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# The units of mass are kg and the units of distance

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, the units of mass are kg , and the units of distance are m . For this equation to have consistent units, the units of G must be which of the following? ANSWER: Part B One consequence of Einstein's theory of special relativity is that mass is a form of energy. This mass- energy relationship is perhaps the most famous of all physics equations:

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E = mc 2 , where m is mass, c is the speed of the light, and E is the energy. In SI units, the units of speed are m/s . For the preceding equation to have consistent units (the same units on both sides of the equation), the units of E must be which of the following? ANSWER: #4 Part A To seven significant digits, the mass of a proton is 1.672623 × 10 27 kg . Which of the following choices demonstrates correct rounding? ANSWER: Part B To eight significant digits, Avogadro's constant is 6.0221367 × 10 23 mol 1 . Which of the following choices demonstrates correct rounding? ANSWER: Part C The distance between point A and point B is given as 20000m. According to the significant digits convention used in Mazur's Principles and Practice of Physics , how many significant digits is this distance given to? ANSWER: five #5 How many nanoseconds does it take light to travel a distance of 3.30 km in vacuum? ANSWER: Chapter 1 #6
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