An oil layer that is 5.0 cm thick is spread smoothly and evenly over the surface of water on a windless day. what is the angle of refraction in the water for a ray of light that has an angle of incidence of 45° as it enters the oil from the air above? (the index of refraction for the oil is 1.15, and for water it is 1.33.)

Which changes of state do the labels represent? a: b: c:

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?