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
hoa [83]
4 years ago
7

A heat engine absorbs 64 kcal of heateach cycle and exhausts 42 kcal. Calculate the efficiency of eachcycle. (Page Ref: Sec. 15.

5)a. 34%b. 66%c. 50%d. 150%
Physics
1 answer:
Dahasolnce [82]4 years ago
4 0

Answer:

The efficiency of each cycle of a heat engine is 30 %.                                                            

Explanation:

Given that,

Heat absorbed by a heat engine, Q = 64 kcal

Heat exhaust by a heat engine, Q' = 42 kcal

We need to find the efficiency of each cycle. The efficiency of heat engine is defined as the ratio of work output to the energy supplied. It is given by :

\eta=1-\dfrac{Q'}{Q}

\eta=1-\dfrac{42}{64}

\eta=0.3

or

\eta=30\%

So, the efficiency of each cycle of a heat engine is 30 %. Hence, this is the required solution.

You might be interested in
Vector a cross b whole square<br><br>​
skad [1K]

Answer:

Kriss go Brrrrrrrrrrr

Explanation:

4 0
3 years ago
You are packing for a trip to another star. During the journey, you will be traveling at 0.99c. You are trying to decide whether
Elenna [48]

Answer:

Do neither of these things ( c )

Explanation:

For length contraction : Is calculated considering the observer moving at a speed that is relative the object at rest applying this formula

L = (l) \sqrt{1 -\frac{v^{2} }{c^{2} } }

where l = Measured distance from object at rest, L =  contracted measured in relation to the observer , v = speed of clock , c = speed of light

you will do neither of these things because before you can make such decisions who have to view the object in this case yourself from a different frame from where you are currently are, if not your length and width will not change hence you can't make such conclusions/decisions .

7 0
3 years ago
What are some important factors to consider when choosing a warm-up before your workout?
TEA [102]

<u>Answer:</u>

Prior to exercise, a proper warm-up of 10-15 minutes is extremely important to avoid injuries.

  1. Don't go too hard in the beginning and boost your activity level slowly. A good indication of a proper warm-up is that you feel sweat on your body parts.
  2. Don't overstretch right in the beginning as it can cause sore in your muscles and joints or stress fractures.
  3. Take a break if you feel sick or fatigues and use other drinks along with water to replace electrolytes and body fluids.  
6 0
4 years ago
Read 2 more answers
Through which of these media do sound waves travel most slowly? A.iron. B.Wood. C.Water. D.Cold Air
EleoNora [17]
The answer should be D) Cold air because even though its true sound can travel through all types of matter, air which is a gas, can travel but it travels SLOWLY while sound travels quickly in SOLIDS.
5 0
4 years ago
Podrian ayudarme? Llevo dias intentando pero no se como 1. el profesor no explico
Paraphin [41]
You have to upload this in the area of mathematicians..!
8 0
3 years ago
Other questions:
  • A body travels 80 meters in 8 seconds <br> at a steady speed calculate it's average speed<br>​
    5·1 answer
  • A hobby rocket reaches a height of 72.3 meters and lands 111 meters from the launch point
    14·1 answer
  • A bike travels 30m/s for 3 seconds. How far did it travel?
    14·1 answer
  • What is the wavelength in nm of a light whose first order bright band forms a
    8·1 answer
  • The Doppler effect causes sounds moving toward an observer to sound _____.
    7·2 answers
  • Suggest at least two reagents other than sodium borohydride that could be used to carry out the reduction of 9-fluorenone to 9-h
    6·1 answer
  • In one hour, coal supplies 500 000 J of energy. The energy amounts to 380 000 J. How much useful energy is produced in one hour?
    12·1 answer
  • A rod of 3.0-m length and a square (2.0 mm X 2.0 mm) cross section is made of a material with a resistivitYof 6.0 X 10-8 Ω m. If
    5·2 answers
  • PLS HELP ASAP (no links)
    13·2 answers
  • The ability of the brain to change in response to experience is called____
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!