It's nighttime, and you've dropped your goggles into a 3.0-m m -deep swimming pool. If you hold a laser pointer 0.90 m m above the edge of the pool, you can illuminate the goggles if the laser beam enters the water 2.0 m m from the edge.

Using a pedometer, you walk 3000 steps in 20 minutes, so your speed is 150 steps/min. each of your steps is 0.7 m long. what is your speed? 150 steps/min=/s=/h

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

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.