Briefly describe how thunder and lightning develop
What will be an ideal response?
Answer: Lightning and thunder often accompany thunderstorms. As water droplets in the thundercloud bump into and rub against one another, the cloud becomes electrically charged—usually positively charged at the top and negatively charged at the base. As electrical stress between the oppositely charged regions builds up, the charge becomes great enough that electrical energy is released and passed to other points of opposite charge, which quite often means the ground. The electrical energy flow from cloud to ground is lightning. As lightning heats up the air, the air expands and we hear lightning's noisy companion, thunder.
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Center of Mass: There must be equal amounts of mass on both sides of the center of mass (or center of gravity) of a system.
A. True B. False
If an astronaut landed on a planet composed of antimatter, there would be an explosion and the
A) planet would annihilate. B) astronaut would annihilate. C) astronaut and an equal amount of planet antimatter would both annihilate.
During an isobaric process which one of the following does not change?
a. volume c. internal energy b. temperature d. pressure
If the number of turns on the secondary coil of a transformer are less than those on the primary, the result is a
A) step-down transformer. B) step-up transformer. C) 120-V transformer. D) 220-V transformer. E) a dc transformer.