How many protons are in an element with an atomic number of 8 and a mass number of 18?

Why does sandpaper get hot when it is rubbed against rusty metal?

What is the role of the mid ocean ridge in the movement of lithosphere?

What is a ramp? A. Inclined plane B. Wheel and axle C. Pulley D. Axle

What is the mass of a 14.6 cm3 cube of mercury (density 13.6 g/cm3) ?

According to the Milgram experiments, which of the following factors makes an individual more likely to conform to a request that would harm an innocent victim? A. absence of a direct authority figure B. authority figure is seen as legitimate C.

Which of the following is NOT a strategy to prevent falls? a. keeping walking surfaces free from moisture and clutter b. replacing damaged electrical cords c. installing handrails for stairs d. keeping a ladder handy for reaching high places

What are a few things that could not be used as evidence?

Examples were friction is not useful

How do the following factors affect the resistance of a wire? a. Temperature b. Length c. Diameter

The metric system is based on units of A: twenty five B fives C: sixteen D: tens