A 3.00-m long plank of negligible mass has a 30.0-kg mass at one end and a 40.0-kg mass at the other end. How far from the 30.0-kg mass should a fulcrum be placed so that the plank is balanced?
A)
1.71 m
B)
1.29 m
C)
0.750 m
D)
1.50 m
E)
2.25 m
A
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A) 0.52 s B) 1.2 s C) 2.4 s D) 3.1 s E) 4.2 s
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A) carbon monoxide B) nonvolatile liquids C) molten iron D) sodium chloride
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A) as in many other professions, will be excused by the scientific community. B) gets no second chance in the scientific community. C) is elevated in the scientific community.
Has Polaris always been the "North Star" , also known as the "Pole Star" ?
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