Which is true of a mechanical wave?

A) It must have a medium.

B) It must travel in empty space.

C) Both sound and light are examples.

D) It can travel in a vacuum.

How do organisms interact with each other?

You swing one yo-yo around your head in a horizontal circle. then you swing another yo-yo with twice the mass of the first one, but you don't change the length of the string or the period. how do the tensions in the strings differ?

The forces exerted by earth and a skier become an action reaction force pair when the skier accelerates while earth doesnt seem to move at all. expalin why the skier accelerates whu, e tthe earth doesn't seem to move at all?

What is the process by which heat transfers from one particle of matter to another when the particles collide?

According to this lesson, how many major ice ages has the earth undergone? A. 2 B. 3 C. 4 D. 5

What is a planetary nebula? a. leftover gas from a supernova explosion b. the ejected envelope of a giant star surrounding the remnant of a star c. a type of young, medium-mass star d. a planet surrounded by a glowing shell of gas e.

A train is moving 4.82 m/s when it begins to accelerate. After 24.8s it is moving 7.09m/s how far did it move in that time

List three different emotions?

The jet stream flows from east to west across the United States. True False

You are in a hot air balloon, 350 m above the flat Texas plains. You look out toward the horizon. How far out can you see--that is, how far is your horizon? The Earth's radius is about 6400 km.