Which statement explains the type of friction acting on each object?

the bike has rolling friction, the sled and the motorcycle have sliding friction, and the elephant has static friction.

the bike and sled have sliding friction, and the motorcycle and elephant have static friction.
the bike has static friction, the sled and elephant have sliding friction, and the motorcycle has rolling friction.

the bike and motorcycle have rolling friction, the sled has static friction, and the elephant has sliding friction.

If many scientists conduct the same or similar experiments, and all obtain similar results, a can be written, which is a generally agreed-upon statement that explains and predicts how a natural phenomenon works.

Steam reforming of methane ( ch4) produces "synthesis gas," a mixture of carbon monoxide gas and hydrogen gas, which is the starting point for many important industrial chemical syntheses. an industrial chemist studying this reaction fills a 1.5 l flask with 3.5 atm of methane gas and 1.3 atm of water vapor at 43.0°c. he then raises the temperature, and when the mixture has come to equilibrium measures the partial pressure of carbon monoxide gas to be 1 .0 atm. calculate the pressure equilibrium constant for the steam reforming of methane at the final temperature of the mixture. round your answer to 2 significant digits.

What happens to the concentration of hydronium ions as the ph of a solution increases? a. hydronium ion concentration stays the same b. hydronium ion concentration decreases c. hydronium ion concentration increases