Passing arsenic contaminated water through a long pipe filled with sand and iron powder leads to removal of the arsenic by
A) a physical change.
B) an oxidation-reduction reaction.
C) ion exchange.
D) filtering out the suspended arsenic particles.
E) only a and b
Answer: B
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Uniform Circular Motion: The Moon is accelerated toward the earth, so it is gradually getting closer to the earth.
A. True B. False C. The moon is not accelerated toward the earth.
Earth's radius is about
a. 3600 km. b. 5800 km. c. 6400 km. d. 4400 km.
An automobile manufacturer claims that its product will, starting from rest, travel 0.40 km in 9.0 s. What is the magnitude of the constant acceleration required to do this?
a. 9.9 m/s2 b. 8.9 m/s2 c. 6.6 m/s2 d. 5.6 m/s2 e. 4.6 m/s2
A baseball batter hits an incoming 40 m/s fastball. The ball leaves the bat at 60 m/s after a ball-on-bat contact time of 0.030 s. What is the force exerted on the 0.15 kg baseball?
a. 450 N c. 90 N b. 250 N d. 500 N