A pharmaceutical company wishes to study a possible new headache medicine. They are doing human trials with 1000 volunteers and need to ________
A) put all women in the control group and all men in the experimental group
B) give both control and experimental groups the same amount of the new medication
C) control for the type of headache—stress, migraine, or other causes
D) have 10 volunteers in the control group
E) divide the groups by level of health
C
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According to the impulse-momentum equation Ft = change in (mv), a bungee jumper in fall has momentum which is reduced by the force F exerted by the bungee cord. If m is the mass of the jumper, then v in the equation is the speed of the
A) jumper. B) cord. C) both A and B D) none of the above
Which of the following represents an alarming positive feedback loop of global warming?
A) Increasing temperatures raise humidity, which further increases temperatures. B) Decreased pH of the ocean increases the rate at which carbon dioxide is absorbed by the oceans from the atmosphere. C) Increased use of fossil fuels adds ozone to the stratosphere, which traps more heat. D) Increased levels of atmospheric carbon dioxide decreases photosynthesis, which further increases atmospheric levels of carbon dioxide.
The word _______________ is a Japanese word meaning harbor wave
Fill in the blank with correct word.
Aftershocks occur because ________
A) the area surrounding a region that experienced a large earthquake needs time to adjust to the displacements on the main fault B) the day after a large earthquake there are tidal forces that continue to create additional earthquakes C) seismic energy continues to build up for a period of time after a major earthquake D) there are always small earthquakes on major faults, but we do not notice them until there is a large event that makes us aware of them