**Question 9:**The motor of a boat develops 60 kW when the boat's speed is 15 km/h. With how much force does the water resist the motion of the boat? **Physics Problem Example: Calculating Average Power Output****Problem Statement:**11. A weightlifter raises a 70-kg barbell from the floor to a height of 2.2 m in 1.2 s. What was his average power output during the lift?**Solution:**To find the weightlifter's average power output, we need to determine the work done and the time over which it was done. Power is given by:\[ \text{Power (P)} = \frac{\text{Work Done (W)}}{\text{Time (t)}} \]**Step-by-Step Solution:**1. **Calculate the Work Done:** Work done (W) against gravity is given by: \[ W = m \cdot g \cdot h \] Where: - \( m \) = mass of the barbell = 70 kg - \( g \) = acceleration due to gravity = 9.8 m/s² - \( h \) = height = 2.2 m Substituting the values: \[ W = 70 \, \text{kg} \times 9.8 \, \text{m/s}^2 \times 2.2 \, \text{m} \] \[ W = 70 \times 9.8 \times 2.2 \] \[ W = 1509.6 \, \text{J} (Joules) \]2. **Calculate the Average Power:** Using the formula for power: \[ P = \frac{W}{t} \] Where: - \( W \) = 1509.6 J - \( t \) = time taken = 1.2 s Substituting the values: \[ P = \frac{1509.6 \, \text{J}}{1.2 \, \text{s}} \] \[ P = 1258 \, \text{W} (Watts) \]Therefore, the weightlifter's average power output during the lift is 1258 W.

Given 9. Power of motor of a boat = P = 60 kW Speed of boat = 15 km/h We have to calculate the water…

Answered: 9. The motor c speed is 15 resist the…

9. The motor c speed is 15 resist the mo

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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