Name three devices or inventions which are designed to increase friction.

A lightbulb converts 10 percent of the electric energy it uses into radiant energy

According to the chart, which region of the country would be considered the most heavily religious? A) Midwest B) Northeast C) South D) West

How much work do you do when you lift a 15-kg box to a height of 5.0 m? 75 J 735 J 980 J 735 lb 147 N

What region of the electromagnetic spectrum contains wavelengths the size of an atom? (10^-10 meters) What frequency does this wavelength correspond to?

The pitch that the average human can hear has a frequency of 20.0. If sound with this frequency travels through air with the speed of 331 m/s, what is its wavelength.

A 111.6 g sample of iron was heated from 0°C to 20°C. It absorbed 1004 J of energy. What is the specific heat capacity of iron?

A car is driving towards a brick wall at a constant velocity (don't try this at home!) and the driver honks the horn of the car. the sound of the horn reflects from the wall and the echo is heard by the driver.

Mass number of an atom with 11 protons

Which of the following elements is the most reactive? Beryllium Calcium Magnesium Barium

A flash of white light containing all the colors of the visible spectrum in air shines straight down on the surface of a pool.