Science is a body of knowledge that
A) describes order in nature.
B) is an ongoing human activity.
C) condenses knowledge into testable laws.
D) all of the above
E) none of the above
Answer: D
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The peak strength in a precipitation-hardened alloy occurs when
(a) The alloy is quenched. (b) The precipitate is coherent. (c) The precipitate changes from coherent to incoherent. (d) The precipitate is incoherent.
A 3.00 kg pendulum bob on a string 2.00 m long is released with a velocity of 2.00 m/s when the support string makes an angle of 45.0 degrees with the vertical. What is the tension in the string at the highest point of its motion?
A. 12.5 N B. 17.8 N C. 21.4 N D. 28.9 N E. 31.6 N
During the period of one day, the number of high tides at a given location is about __________
Fill in the blank(s) with correct word
In these figures, we see a boy named Billy riding a carnival ride called the Rotor and the free-body diagram for the forces acting on him. What must be the magnitudes of the vectors fwall,Billy and WEarth,Billy if Billy remains at the same height along the wall?
a. fwall,Billy is greater than WEarth, Billy to keep Billy from falling. b. The magnitudes of fwall,Billy and WEarth, Billy are equal. c. fwall,Billy depends on the magnitude of Nwall,Billy, but the magnitude of WEarth,Billy is always the same. d. Nwall,Billy and fwall,Billy must be equal in magnitude.