07_InstSolManual_PDF_Part14 - 7-14 Chapter 7 7.63 Set Up...

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7.63 Set Up: For part (a) use to solve for W , the energy the bulb uses. Then set this value equal to for part (b), and solve for the speed. In part (c), equate the W from part (a) to and solve for the height. Solve: (a) (b) so (c) so Reflect: (b) Olympic runners achieve speeds up to approximately or roughly one third the result calculated. (c) The tallest tree on record, a Redwood, stands 364 ft or 110 m, or 4.7 times smaller than the result. 7.64. Set Up: Use the relation to relate the given power and velocity to the force required. Recall that a watt represents the rate of energy—a joule per second. Solve: The force required is thus 7.65. Set Up: Since the electricity cost rate is given in cents per each power must be multiplied by the corresponding time usage in determining the cost: Solve: (a) (b) Reflect: Note that the cost of running the motor for an entire day is thus, the cost of running the motor is times the cost of running the light. 7.66.
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