P H Y S I C S Chapter 4: Work and Energy Section 4F: Power.

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Presentation transcript:

P H Y S I C S Chapter 4: Work and Energy Section 4F: Power

Power The rate at which work is done

Work vs. Power Student A Student B

Work vs. Power Power accounts for “how fast” work is done A B

Power Equation

Household Appliances 60W light bulb - 60W Toaster : W Microwave : W Dishwasher : W Washing Machine : 500W Vacuum Cleaner : W Clothes dryer : 4000W Ceiling Fan : 10-50W Hair Blow dryer : 1000W Laptop Computer : 20-50W Desktop Computer : W Cell Phone Charger: 3-5W iPod/iPad Charger: 10W

Horsepower 1 horsepower (hp) = 746 Watts

In-Class Problem #1 What force would a 300 hp engine have to produce to keep a vehicle at a steady 23 m/s against air resistance and friction? F = 9,730 N Engine Force Air Resistance Friction

In-Class Problem #2 A 300 kg crate needs to be hoisted to a height of 20 m. How long will a 1500 W crane motor take to do this? t = 40 s

Assignment Problem Set 4F 4E-4F Quiz (Non-Conservative Forces and Power)

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