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
Stolb23 [73]
3 years ago
11

một động cơ nhiệt khi hoạt động nhiệt lượng mà nó nhận vào gấp bốn lần công mà nó thực hiện. Hiệu suất của động cơ là?

Physics
1 answer:
OlgaM077 [116]3 years ago
6 0

\frac{1}{4}  = 0.25 = 25\%

You might be interested in
Pls help meeee!!! will mark brainliest!!​
Vitek1552 [10]

Answer:

water

is missing in above equation

hope it helps

5 0
3 years ago
A 0.0780 kg lemming runs off a
kotegsom [21]

Answer:

5.01 J

Explanation:

Info given:

mass (m) = 0.0780kg

height (h) = 5.36m

velocity (v) = 4.84 m/s

gravity (g) = 9.81m/s^2

1. First, solve for Kinetic energy (KE)

KE = 1/2mv^2

1/2(0.0780kg)(4.84m/s)^2 = 0.91 J

so KE = 0.91 J

2. Next, solve for Potential energy (PE)

PE = mgh

(0.0780kg)(9.81m/s^2)(5.36m) = 4.10 J

so PE = 4.10 J

3. Mechanical Energy , E = KE + PE

Plug in values for KE and PE

KE + PE = 0.91J + 4.10 J = 5.01 J

4 0
3 years ago
A train travels 77 kilometers in 1 hour, and the 66 kilometers in 1 hour. What is the average speed?
Kipish [7]

Average speed = (total distance covered) / (time to cover the distance)

Total distance = (77km + 66km) = 143 kilometers

Time to cover the distance = 2 hours

Average speed = (143 km) / (2 hours) =  71.5 km per hour
6 0
3 years ago
Which of these BEST describes the term ecliptic? A. the circle where "Earth meets the sky" B. the change in azimuth and altitude
jeyben [28]
I'll say B ....hope that helps...
4 0
3 years ago
Read 2 more answers
A man, holding a weight in each hand, stands at the center of a horizontal frictionless rotating turntable. The effect of the we
Alex_Xolod [135]

Answer:

 w = 2w₀     the angular velocity of man doubles

Explanation:

In this exercise, releasing the weights reduces the moment of inertia

       I= I₀ / 2

Therefore, since the platform system plus man is isolated, the kinetic moment must be conserved

         L₀ = L

       I₀ w₀ = I w

       I₀ w₀ = I₀ / 2 w

       w = 2w₀

therefore the angular velocity of man doubles

7 0
3 years ago
Other questions:
  • Astronauts experience weightlessness because they are in?? what
    13·2 answers
  • can someone please answer my last question I posted? On my last post? My hw is due tomorrow and I’m confused.
    8·1 answer
  • Clouds of gas and dust as well as new star formation are typically seen in __________galaxy
    7·1 answer
  • Which equation represents a neutralization reaction?
    10·1 answer
  • Hey girls and guys.. I AM TAKING MY FINAL RN IN CLASS!! I NEED HELP AND WUICKLY
    15·1 answer
  • As the temperature of a sample of gas decreases, the kinetic energy of the particles _____.
    14·1 answer
  • Which main body system is responsible for breaking down food from energy?
    5·1 answer
  • List three examples of a skillets (cooking utensil) basic use.
    11·2 answers
  • Los estudiantes de la clase del Sr. Malio trabajaron en una investigación para medir el tiempo que le tomó al automóvil de energ
    7·1 answer
  • Which action has more power
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!