Sound in air can best be described as which type of wave?

An atom of sodium has a larger mass than an atom of neon. How is this possible when neon has so many more valence electrons? What particles make up most of the mass of an atom? What takes up most of the volume of an atom?

How do natural gas and crude oil compare as energy resources?

Determine the period of a 1.7-m-long pendulum on the Moon, where the free-fall acceleration is 1.624 m/s2. Express your answer with the appropriate units.

What is the average velocity of the person taking this walk?

A hydraulic system for a dentist's chair is designed to be able to lift 3,112 newtons. the surface area over which this force is applied is 707 cm2. what force must be applied to the activator end of the system if the button has a surface area of 3.

Objects can be accelerating and traveling at constant velocity at the same time. True or False

What kind of star gives rise to a type i supernova? a. white dwarf stars b. massive main sequence stars c. red giant stars?

Example of an object in motion

A proton and an alpha particle are momentarily at rest at a distance r from each other. They then begin to move apart. Find the speed of the proton by the time the distance between the proton and the alpha particle doubles.

Why is it a good idea to extend your bare hand forward when you are getting ready to catch a fast-moving baseball? a. So you can catch the ball with a stiff arm, increasing the time to slow the ball thus deceasing the force. b.