A geologist is comparing the properties of different minerals. He rubs each one on a piece of white tile and observes the color of he power that is left behind. What type of test did he perform?

color

hardness

luster

streak

How do electrons behave in a good insulator?

A juggler throws a bowling pin straight up in the air. After the pin leaves his hand and while it is in the air, which statement is true? (a) The velocity of the pin is always in the same direction as its acceleration.

Barometer is taken from the base to the top of a 279-m tower. assuming the density of air is 1.29 kg/m3, what is the measured change in pressure?

What statement is true about the magnetic force

An atom that has an excess positive or negative electrical charge caused by the loss or addition of an electron is called a (n)

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.

What two factors determine how fast weathering occurs

A sound that's produced by a single wave at a constant frequency and with no overtones is called

Which of the following is ignored when determining the relative mass of atoms? protons nucleus electrons. neutrons