Calculate the work done by the system where a chemical reaction takes place in a container of cross-sectional area 50. 0 cm. As a result of the reaction, a piston is pushed out through 15 cm against an external pressure of 121 kpa.

Did the universe cool off or get hotter as it expanded after the 'big bang"?

Scientists observed a rock stratum and discovered some fossils. the image shows the fossils they discovered. what can you interpret from the image? an illustration showing layers rock with fossils embedded in some rock layers1. the dinosaur and the mammoth existed after the trilobites.2. the dinosaur and the armored fish existed before the trilobites.3. the trilobites and the armored fish died before the dinosaur.4. the trilobites and the armored fish were born after the dinosaur.5. the early mammoth is older than the trilobites.

Which of the following is true of concerts a. concepts prevent us from generalize b. concepts independent of experiences and object. c. concepts complicate the memory process d. concepts provide clues about how to react to a particular object or experience