1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Tomtit [17]
2 years ago
7

An electrical heater 100 mm long and 5 mm in diameter is inserted into a hole drilled normal to the surface of a large block of

material having a thermal conductivity of 5 W/m · K. Estimate the temperature reached by the heater when dissipating 50 W with the surface of the block at a temperature of 25°C.
Physics
1 answer:
slega [8]2 years ago
5 0

Answer:

T_{1}=94.9^{o}C

Explanation:

Given data

length=100mm

Diameter=5mm

Thermal conductivity=5 W/m.K

Power=50 W

Temperature=25°C

The temperature of heater surface follows from the rate equation written as:

T_{1}=T_{2}+\frac{q}{kS}

Where S can be estimated from the conduction shape factor for a vertical cylinder in semi infinite medium

S=\frac{2\pi L}{ln(\frac{4L}{D} )} \\

Substitute the given values

S=\frac{2\pi (0.1m)}{ln[\frac{4*0.1m}{0.005m} ]}\\ S=0.143m

The temperature of heater is then:

T_{1}=25^{o}C+\frac{50W}{5W/m.K*0.143m} \\T_{1}=94.9^{o}C

The temperature reached by the heater when dissipating 50 W with the surface of the block at a temperature of 25°C.

                           T_{1}=94.9^{o}C

You might be interested in
What type of epithelia membrane covers the outaide surface of the body?
kirza4 [7]

The parietal layers of the membranes line the walls of the body cavity.


hope this helps

3 0
3 years ago
What happens to the velocity of a sound wave in air if the temperature of the air increases?
Yuki888 [10]
The answer is D :) hope this helps
6 0
2 years ago
Read 2 more answers
Seafloor spreading is a process that occurs along ___________1____________. At ___________2____________ boundary, two plates mov
sergejj [24]

Answer:

where is the answer choices

Explanation:

5 0
2 years ago
What is the difference between elastic PE and gravitational PE?
asambeis [7]
Elastic potential energy is kind of like pulling on something and then letting it go, with rubber bands, or a bow, or a slingshot, something with elastic properties.
Gravitational potential energy has to do with how high something is, and has to do with earth’s gravitational pull.
7 0
3 years ago
Read 2 more answers
Tamiko it's creating a list of characteristics traditionally associated with males in American society. which current characteri
Irina-Kira [14]
It is A !! Woot woot
3 0
3 years ago
Read 2 more answers
Other questions:
  • Cochlear implants are surgically implanted electronic devices that send __________. A. electronic signals to the auditory nerve
    7·2 answers
  • The unit of entropy ?
    15·2 answers
  • What happens to the efficiency of a ramp if friction is reduced?
    8·1 answer
  • What is the atomic number of an Neon atom with 10 protons and 11 neutrons in its nucleus, & 10 Electrons in orbitals around
    10·2 answers
  • Only a fraction of the electrical energy supplied to a tungsten light bulb is converted to visible light. The rest of the energy
    8·1 answer
  • If you push a book against a wall hard enough it will not slide down even though gravity is pulling it. Use what you know about
    12·1 answer
  • Which quantity is a vector quantity A. Acceleration B. Mass C. Speed D. Volume
    10·1 answer
  • Suppose you have a pendulum clock which keeps correct time on Earth(acceleration due to gravity = 1.6 m/s2). For ever hour inter
    5·1 answer
  • Which statement correctly describes gravity?
    8·1 answer
  • Which common characteristic of planets do Saturn and Earth share?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!