 2.5 x 10^-8 s / 2.0 x 10^-8 s / 1.5 x 10^-7 s / 2.0 x 10^-7 s

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

You are given two vectors a⃗ =−3.00ι^ 5.00j^ and b⃗ =5.00ι^ 2.00j^. let the counterclockwise angles be positive.

Aplane flying horizontally at an altitude of 1 mile and a speed of of 500mih passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it is 2mi away from the station.