# Homework Help: I have no idea how to solve this ques

1. Jun 18, 2011

### reyunknown

Make an order-of-magnitude estimate of the cost of one person’s routine use of a hair dryer for 1 yr. If you do not use a blow dryer yourself, observe or interview someone who does. State the quantities you estimate and their values.

2. Jun 18, 2011

### bp_psy

Find out the power of a dryer (Google) and the cost of a kWh in your area (Google).Estimate the time somebody uses the dryer in a year in hours.Compute the number of kWh then the price.

3. Jun 18, 2011

### Pengwuino

By the way, this topic is not a topic for advanced physics. This is something for introductory physics.

The question should be very intuitive. The best part about order-of-magnitude questions is that you can, for example, say a new flat screen tv costs $2000 or$5000 and as an order of magnitude calculation goes, they're the exact same answer.

4. Jun 19, 2011

### reyunknown

Thx for helping !!