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Unformatted text preview: Example 4 is the hardest one. Trick : v depends on x , rather than t . Know why (30) has signs, due to the Fact that the positive xaxis points away From the center oF the earth. Think about the reasoning behind Equations (31) (33) careFully. Examples from 9th ed. book 4. (a) dQ dt = 3 2 Q 200+ t initial value Q (0) = 100 (b) concentration Q 200+ t 6. (a) conservation oF energy (b) dV dt = a 2 gh V ( h ) = h A ( u ) du 26. (a) m dv dt = mg kv (b) LHospitals rule 29. (a) m dv dt = G Mm ( R + x ) 2 g = GM R 2 = 78545mi/hr 2 (b) dx dt = v 1...
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 Spring '08
 Fonken

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