Which of the following statements is true? A. All metals are magnetic. B. All the magnets are made of iron. C. Earth is a giant magnet.

What are the reactant (s) and product (s) of this reaction? Write down the equation, in words, for the formation of rust.

The force between two magnetic poles will increase as their separation is increased. true or false?

When a warm air mass catches up with a cold air mass, forming a warm front, the warm air slides over the top of the cold air, before pushing it away. can be expected as the warm air rises over the cold air and moisture in the warm air condenses?

The rock cycle indicates that each type of rock: a.) can provide materials to make other rocks b.) can form other rocks c.) can be changed by natural processes d.) all of the above

At ground level g is 9.8m/s^2. Suppose the earth started to increase its angular velocity. How long would a day be when people on the equator were just 'thrown off'? Why is the expression 'thrown off' a bad one?

A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s. As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s.

The power rating of a vacuum cleaner is 0.8 kilowatts. If you use the vacuum cleaner for 2.5 hours, how much energy does it use?

Which has more gravitational potential energy - - a cliff diver at the top of the cliff or a cliff diver at the bottom of the cliff?

A skydiver with a mass of 60 kg jumps from an airplane. Five seconds after jumping the force of air resistance is 300 N. What is the acceleration of the sky diver, five seconds after jumping?

How many basic wave forms are there? A.) 1 B.) 2 C.) 3 D.) 4