The force of ___ always turns mechanical energy into thermal energy

At 25°C, sound can travel 100 meters across a football field in 0.29 seconds. Determine the velocity of these sound waves in the direction they travel across the field. A) 0.0029 m s B) 29 m s C) 345 m s D) 34,500 m s

An ocean wave has a wavelength of 2 meters and a period of 5 seconds. What is the speed of the wave?

In which of the following situations is an object not accelerating? A. An airplane changes course at a constant speed. B. A water-skier gains speed in a straight line as she stands up. C. A man walks in a straight line without changing his speed. D.

Newton's Second Law says that force is equal to mass times acceleration. If the car and washer were more massive, you would need (more / less) force to accelerate car and washer equally. (5 pts)

How can you tell one element from another?

Ian walks 2 km to his best friend's house, then walks 0.5 km to the library. He then makes a 2.5 km walk home. The entire walk took him 3 hours. What is his average speed in km/h? SHOW YOUR WORK!

What would happen if earth gravity suddenly disappeared?

How many layers of material were the roads made of? a. two c. four b. three d. five

Red light has a shorter wavelength than yellow light.

Approximately what is the parallax angle of a star that is 20 light-years away?