Water being purified using aluminum salts and a base is an example of
A) a physical separation.
B) a chemical reaction.
C) an acid-base reaction.
D) a chemical separation.
E) none of the above
Answer: A
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Earth doesn't experience a solar eclipse every month because
a. of unpredictable weather patterns. b. the Moon always keeps its same side toward the Earth. c. the Moon's orbit plane is not aligned with the Earth's orbit plane. d. its sometimes nighttime when the eclipse occurs. e. sometimes the Moon is too far away.
A mass 
is connected by a light string that passes over a pulley of mass M to a mass 
sliding on a frictionless horizontal surface as shown in the figure. There is no slippage between the string and the pulley. The pulley has a radius of 25.0 cm and a moment of inertia of 1?2 
If 
is 1.00 kg, m2 is 2.00 kg, and M is 4.00 kg, then what is the tension in the string attached to 
?
A. 6.83 N
B. 7.03 N
C. 7.84 N
D. 8.02 N
E. 8.33 N
The tension in each of two strings is adjusted so that both vibrate at exactly 666 Hz. The tension in one of the strings is then increased slightly. As a result, six beats per second are heard when both strings vibrate
What is the new frequency of the string that was tightened? A) 672 Hz B) 660 Hz C) 669 Hz D) 663 Hz
A baseball outfielder throws a baseball of mass 0.36 kg at a speed of 34.0 m/s and initial angle of 30°. What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction
a. zero b. 312 J c. 156 J d. 52.0 J e. 208 J