People with bad eyesight use glasses made of high index glass. If a ray in air strikes the glasses at 31.2 deg, and enters the glass at 17.6 deg, what is the index of refraction of the glass?

Picture a all traveling at a constant speed around the inside of a circular structure. is the ball accelerating? explain your answer

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Ineed the answer to question 1 , i’m desperate