Which type of wave requires a material medium

through which to travel?

(1) sound (3) television

(2) radio (4) x ray

Suppose that on a routine trip around the galaxy, your dog puts his head out of the spacecraft window (as dogs often do). The solar wind has a temperature of approximately 104 K.

A 200-kilogram wood crate is pushed across a wood floor How much force will be needed to move the box at a constant velocity of 0.5 m/s

List of priceless your bodies from largest to smallest in terms of their distance from earth

What is the kinetic energy of a 10kg object moving at 2.0m/s?

An element's atomic number is 35. how many portions would an atom this element have

Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip. Which best describes Kai's roundtrip?

The engine that powers a crane burns fuel at a temperature of 1500 oC. It is cooled by air at a temperature of 20 oC. The crane is used to lift a 1000 kg steel girder 30 m into the air.

The portion of a light ray that falls on a surface is a/an

Give the definition for diffusion. (A) gas molecules mix unequally average distance between collisions (B) gas molecules escape from a container into a vacuum through a small hole (C) gas molecules mix equally (D) gas molecules spread out in a

As resistance goes up, what happens to the current?