Chapter 11: Q20Q (page 292)
How much longer (percentage) is a one-mile race than a 1500-mile race (“the metric mile”)?
A one-mile race is 7.27% longer than a 1500-mile race.
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The two pulses shown in Fig. 11–54 are moving toward each other. (a) Sketch the shape of the string at the moment they directly overlap. (b) Sketch the shape of the string a few moments later. (c) In Fig.11–37a, at the moment the pulses pass each other, the string is straight. What has happened to the energy at this moment?
A 62 kg person jumps from a window to a fire net 20.0 m directly below, which stretches the net 1.4 m. Assume that the net behaves like a simple spring. (a) Calculate how much it would stretch if the same person were lying in it. (b) How much would it stretch if the person jumped from 38 m?
Add \(\left( {{\bf{9}}{\bf{.2 \times 1}}{{\bf{0}}^{\bf{3}}}{\bf{ s}}} \right){\bf{ + }}\left( {{\bf{8}}{\bf{.3 \times 1}}{{\bf{0}}^{\bf{4}}}{\bf{ s}}} \right){\bf{ + }}\left( {{\bf{0}}{\bf{.008 \times 1}}{{\bf{0}}^{\bf{6}}}{\bf{ s}}} \right)\).
One hectare is defined as \({\bf{1 \times 1}}{{\bf{0}}^{\bf{4}}}\;{{\bf{m}}^{\bf{2}}}\). One acre is \({\bf{4}}{\bf{.356 \times 1}}{{\bf{0}}^{\bf{4}}}\;{\bf{f}}{{\bf{t}}^{\bf{2}}}\). How many acres are there in one hectare?
(a) How many seconds are there in 1.00 year? (b) How many nanoseconds are there in 1.00 year? (c) How many years are there in 1.00 second?
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