Describe how a simple electric cell works
What will be an ideal response?
The simplest cells contain two plates or rods made of dissimilar metals called electrodes. The electrodes are immersed in a solution, such as dilute acid, called the electrolyte. The part of each electrode outside of the solution is called the terminal, and connections to wires and circuits are made here. The acid tends to dissolve one of the electrodes, leaving it with a negative charge. As the electrolyte becomes positively charged, electrons are pulled off the other electrode by the electrolyte. Thus this electrode becomes positively charged. Because there is an opposite charge on the two electrodes, there is a potential difference between the two terminals.
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Mercury's most unusual orbital feature, as compared to the other planets, is:
A) the size of its orbit. B) the shape of its orbit. C) its orbital period. D) the size of the planet. E) that it has no moons.
What holds galaxy clusters together?
A. the strong force B. the cosmological constant force C. the electromagnetic force D. gravity E. the pressure from the cosmic background radiation
Why are smaller terrestrial bodies such as Mercury or the Moon “geologically dead”?
a. They cooled off faster than Earth did. b. They don’t have erosion. c. They were hit by fewer meteorites than Earth. d. They are made of different materials than Earth.
A 5-N block of wood is difficult to fully submerge in a pool of mercury because the buoyant force on the block when submerged is
A) less than 5 N. B) 5 N. C) much more than 5 N.