When iron is exposed to oxygen it rusts or oxidizes. Which of these represents the balanced equation for this chemical change?

A) Fe + O → FeO

B) FeO → Fe + O

C) Fe + O2 → Fe2O3

D) 4Fe + 3O2 → 2Fe2O3

If a lava flow at earth's surface has a basaltic composition what rock type would the flow likely be?

How is velocity different from speed?

The chart lists the masses of four balls that have the same momentum. Which correctly compares two of the balls? Answer The red ball has a greater velocity than the purple ball.

A perfectly elastic collision is a collision: Between two springs. That conserves thermal energy. That conserves kinetic energy. That conserves potential energy. That conserves mechanical energy.

Consider the waves on a vibrating guitar string and the sound waves the guitar produces in the surrounding air. The string waves and the sound waves must have the same velocity. wavelength. frequency. amplitude. More than one of the above is true.

A geologist estimates that a large boulder weighs 7840 N. What should he estimate the mass of this boulder to be? A. 650 kg B. 740 kg C. 780 kg D. 800 kg

Two objects have the same momentum. Do the velocities of these objects necessarily have (a) the same directions and (b) the same magnitudes? Give your reasoning in each case.

If you keep voltage constant and increase resistance resistance, what happens to current?

A scene in a movie has a stuntman falling through a floor onto a bed in the room below. The plan is to have the actor fall on his back, but a researcher has been hired to investigate the safety of this stunt.

During energy transformation, all energy systems: are a. 100 percent efficient b. lose energy c. gain heat energy d. create energy