It’s possible to determine the composition of the ancient atmosphere by analyzing bubbles of air trapped in am- ber, fossilized tree resin. (This is one way that we know that the air in the time of the dinosaurs was richer in oxygen than our current atmosphere.) An air appears to be 7.2 mm below the surface of a piece of amber, with index of refraction 1.54. How long a needle is required to reach the bubble?

Which of the following correctly describes the early view of catastrophism?

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

Which body is in equilibrium? (1) a satellite orbiting earth in a circular orbit (2) a ball falling freely toward the surface of earth (3) a car moving with a constant speed along a straight, level road (4) a projectile at the highest point in its trajectory