Light travels slowest in high density media, faster in lower density media, and fastest in low density media. Which wave behavior is observed when light passes through media of different densities?
A
diffraction
B
reflection
C
refraction
D
interference

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue

Suppose you plot the distance traveled by an object at various times and you discover that the graph is not a straight line. what does this indicate about the object's acceleration?

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.