What did Heraclitus mean when he said, “You never see the same river twice”? A. Individual perception is always changing.
B. Water is in all solids found in the universe.
C. Once something is seen, it cannot be unseen.
D. A river will change from one time you see it to the next.

The man fires an 80 g arrow so that it is moving at 80 m/s when it hits and embeds in a 8.0 kg block resting on ice. how far will the block slide on the ice before stopping? a 7.1 n friction force opposes its motion.

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

What is the major limitation to the light microscope?