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Chapter 1: Problem 72
The radius of Earth is \(6378 . \mathrm{km}\). What is its circumference to three significant figures?
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What is the number of carbon atoms in 0.5 nanomoles of carbon? One mole contains \(6.02 \cdot 10^{23}\) atoms. a) \(3.2 \cdot 10^{14}\) atoms d) \(3.2 \cdot 10^{17}\) atoms b) \(3.19 \cdot 10^{14}\) atoms e) \(3.19 \cdot 10^{17}\) atoms c) \(3 . \cdot 10^{14}\) atoms f) \(3 . \cdot 10^{17}\) atoms
What is(are) the difference(s) between 3.0 and \(3.0000 ?\) a) 3.0000 could be the result from an intermediate step in a calculation; 3.0 has to result from a final step. b) 3.0000 represents a quantity that is known more precisely than 3.0 c) There is no difference. d) They convey the same information, but 3.0 is preferred for ease of writing
A tank is in the shape of an inverted cone, having height \(h=2.5 \mathrm{~m}\) and base radius \(r=0.75 \mathrm{~m} .\) If water is poured into the tank at a rate of \(15 \mathrm{~L} / \mathrm{s}\), how long will it take to fill the tank?
What angle does \(\vec{B}=\left(B_{x}, B_{y}\right)=(30.0 \mathrm{~m}, 50.0 \mathrm{~m})\) make with the positive \(x\) -axis? What angle does it make with the positive \(y\) -axis?
Find the magnitude and direction of \(-\vec{A}+\vec{B},\) where \(\vec{A}=(23.0,59.0), \vec{B}=(90.0,-150.0)\)
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