"North America and Europe are in the midst of a large-scale experiment. Sulfuric and nitric acids have acidified soils, lakes, and streams, thereby stressing or killing terrestrial and aquatic biota."(365) Assess this statement
What is meant by the word "experiment" here?
This statement is saying that the release of SO2 and NOx from smokestacks of
(mostly) coal-fired power plants has resulted in concrete harm to wildlife and fish. The
"experiment" is the construction and use of these SO2 and NOx emitters without due
consideration of the consequences of the emissions or concentrated effort to reduce or
reverse what is being done.
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A 0.50-kg box is attached to an ideal spring of force constant (spring constant) 20 N/m on a horizontal, frictionless floor. The box oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position
(a) What is the amplitude of vibration? (b) At what distance from the equilibrium position are the kinetic energy and the potential energy the same?
To orient a single crystal in an x-ray beam, it would be best to use
(a) A Debye-Scherrer camera (b) The Laue technique (c) A powder diffractometer (d) A single-crystal diffractometer
In what direction did the heat flow in this experiment?
A 4.0-kg block slides down a 35° incline at a constant speed when a 16-N force is applied acting up and parallel to the incline. What is the coefficient of kinetic friction between the block and the surface of the incline?
A. 0.20 B. 0.23 C. 0.26 D. 0.33 E. 0.41