Select the correct answer.

A car moves with an average speed of 45 miles/hour. How long does the car take to travel 90 miles?

А.

2 minutes

OB.

2 hours

OC.

45 minutes

OD

45 hours

E

90 minutes

5. The change in isotopes over time due to the emission of radioactive particles is known as A. absolute-age dating. B. half-life. C. radiometric dating. D. radioactive decay.

Why do elements in the same group or column of the periodic table have similar properties? A. They have the same number of protons. B. They have the same number of neutrons. C. They have the same number of outer shell electrons. D.

What similarities do heat and temperature have in common?

Two spaceships are each traveling in a straight line at 0.95c. The first ship is moving directly toward the Sun. The second ship is moving directly away from the Sun. Observers on each ship measure the velocity of light coming from the Sun.

The weight of a body in earth is 29N. Find the mass?

Positively-charged particles consisting of two protons and two neutrons emitted by radioactive materials. True or False

A package of aluminum foil is 59.3 yd long, 13 in. wide, and 0.00040 in. thick. If aluminum has a density of 2.70 g/cm3, what is the mass, in grams, of the foil?

A teacher pushed a 10-kg desk across a floor for a distance of 5 m she exerted a horizontal force of 20 N how much work is done

Carbon and oxygen, both nonmetals, bond to form a compound. What is the name of the carbon compound with one carbon and two oxygens? A) carbon oxide B) carbon dioxide C) carbon dioxygen D) monocarbon dioxide

Salt water has greater density than fresh water. A boat floats in both fresh water and in salt 12) water. Where is the buoyant force greater on the boat?