Question

A hair dryer has a resistance wire of 1200‐W. The resistance wire has a diameter of...

A hair dryer has a resistance wire of 1200‐W. The resistance wire has a diameter of D = 0.3 cm and is 80 cm long.

(a) Determine the rate of heat generation in the wire per unit volume, in W/cm3.

(b) Determine the heat flux on the outer surface of the wire as a result of this heat generation.

Engineering   Chemical-Engineering   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
How many kilocalories of heat does the operation of a 1200 W hair dryer produce each...
How many kilocalories of heat does the operation of a 1200 W hair dryer produce each second? How much heat in kcal must be added to 0.5kg of water at room temperature (20°C) to raise its temperature to 50°C? How much heat in kcal is necessary to change 500 g of ice at -15°C to water at 20°C? A cylinder of gas is at room temperature (20°C). The air conditioner breaks down, and the temperature rises to 60°C. The new...
A 12 meter long and 12 mm inner diameter smooth pipe is used to heat a...
A 12 meter long and 12 mm inner diameter smooth pipe is used to heat a liquid in an industrial process. The liquid enters the pipe at a temperature of 25o C and a mean velocity of 0.80 m/s. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the pipe so that the fluid exits at 75o C. The fluid average properties are ? = 1000 kg/m3 , Cp = 4000 J/kg·K,...
1) Determine the resistance of a silver wire that has a diameter of 1 mm and...
1) Determine the resistance of a silver wire that has a diameter of 1 mm and a length of 1 m. Express your answer in ohms. electrical conductivity = 6.8x10^7 omega.m^-1 2) Determine the resistance of a silver nanowire that has a diameter of 30 nm and a length of 1 µm.  Express your answer in ohms.?
A concentric tube heat exchanger is comprised of a stainless steel (ks = 40 W/mK) inner...
A concentric tube heat exchanger is comprised of a stainless steel (ks = 40 W/mK) inner pipe, NPS 2- nominal schedule 40 size (corresponding to an inner diameter of 52.5 mm and an outer diameter of 60.3 mm), and an outer stainless steel pipe of NPS 3-nominal schedule 40 (ID = 77.9 mm, OD = 88.9 mm). The heat exchanger has an effective length of 35 m. The inner pipe fluid is ammonia (?a = 0.3 · 10?6 m2/s, cpa...
A wire 3.31 m long and 6.32 mm in diameter has a resistance of 12.1 mΩ....
A wire 3.31 m long and 6.32 mm in diameter has a resistance of 12.1 mΩ. A potential difference of 27.8 V is applied between the ends. (a) What is the current in amperes in the wire? (b) What is the magnitude of the current density? (c) Calculate the resistivity of the material of which the wire is made.
A concentric tube heat exchanger is comprised of a stainless steel (ks = 40 W/mK) inner...
A concentric tube heat exchanger is comprised of a stainless steel (ks = 40 W/mK) inner pipe, NPS 2- nominal schedule 40 size (corresponding to an inner diameter of 52.5 mm and an outer diameter of 60.3 mm), and an outer stainless steel pipe of NPS 3-nominal schedule 40 (ID = 77.9 mm, OD = 88.9 mm). The heat exchanger has an effective length of 35 m. The inner pipe fluid is ammonia (va = 0.3 · 10-6m2/s, cpa =...
A wire loop of radius 10 cm has a resistance of 2.0 ?. The loop is...
A wire loop of radius 10 cm has a resistance of 2.0 ?. The loop is at right angles to a uniform magnetic field B. The field strength is changing at a rate of ?B/?t = 0.10 T/s. What is themagnitude of the induced current in the loop? A. 4.3 mA B. 0.3 mA C. 2.9 mA D. 1.0 mA E. 1.6 mA
A 1.60 cm × 1.60 cm square loop of wire with resistance 1.10×10?2 ? has one...
A 1.60 cm × 1.60 cm square loop of wire with resistance 1.10×10?2 ? has one edge parallel to a long straight wire. The near edge of the loop is 1.00 cm from the wire. The current in the wire is increasing at the rate of 100 A/s . A. What is the current in the loop?
A circular wire loop 39 cm in diameter has resistance 120 Ω and lies in a...
A circular wire loop 39 cm in diameter has resistance 120 Ω and lies in a horizontal plane. A uniform magnetic field points vertically downward, and in 25 ms it increases linearly from 5.0 mT to 55 mT. Find the magnetic flux through the loop at the beginning. ( Φ1 = ? mWb ) Find the magnetic flux through the loop at the end of the 25-ms period. Φ2 = ? mWb What's the loop current during this time? Express...
A 85-turn circular coil has diameter 4.2 cm and resistance 2.7 Ω . This coil is...
A 85-turn circular coil has diameter 4.2 cm and resistance 2.7 Ω . This coil is placed inside a solenoid, with coil and solenoid axes aligned. The solenoid has 4800 turns of wire and is 25 cm long. If the solenoid current increases steadily from 0 to 10 A in 2.7 s , find the induced emf in the coil.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT