
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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What is the efficiency of an electric generator that produces 1.17 kwh per kg of coal burned beef combustion of coal is 6.71 * 10 to the 6th power j / kg
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- A certain hand crank generates power at 75 W how long will it need to run to fully charge a battery which holds a total energy of 3000 J answer in secondsarrow_forwardAs you learned in this course, there are many different energy transformations to accomplish the same tasks. The screen on your phone is actually an energy transformation technology. It converts electrical energy to radiant energy ight) There are many technologies which can be used to produce a screen, and their efficiency is linked in a complex manner to the colours in the image they display D Here is a simplified example: Power consumption Usable light output power Organic light emitting diode (OLED) 2.0 W 0.38 W Liquid crystal display (LCD) 3.0 W 0.25 Warrow_forward16. How much energy is dissipated in braking a 1200-kg car to a stop from an initial speed of 30 m/s? A) 24 000 J B) 280 000 J C) 540 000 J D) 820 000 J E) 12 000 Jarrow_forward
- What is the work done by a 300-watt electric grinder in 5 minutes? 90 J 0 1 kJ O 90 kJ 01Jarrow_forwardWhat is the efficiency of an electric generator that produces 1.75 kwh per kg of coal burned. The heat of combustion of coal is 6.71 x 10 to the 6 power j / kgarrow_forwardCalculate the power when a force of 60 N moves an object over 0.6 Km in 20 minutes A. 100watts B. 6,000 watts C. 0.25watts D. 30 wattsarrow_forward
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