What does it mean to control variables

You are hungry and decide to go to your favorite neighborhood fast-food restaurant. You leave your apartment and take the elevator 10 flights down (each flight is 3.0 m) and then go 15 m south to the apartment exit. You then proceed 0.

A 0.1 kg magnet is floating above a second magnet. The magnetic force on the 0.1 kg magnet is

Why do sound waves do not travel in empty space? a. because sound waves do not need matter to travel. b. because sound waves need matter to travel. c. because sound waves need vacuum to travel. d. none of the above

Bill and Tom are both towing wagons. Bill's wagon weighs 10 pounds, and Tom's wagon weighs 20 pounds. Bill is pulling his wagon with twice the force that Tom is. How do the wagon speeds compare?

Why is a train more difficult to stop than a rolling ball, even if they are traveling at the same speed?

Which of these changes does a submarine encounter as it returns from the bottom of the ocean to the surface of the ocean? a. the amount of sunlight increases. b. the water temperature decreases. c. the amount of plants decreases. d.

Why do some elements have symbols that don't use letters in the element's name?

How many (whole number of) 91 kg people can safely occupy an elevator that can hold a maximum mass of exactly 1 metric ton? A metric ton is 1.000 * 103 kg. Answer in units of people.

What are the two types of surface waves? How are they different and which one would cause more damage? Explain.

What causes a regular reflection?