How can different type of matter be distinguished from each other

Which type of heat transfer is described when energy is transferred by waves of heat or light striking the food?

A Cyclist road at an average speed of 15 miles per hour for 30 miles how long was the ride

A spring is compressed between two objects with unequal masses, m and M, ad held together. The objects are initially at rest on a horizontal frictionless surface. When released, which of the following is true?

As frequency increases the wavelength increases or decreases

The scientific method is one application of critical thinking.

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.