subject
Physics, 22.06.2019 21:00 brittneys55

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%

Answers

ansver
Answer from: mathk3

b. 20%

Explanation:

Efficiency of an engine is a ratio in percentage of the work done to the energy intake of the engine.

η=(Q₁-Q₂)/Q₁×100%

η is efficiency, Q₁ is the energy intake, Q₂ is energy wasted.

The information provided is:

Energy intake = 400 J

Work done = 80 J = (400-320) =Q₁-Q₂

Energy wasted =320 J

η= 80/400×100%

=20%

ansver
Answer from: mem8163

B.20 %

Explanation:

ansver
Answer from: Quest

i would like to make dinner for my mom, dad, and sister

ansver
Answer from: Quest

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

Other questions on the subject: Physics

image
Physics, 21.06.2019 23:30, 1031kylepoe03
Acoil formed by wrapping 80 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 28.0° with the direction of the field. when the magnetic field is increased uniformly from 200 µt to 600 µt in 0.400 as, an emf of magnitude 80.0 mv is induced in the coil. what is the total length of the wire?
Answers: 3
image
Physics, 22.06.2019 00:20, thedocgalloway
You have been consulted by the mobile phone company hookup about a new augmented reality product called “brows”. they want to develop an alternative to google glasses, which, you recall, is a proposed new product which plans to superimpose a whole range of wireless google services over the user’s ordinary vision of the world. these appear in little circles and ovals, and let you phone people, take photographs, navigate across cities and inside buildings, find shops and update your social media. brows would do this too, but not be limited to special google services. the user would wear a small cylinder-shaped device designed to fit on top of their existing eyewear (glasses or sunglasses). it would project a reversed image onto the inside of the lenses, the reflection of which would be in focus for the user. instead of voice control, the user would control the device by eye and neck movements, which the device would track. the device would connect via bluetooth to the user’s phone, which would supply most of the computing power and wireless connectivity. hookup also wants to know what existing services would be most in demand, and which would not work well with brows. using your knowledge of augmented reality, wearable technology and interface design, is the project feasible? if not, why not? if feasible, how could the product need to be modified for a better experience?
Answers: 2
image
Physics, 22.06.2019 05:10, allisondelp6
Aa ’s at a of 25 oc at ais . ataof 10 kw, by toat 14, kj/.of .
Answers: 1
image
Physics, 22.06.2019 10:30, arigar
Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.
Answers: 3
You know the right answer?
What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking i...

Questions in other subjects:

Questions on the website: 13569777