Name the part of the human eye which acts as a protective layer for the eye

Atransverse wave is traveling on a string stretched along the horizontal x-axis. the equation for the vertical displacement y of the string is given by y = (1.8 x 10-3)cos[π(13x - 60t)], where all quantities are in si units. what is the maximum speed of a particle of the string

In physics the desire of an object to keep doing what it is doing is termed?

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?