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
Most restaurants serve suggested serving sizes for one person.
sweet-ann [11.9K]
I'm not really sure what you are asking. I will try though. The main serving sizes as you know are:
1.Small
2.Medium
3.Large
To me, it depends on the person that is ordering the food, and what size they want it to come in. I hope that helped.
7 0
4 years ago
Read 2 more answers
A 91.5 kg football player running east at 2.73 m/s tackles a 63.5 kg player running east at 3.09 m/s. what is their velocity aft
pentagon [3]

Answer:

2.877 m/s

Explanation:

According to the laws of conservation of linear momentum,

the momentum of the moving objects before impact is equal to the momentum of the objects after impact (Assuming no external forces were applied)

Let both players are tackled and moving in V velocity

  • M and m - masses of the players
  • U and  u -  velocities of them respectively (both velocities are towards east direction )

momentum before impact = momentum after impact

                          →MU + →mu  = →(M+ m )v

 91.5  * 2.73 + 63.5 * 3.09 =  (91.5 + 63.5) * V

                                       →V = 2.877 m/s (To East)

3 0
3 years ago
Read 2 more answers
Which waves in the electromagnetic spectrum are considered high energy waves?. . A.radio waves and microwaves. B.X–rays and gam
Sergeu [11.5K]
The answer is B. X-rays and gamma rays. The electromagnetic spectrum consists of all types of electromagnetic radiation. The EM spectrum is arranged from the longest wavelength with the lowest frequency and lowest energy which are the radio waves and microwaves to the shortest wavelength with the highest frequency and highest energy which are the x-rays and gamma rays. Visible light that can be seen by a humans is a small portion in between the ultraviolet and infrared rays.
3 0
4 years ago
Read 2 more answers
A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -52 µc. how many excess electrons does this pe
LenKa [72]
Using q=1.60217662 E-19 C we get:
\frac{52 \times 10^-^6}{1.60217662 \times 10^-^1^9}=3.24558 \times 10^1^4 electrons
Then using 9.10938356E-31 kg as the mass, we get
 (3.24558 \times 10^1^4)(9.10938356\times 10^-^3^1)=2.95653\times 10^-^1^6kg
6 0
3 years ago
Read 2 more answers
You are a project manager for a manufacturing company. One of the machine parts on the assembly line is a thin, uniform rod that
ra1l [238]

Answer:

a) I=0.012\ kg.m^2

b) I=0.012\ kg.m^2

Explanation:

Given that:

  • mass of rod, m=0.4\ kg
  • length of the rod, l=0.6\ kg

<u>(a)</u>

<u>Moment of inertia of rod about its center and perpendicular to the rod is given as:</u>

I=\frac{1}{12} m.l^2

I=\frac{1}{12} 0.4\times 0.6^2

I=0.012\ kg.m^2

(b)

<u>Moment of inertia on bending the rod to V-shape of 60 degree angle and axis being perpendicular to the plane of V at the vertex.</u>

<em>We treat it as two rod with axis of rotation at the end and perpendicular to the plane of rotation. </em>

<em>So, the mass and the length of the rod will become half of initial value.</em>

I=I_1+I_2

I=\frac{1}{3} \frac{m}{2} (\frac{l}{2})^2 +\frac{1}{3} \frac{m}{2} (\frac{l}{2})^2

I=2[ \frac{1}{3}\times 0.2\times 0.3^2]

I=0.012\ kg.m^2

7 0
3 years ago
Other questions:
  • A car initially moving at 9 m/s begins accelerating at its maximum acceleration of 4 m/s2. if the car maintains this acceleratio
    15·1 answer
  • Find the potential 1.24 cm from a proton. the coulomb constant is 8.9876 × 109 n m2 /c 2 and the elemental charge is 1.602 × 10−
    14·1 answer
  • (FLUID MECHANICS)
    11·1 answer
  • What does an alpha particle consist of?
    9·1 answer
  • What does the zeroth law of thermodynamics allow us to define?
    6·2 answers
  • In freefall, heavier objects fall with a greater acceleration than lighter objects.
    10·2 answers
  • Someone please help me
    5·1 answer
  • a desktop computer and monitor together draw about 2 A of current they plug into a wall outlet that is 120 V what is the Resista
    11·1 answer
  • Rose and Joel’s children recently moved out to live independently. The couple has been missing their kids and is experiencing th
    11·1 answer
  • A ray of light strikes a boundary between two transparent materials, and there is no transmitted ray, as shown in the figure. Wh
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!