How might you separate a mixture of sand and salt?
A) with tweezers and a magnifying glass
B) just add water
C) heat the mixture until one of the components melts
D) Two of the above answers are reasonable.
Answer: D
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Earth outgassed as much carbon dioxide as Venus, but it is locked up in the oceans and rocks
Indicate whether the statement is true or false
Standing Sound Waves: A 0.13-m string, fixed at both ends and vibrating in its n = 4 harmonic, excites a pipe that is 0.88 m long and open at both ends, into its second overtone resonance. What is the speed of transverse waves on the string? The speed of sound in air is 345 m/s.
A. 38 m/s B. 36 m/s C. 34 m/s D. 32 m/s E. 30 m/s
Conditions for the preservation of fossils are best achieved
A) in desert environments. B) in glaciated environments. C) in shallow river beds. D) on the floors of shallow seas.
Which of the following are not inertial reference frames?
1) a desk on the floor 2) a car going around a curve 3) an airplane taking off 4) a car traveling at a constant velocity 5) a moving sidewalk