Why are radio waves considered harmless while ultraviolet waves and x-rats considered harmful

A substance through which a wave can travel

Friction between solids can be most accurately defined as the force that opposes the sliding motion of two surfaces that are touching each other. True or false

You are trying to determine the area of the floor of a rectangular closet since you will be replacing the carpet. You measure the length to be (5.0±0.1) m and the width to be (3.8±0.1) m.

Which of the following formulas represents an olefin (aka alkaline) c2h4o c2h5oh c2h6 c2h4

In which case is work being done? A. When an object has an initial velocity of zero B. When an object moves during a certain amount of time C. When a force is exerted on an object D. When a force makes an object move over a distance

Anna bought a tangle fish and two rainbow fish for her aquarium the rainbow fish cost $6 more than the angelfish if she paid a total of $37 what is the cost of the angel fish

Suppose that the entire Universe began to contract (collapse) right now. Five billion years from now, an astronomer looking at the spectra of galaxies. What would be the changes noted? A.

Which of the following statements about the atom is false?

Explain why models are often used to study other planets.

The main factors that affect an area's temperature are prevailing winds and mountains. a. True b. False