A projectile is shot horizontally ( x direction) from the edge of a vertical cliff 100 m above level ground. Its initial speed is 75 m/s. Neglecting air resistance. At what angle is the velocity vector measured clockwise from the x axis the instant before it hits the ground

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.