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
Elden [556K]
3 years ago
5

A machine can never be 100% efficient because some work is always lost due to .

Physics
2 answers:
konstantin123 [22]3 years ago
6 0

Efficiency of machine is defined by

\eta = \frac{W_{output}}{Q_{input}}

here we know that

W_{output} = output useful work

Q_{input} = input energy

Now here if we obtain output work same as input thermal energy then it is 100% efficient

but this is only possible when we have no energy loss while it is not possible due to many reasons

one of the main cause of energy loss is friction

So when machine working there must be friction between its working parts due to which out input energy is lost in different parts and hence we can never be 100% efficient machine.

So here main reason is FRICTIONAL LOSS

klasskru [66]3 years ago
5 0
Friction
Hope it helped
You might be interested in
PLSLPSLLPSLPSLPS HELP I ONLY HAVE 5 MINS PLEASE
UkoKoshka [18]

Answer:

0.19m/s²

Explanation:

Initial velocity(u) = 50×1000/60×60

=13.88 m/s

Final velocity(v) = 36.5×1000/60×60

=10.13 m/s

Acceleration(a) = v-u/t

=10.13-13.88/19.5

a= -0.19m/s²

-a = 0.19m/s²

The magnitude of retar dation is 0.19m/s²

5 0
1 year ago
Read 2 more answers
The heliocentric theory suggests blank
astra-53 [7]

Answer:

Heliocentrism is the astronomical model in which the Earth and planets revolve around the Sun at the center of the Universe.

Explanation:

4 0
2 years ago
A car speeds up from 12.0 m/s to 16.0 m/s in 8.00s what is the acceleration
Lerok [7]

Answer:

0.5m/s²

Explanation:

acceleration =v-u/t

=(16-12)/8

=4/8

acceleration =0.5m/s²

7 0
2 years ago
Read 2 more answers
Eroded heavy minerals settle from moving water what forms from this
vladimir1956 [14]
Rocks- Mountains.....
6 0
3 years ago
Kinetic energy varies jointly as the mass and the square of the velocity. A mass of 1515 grams and velocity of 77 centimeters pe
Alexus [3.1K]

Answer:

The second kinetic energy is 162 J.

Explanation:

Given that,

Mass, m_1=15\ g

Velocity, v_1=7\ cm/s

Kinetic energy, K_1=147\ ergs

Mass, m_2=10\ g

Velocity, v_2=9\ cm/s

We need to find kinetic energy K_2. Kinetic energy is given by :

K=\dfrac{1}{2}mv^2

So,

\dfrac{K_1}{K_2}=\dfrac{m_1}{m_2}\times \dfrac{v_1^2}{v_2^2}\\\\K_2=\dfrac{K_1}{\dfrac{m_1}{m_2}\times \dfrac{v_1^2}{v_2^2}}\\\\K_2=\dfrac{147}{\dfrac{15}{10}\times \dfrac{7^2}{9^2}}\\\\K_2=162\ J

So, the second kinetic energy is 162 J.

4 0
3 years ago
Other questions:
  • What is the name for all the electromagnetic waves that exist
    9·1 answer
  • The mountains on the Moon were formed by what process?
    14·1 answer
  • A copper wire has a circular cross section with a radius of 1.00 mm. (a) If the wire carries a current of 2.80 A, find the drift
    7·1 answer
  • CAN SOMEBODY PLEASE HELP ME! i need help and i wanna pass
    11·1 answer
  • During the spin cycle of your clothes washer, the tub rotates at a steady angular velocity of 31.7 rad/s. Find the angular displ
    13·1 answer
  • I NEED HELP ASAP!!! 100 points if you answer these 7 questions:
    6·1 answer
  • I need helpppppp asap
    6·1 answer
  • Calcular la densidad de un trozo de hierro cuya masa es 110 g<br>y ocupa un volumen de 13.99 cm?.​
    14·1 answer
  • 9. Electron travelling though two horizontal plates
    9·1 answer
  • A 375-pound concrete cylinder has a base area of 144 square inches. with the cylinder resting on its base, the pressure exerted
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!