A 2000-N bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is
A. 20 N.
B. more than 2000 N.
C. 200 N.
D. 2000 N.
Answer: D
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When 500-N Danny Diver steps off a diving board that is 10 m above the water, he hits the water with kinetic energy of
A. 510 J. B. 500 J. C. 10 J. D. 5000 J.
Integrated pest management (IPM) is a great way for farmers to reduce pesticide use and save money in the long term, but it does not work in every situation.
Answer the following statement true (T) or false (F)
This map shows contours of the water table and the location of a factory that contaminated groundwater. Where would you drill wells to intercept the contamination?
A. southeast of the factory B. southwest of the factory C. right next to the factory D. north of the factory
Biomes exhibit ________ patterns in habitat characteristics.
A. longitudinal B. latitudinal C. seasonal