An oceanic depth-sounding vessel (sonar) surveys the ocean bottom with ultrasonic sound that travels at an average of 1522m/s. how deep is the water if the time delay of the echo from the ocean floor is 2.0s?

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?