Low air pressure is associated with warm air temperatures.
Indicate whether the statement is true or false.
Answer: True.
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Alyssa throws a snowball horizontally from the top of a roof; Ryan throws a snowball straight down from the same point. Once in flight, the acceleration of Alyssa’s snowball is _____ the acceleration of Ryan’s snowball.
A. greater than B. less than C. equal to
How many radioactive atoms are present in a sample that has an activity of 0.5 ?Ci and a half-life of 10 years? (1 curie = 3.7 × 10^10 decays/s)
a. 9.5 × 10^12 atoms b. 8.4 × 10^12 atoms c. 7.3 × 10^12 atoms d. 6.5 × 10^12 atoms e. 2.7 × 10^5 atoms
According to the law of poles, like poles ______________
Fill in the blank(s) with correct word
Why do hot water heaters lose their efficiency quicker in households with hard water?
A) The hard water calcium and magnesium ions corrode the heating element. B) The hard water calcium carbonate deposits oxidize the inner tank wall. C) The calcium carbonate on the inner surface of the hot water tank builds up to the point that it insulates the water from the heating element. D) The hard water calcium ions exchange with iron ions from the inner metal wall which react with the water heater base to form rust and deteriorate the bottom of the tank.