Explain the changes in acceleration for an object falling in air as it gains speed
What will be an ideal response?
A falling object experiences the least air drag when its velocity is least, at the beginning of the fall when it is hardly moving. At this point the acceleration is 10 m/s2. As the object gains speed, air drag builds up, which diminishes the net force on the object. This in turn diminishes acceleration. As speed increases, air drag increases, net force decreases, and acceleration decreases. If air drag builds up to equal weight, acceleration decreases to zero and the object reaches its maximum speed. This is called its terminal speed.
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The International Space Station it is mainly above Earth's
A. gravitation. B. atmosphere. C. both of these D. none of the above
The areas in South Asia that are likely to be most adversely affected by global climate change and rising sea levels are
A. the coastal port cities. B. any city on water body. C. Maldives and the Delta of the Ganges-Brahmaputra Delta. D. all areas with coral reefs.
Swimming sperm characterize
A) mosses only. B) seed plants only. C) mosses and ferns. D) mosses, ferns, and seed plants.
Without greenhouse gasses, Earth's average air temperature would be well below zero degrees
Fahrenheit. Indicate whether the statement is true or false.