Very small cloud droplets of pure water can evaporate even when the relative humidity is 100 percent
a. True
b. False
ANSWER: True
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Which of the following is not true of the Intergovernmental Panel on Climate Change (IPCC)?
A) In its 2007 assessment, the IPCC identified a number of ways in which climate is changing. B) The IPCC's assessment included statements reflecting the confidence of the participating scientists that the current climate changes began in the twentieth century. C) The IPCC stated that warming is caused at least in part by humans. D) The IPCC stated that warming will occur in the twenty-first century. E) The IPCC stated that changes in human behavior will not reduce warming in the future.
In cooperation with the United Nations, WHO proclaimed 2011-2020 the Decade of Action for Road Safety to try to turn what frightening trend around?
a) A steady increase in deaths of children under age 5 due to incorrect usage of child restraints b) Traffic accidents trending towards being the third-leading cause of death worldwide by 2020 c) An increase in accidents among baby boomers d) Pedestrian deaths trending upwards of 50% of fatalities in developing countries
When water freezes, it can expand up to what percentage?
a. 9% b. 29% c. 59% d. 79% e. 99%
When a car travels around a circular track at a constant speed, its
A. acceleration is zero. B. velocity is zero. C. both of these D. none of the above