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
sergeinik [125]
3 years ago
11

It has been suggested that a heat engine could be developed that made use of the fact that the temperature several hundred meter

s beneath the surface of the ocean is several degrees colder than the temperature at the surface. In the tropics, the temperature may be 6 degrees C and 22 degrees C, respectively. What is the maximum efficiency (in %) such an engine could have?
Physics
1 answer:
lesantik [10]3 years ago
8 0

Answer:

efficiency = 5.4%

Explanation:

Efficiency of heat engine is given as

\eta = \frac{W}{Q_{in}}

now we will have

W = Q_1 - Q_2

so we will have

\eta = 1 - \frac{Q_2}{Q_1}

now we know that

\frac{Q_2}{Q_1} = \frac{T_2}{T_1}

so we have

\eta = 1 - \frac{T_2}{T_1}

\eta = 1 - \frac{273+6}{273+22}

\eta = 0.054

so efficiency is 5.4%

You might be interested in
If your front lawn is 21.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates 1350 new snowflakes every minu
ziro4ka [17]

Answer:

snow is 64.638 kg / hr

Explanation:

Given data

wide w = 21 feet

long L = 20 ft

area A = 1350 square foot

mass of snow m  = 1.90 mg

to find out

snow in kilograms / hour

solution

we will find snow in kg

so we apply formula that is

snow kg / hour  = w × L ×A ×  m × 60/10^6

put all value we get  snow

snow =  21 × 20 × 1350 ×  1.90 × 60/10^6

snow =  420 × 1350 ×  1.90 × 60/10^6

snow =  1077300 × 60/10^6

snow =  64.638

hence snow is 64.638 kg / hr

7 0
3 years ago
Find the weight of a 4.2 kg backpack,<br> A) 41.16 N<br> B) 0.42 kg<br> C) 41.16 kg<br> D) 0.42 N
Olin [163]

Answer:

Although the weight is given and we are asked for the weight, the odd wording of the question implies that we are being asked for the gravitational force on the backpack.

If it is gravitational force that is being requested, then the correct answer is A) 41.16 Newtons.

If it is actual weight being asked for, then none of the answers are correct, as the weight of 4.2 kg is given in the question, and does not match any of the answers.

6 0
3 years ago
Type the correct answer in each box. Use numerals instead of words. If necessary, use / for the fraction bar. In a survey conduc
jarptica [38.1K]

Answer: The expected population that wants flexible working hours in ranging from 58% to 62 %.

Explanation:

Percentage of sample respondents agreed for flexible working hours = 60%

The margin of the error = ± 2%

The expected population that wants flexible working hours in ranging from:

\text{percentage of agreed}-2\% lower range

\text{percentage of agreed}+\2% upper range

60\%-2\% to 60\%+2\% that is 58% to 62 %.

The expected population that wants flexible working hours in ranging from 58% to 62 %.

3 0
4 years ago
What type of pipe wrenches are designed for turning and holding where marring is not objectionable?
galina1969 [7]
The type of pipe wrenches which are designed to turn and hold where marring is not objectionable is known as the chain wrench.<span> It has two serrated which adjust and grip the pipe. </span>
5 0
4 years ago
1. After a rabbit population reaches the carrying capacity of its habitat, what will most likely happen to
kifflom [539]
C) alternately increase and decrease
6 0
3 years ago
Other questions:
  • What is the primary outgoing radiation put off by the sun?
    12·1 answer
  • A glass plate (n = 1.64) is covered with a thin, uniform layer of oil (n = 1.27). A light beam of variable wavelength from air i
    12·1 answer
  • Gravity has traditionally been defined as a force of attraction between things that have what
    12·1 answer
  • Your car is initially at rest when you hit that gas and the car begins to accelerate. The forward force of the car is 5630 N whi
    14·1 answer
  • HELP PLS i need this right now
    9·1 answer
  • Which statement describes the endothermic reaction by this graph?
    13·2 answers
  • Can aurora be found in other planets?
    5·2 answers
  • electromagnetic waves of wavelengths 1,34nm are emitted. how much energy do photons of this light have​
    12·1 answer
  • What is the gravitational field strength
    9·2 answers
  • A 25. 00 ml sample of acetic acid containing phenolphthalein indicator is titrated with 0. 1067 m naoh. The solution changes col
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!