Bullets are fired from an airplane in the forward direction of motion. The momentum of the airplane will be
A) decreased.
B) unchanged.
C) increased.
A
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Name three human systems vulnerable to chemical effects. Then, for each of the three systems, provide two examples of harm to humans and the chemicals that cause the harm.
What will be an ideal response?
What was the first country to use the railroad?
A) Britain B) France C) Germany D) U.S. E) Italy
A major motivation for colonization of the continent of Africa was the lucrative opportunities in the slave trade there
Indicate whether the statement is true or false
Which of the following is NOT a source of atmospheric oxygen in the oxygen cycle?
A) The weathering of rocks B) The burning of fossil fuels C) Water from plant transpiration D) Decomposition of water during photosynthesis E) Decomposition of nitrogen by solar energy