42. a dam is built on a river. as water passe...
42. a dam is built on a river. as water passes through the dam, it causes a coil of wire to turn between the poles of a permanent magnet. when the wire coil turns, a current is produced in the wire. which of these best describes the dam? (a) battery (b) generator (c) electric motor (d) electromagnet 43. the diagram is a representation of the periodic table. the letters a through d represent the locations of four elements on the table. which letter represents the location of the element that has an atomic number of 12? (a) a (b) b (c) c (d) d
Answer
# Brief Explanations:
## Question 42:
A generator converts mechanical energy (from the water - turned coil) into electrical energy (the current in the wire). A battery stores chemical energy and converts it to electrical energy, an electric motor converts electrical energy to mechanical energy, and an electromagnet is a magnet that runs on electricity. So the dam in this context is a generator.
## Question 43:
The current periodic table has elements up to atomic number 118. Elements with higher atomic numbers are expected to be placed in the lower - right regions of the extended periodic table. Region D represents the area where superheavy elements (elements with high atomic numbers) would be placed if they were discovered.
# Answer:
42. b. generator
43. d. D