When Joan pushes a crate across a level floor at constant velocity, friction between the crate and the floor is
A. the same amount as her pushing force.
B. less than her pushing force.
C. more than her pushing force.
D. none of the above
Answer: A
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The Southern Oscillation is in a negative phase when pressures
A) are low in both Tahiti and Darwin. B) equal out in both Tahiti and Darwin. C) are higher in Tahiti than in Darwin. D) are higher in Darwin than in Tahiti.
The most effective way to reduce GHG emissions is to increase
A) the production of electric cars. B) energy efficiency and renewable energy. C) our reliance on widely available natural gas resources. D) the use of coal gasification plants and scrubber technologies to reduce sulfur emissions.
Which of the following is a secondary messenger?
A) cAMP B) estradiol C) vasopressin D) none of these
The most explosive events to occur on the Sun are ________
A) solar flares B) solar winds C) umbras D) sunspots E) filaments