How many stars are on the us flag?

The 6.50-cm-long second hand on a watch rotates smoothly. What is its angular velocity? What is the speed of the tip of the hand?

In electrical work, silver is used as a (n)

What is an example of a chemical change that occurs as part of the rock cycle A) lava cools and condenses on the Earths surface B) sedimentary rocks are worn away by water erosion C) igneous rocks are cracked and broken into smaller pieces by

Which of the following is the best definition of refraction? A. reversal in the direction of a wave B. loss of energy from a wave C. change in wave direction due to a change in wave speed D. blocking of a wave by a sharp boundary

Choose all of the following that are examples of electromagnetic radiation. Sound waves, Microwaves, All of these, "The Force", Infared Waves, Water waves, Visible light, None of these

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

A car accelerates uniformly from 0 to 15m/s in 5 s. Calculate acceleration.

Which device would a sleep researcher use to monitor a sleeping person's brain waves?

An experiment is performed to obtain the value of a physical property. If the true (i. e., correct) value of the property is 50 and the measured (i. e., experimental) value is 32, the percent error of the experimental result is:

White moths were found in huge numbers in the city of Birmingham. These moths could be easily camouflaged by the trees. Because of sudden industrial development, the trees in the city were covered with soot.