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
butalik [34]
3 years ago
13

Which of the following describes the efficiency of real machines?

Physics
2 answers:
Mariulka [41]3 years ago
4 0

Are you sure! Becuase I dont want to get this one wrong!



Leokris [45]3 years ago
3 0
Choice-B is the true one.
You might be interested in
The resistance created by waves on a 120-m-long ship is tested in a channel using a model that is 4 m long Y Part A If the ship
DanielleElmas [232]

Answer:

V_m = 12.78 km/hr

Explanation:

given,

length of the ship = 120 m

length of model of the ship = 4 m

Speed at which the ship travels = 70 km/h

speed of model = ?

by using froude's law

  F_r = \dfrac{V}{\sqrt{L g}}

for dynamic similarities

  (\dfrac{V}{\sqrt{L g}})_P = (\dfrac{V}{\sqrt{L g}})_{model}

  (\dfrac{V_p}{\sqrt{L_p}}) = (\dfrac{V_m}{\sqrt{L_m}})

  (\dfrac{70}{\sqrt{120}}) = (\dfrac{V_m}{\sqrt{4}})

          V_m = 12.78 km/hr

hence, the velocity of model will be 12.78 km/h

6 0
3 years ago
How much work does it take to move a 50 μC charge<br> against a 12 V potential difference?
lukranit [14]
<span>work =V*Q =12*50*10^-6

The total work done will be equal to 

work = V.Q

which means 

w= 12 . 50.10^-6
Hence,
w= 0.0006 J</span>
8 0
2 years ago
A person walks 9 meters to the right and 8 meters to the left what's the distance and displacement​
nordsb [41]
The distance is 17 and the displacement is 1
5 0
2 years ago
Read 2 more answers
Do tides depend more on the strength of gravitational pull or on the difference in strengths? explain.
SSSSS [86.1K]
Tides are influenced by the force of gravity exerted by the earth, moon and the sun. The sun has a larger mass than the moon and as such has a greater gravitational pull on the earth. the moon however has greater influence over the tides because they are caused by the difference in gravity fields. This means that the moon is the dominant influence due to the fact that the fractional difference in its force across the earth is greater than that seen from the sun. 
8 0
2 years ago
Electronic configuration of. <br>1)Fe. <br>2)Fe++ <br>3)Fe+++​
mezya [45]

Answer:

The electronic configuration of Fe2+ is 1s2 2s2 2p6 3s2 3p6 3d6 and Fe3+ is 1s2 2s2 2p6 3s2 3p6 3d5. Fe2+ contains 2 fewer electrons compared to the electronic configuration of Fe.

7 0
3 years ago
Other questions:
  • If a stereo has a dial that changes the volume of sounds the stereo makes what is the dial doing
    14·2 answers
  • What happens during the main sequence stage of a star?
    8·1 answer
  • What was different about the fire Montag saw after leaving the river?
    7·1 answer
  • Name four factors that affect local, regional climates?
    5·2 answers
  • The electric field strength E 0 is measured at a perpendicular distance R from an infinitely large, thin sheet that contains a u
    7·1 answer
  • Help plsssssssssss I write it 100 time no one answer
    15·1 answer
  • Plz help me I'll mark you brainliest
    12·2 answers
  • .Which of the following scenarios correctly describes Newton's First Law?
    6·2 answers
  • A person with a gravitational force of 750 N is sitting in the centre of a hammock which is strung between two trees. The ropes
    11·1 answer
  • The relative highness or lowness of a sound is called ______. Multiple Choice pitch timbre dynamics octave
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!