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
Likurg_2 [28]
3 years ago
5

Radiation from the head is a major source of heat loss from the human body. Model a head as a 21-cm-diameter, 20-cm-tall cylinde

r with a flat top.
If the body's surface temperature is 36?C , what is the net rate of heat loss on a chilly 9?C day? All skin, regardless of color, is effectively black in the infrared where the radiation occurs, so use an emissivity of 0.95.

I have worked it through three times with other written solutions however i cannot arrive at the correct answer. A final answer as well as a solution would be appreciated! Thanks!
Biology
1 answer:
Leto [7]3 years ago
4 0
We have the following assumptions:
The temperature of the surroundings remains constant.
The entire surface area of head emits radiation.

From the problem, we have the given values:
emissivity = 0.95
T2 = 36 degrees C
T1 = 9 degrees C

Solving for the area:
A = πD² + πDh = π(21)² + π(21)(20) = 2709.91 cm² = 0.2710 m²

Using the heat transfer equation for radiation:
q = εAσ(T₂⁴ - T₁⁴)
q = 0.95 (0.2710)(5.67 x 10<span>-8)[(36+273)</span>⁴-(9+273)⁴]
q = 3.9 x 10^9 W
You might be interested in
Molecular phylogenies show all land plants are a monophyletic group. This suggests ________.
guapka [62]

Answer:

D.  There was a single transition from aquatic to terrestrial habitats

Explanation:

Based on the molecular differences at the level of DNA sequence and inheritance, the molecular phylogenies show that all land plants are a monophyletic group. This is why it suggests a single transition from aquatic to terrestrial habitats occur.

5 0
3 years ago
The grey area surrounded by the stage is called​
Aleks [24]

Answer:

Figure 1-4 shows one with an animation in progress. Work area is the technical name for the gray area surrounding the stage, although many Flash-ionados call it the backstage. ... The Stage is where you draw the pictures that will eventually become your animation.

Explanation:

3 0
3 years ago
What is a test variable? Give an example.
Sphinxa [80]

Answer:

skynesher / Getty Images. The dependent variable is the variable that is being measured or tested in an experiment. For example, in a study looking at how tutoring impacts test scores, the dependent variable would be the participants' test scores, since that is what is being measured.

Explanation:

Hope this helps, If it did, then I would really appreciate it if you gave me Brainliest, I only need one more to rank up and it has taken forever to get to where I am currently. Thanks.

6 0
2 years ago
Read 2 more answers
The angle of Earth's tilt has changed throughout Earth's history and is still changing today. If Earth's tilt were to decrease
olganol [36]

Answer:

The world climate would drastically change.

Explanation:

  • First off, both poles would have rapid expansion, with the freezing of more water near the poles.
  • Many species of trees and plants would die out in certain areas, since they tend to be in their ideal locations, so the change in climate will make the northern parts of many habitats destroyed.
  • Deserts would expand and the average temperature would rise.
  • Also, many animals would also die out, because of the change in their environments.
  • Conifers would shift southward, causing many forests / parts of forests to turn into wastelands, causing the earth's oxygen production to decrease.
8 0
3 years ago
The normal sequence of genes along a hypothetical chromosome is ABC*DEFGH, where letters represent genes and the asterisk (*) re
Hunter-Best [27]

Answer:

The correct option is e

Explanation:

An inversion mutation is a situation in which a sequence of the gene on a chromosome breaks out and rearranges itself from reverse (to the beginning) and then attaches itself back to the point of breakage of the same chromosome.

From the question, mutation changed the gene sequence from ABC*DEFGH to ABC*DGFEH. From this mutation, it can be seen that the gene sequence "EFG" broke-out, rearranged itself from reverse to the beginning as "GFE" and then attached itself back to the points of breakage.

NOTE: This type of inversion is called paracentric inversion since the centromere (represented as * in the question) is not part of the breakage.

8 0
3 years ago
Other questions:
  • Which is one of the of energy resources for natural processes on Earth?
    8·2 answers
  • Explain why the temperature of water stays the same for a while once it starts boiling?
    6·2 answers
  • Why can a single redwood tree be thought of as an entire ecosystem? because a single redwood is bigger than some ecosystems beca
    6·1 answer
  • Structurally, the human liver is divided into how many lobes?
    12·1 answer
  • Measuring the mass of a black bean? kilogram or milligrams
    7·1 answer
  • Which is a common age-related physical change that may affect digestion and food intake?
    8·1 answer
  • Explain how the adaptations of the pentadactyl limbs are adapted for swimming in whales, running in lizards and grasping in frog
    7·1 answer
  • How would you calculate the distance of a paper airplane
    12·1 answer
  • Particle move across a membrane:
    8·1 answer
  • __________ is derived from the motion of waves and tides.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!