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
Calculate the force of a particle with a net charge of 170 coulombs traveling at a speed of 135 meters/second perpendicular to t
amm1812

Answer:

F=1.14N j

Explanation:

The magnitude of the magnetic force over a charge in a constant magnetic field is given by the formula:

|\vec{F}|=|q\vec{v} \ X\ \vec{B}|=qvsin\theta  (|)

In this case v and B vectors are perpendicular between them. Furthermore the direction of the magnetic force is:

-i X k = +j

Finally, by replacing in (1) we obtain:

\vec{F}=(170C)(135\frac{m}{s})(5.0*10^{-5}T)=1.14N\ \hat{j}

hope this helps!

6 0
3 years ago
Read 2 more answers
Neurons that deliver sensory information from sensory receptors to the spinal cord are called __________.
morpeh [17]

Answer:

First Order Neurons

Explanation:

First Order Neurons

The main function of First Order Neurons is to deliver sensory information from sensory receptors to the spinal cord.

In Actual there are three orders of neurons, the first order neuron carry signals from periphery to the spinal chord, the second order neuron carry signal from from spinal chord to the thalamus. And the third order neurons carry signals to the primary sensory cortex.

5 0
3 years ago
Read 2 more answers
An artillery shell of mass 30 kg has a velocity of 250 m/s vertically upward. The shell explodes into two pieces; immediately af
olga_2 [115]

Answer:

9654.34 m

Explanation:

from conservation of momentum

$$\begin{aligned}30 \times 250 &=-10 \times 120+20 \times V \\20 V &=30 \times 250+10 * 120 \\V &=\frac{30 \times 250+10 \times 120}{20}=435 \mathrm{~m} / \mathrm{s}\end{aligned}$$

And from Conservation of Energy

\frac{1}{2} m v^{2}=m g h\\h=\frac{v^{2}}{2 g}\\h=\frac{(435(m/s))^{2}}{2 \times 9.8(m/s^{2} )}\\h=9654.34 (m)

7 0
2 years ago
What can result if an earthquake causes a sudden vertical change in the sea floor?
andrezito [222]
The answer is A, a tsunami.
5 0
3 years ago
Read 2 more answers
TRUE OR FALSE. when an object changed direction without changing its speed, it is not accelerating
tatyana61 [14]

Answer:

True.

Explanation:

The velocity vector is constant in magnitude but changing in direction. Because the speed is constant for such a motion, many students have the misconception that there is no acceleration. ... But the fact is that an accelerating object is an object that is changing its velocity.

3 0
3 years ago
Other questions:
  • A una distancia de 12.0 m dsde una fuente puntual, el nivel de intensidad es de 70dB. A que distancia desde la fuente el nivel d
    14·1 answer
  • In a perfect vacuum, light waves travel at 300,000 kilometers every second. When light waves travel through materials, such as a
    7·2 answers
  • What are the similarities in the 3 types of waves
    6·1 answer
  • Class II levers like ankles and wheelbarrows are useful because they provide mechanical advantage, by amplifying the input force
    14·1 answer
  • A ball is ejected to the right with an unknown horizontal velocity from the top of a pillar that is 50 meters in height. At the
    15·2 answers
  • 66 POINTS HELP PLS
    6·2 answers
  • Action and reacion forces are described by which of Newton's laws of motion?
    8·2 answers
  • Supposed an object is weighted with a spring balance, first in air then while totally immersed in water.The readings on the bala
    15·1 answer
  • Imagine using brainly LOL COULDNT BE ME XD
    9·2 answers
  • We can expect the force of friction to be greater for an object moving on a surface if the surfaces in contact are
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!