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
notka56 [123]
3 years ago
11

The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the

efficiency of the machine is 40, then the value of W is?
A. 28.0
B. 48.0N
C. 233.0N
D. 50.0N​

Physics
1 answer:
natta225 [31]3 years ago
5 0

Answer:

50 N

Explanation:

Efficiency of a machine can't be more than 1, so I assume you mean 40%.  (Remember, efficiency and mechanical advantage are not the same).

Efficiency is the ratio of work out of a system to the work in to the system.

e = Wout / Win

Work is force times distance, so:

e = (Fout × Dout) / (Fin × Din)

Rearranging:

Fin = (Fout × Dout) / (e × Din)

Fin = (Fout / e) × (Dout / Din)

Fin = (Fout / e) / (Din / Dout)

We know that e = 0.40, and Fout = 120 N.  Since there are 6 pulleys, we also know that Din/Dout = 6.

F = (120 N / 0.4) / 6

F = 50 N

You might be interested in
A vector always consits of
Kazeer [188]

Answer:

Size and Direction

Explanation:

8 0
3 years ago
Please help me with this question :
aalyn [17]

Answer:

  • 514.27 ( wavelength )

the color is green

  • 602.93 nm  ( orange color )

the observation is that there is a change of visible color

Explanation:

A) wavelength of visible light that is most strongly reflected from a point on a soap

refraction n = 1.33

wall thickness (t) = 290 nm

2nt = (2m +1 ) ∝/2 -----equation 1

note when m = 0

therefore ∝ =  4nt/ 1 = 4 * 1.33 * 290 = 1542.8nm we will discard this

when m = 1

equation 1 becomes

∝ = 4nt/3 =( 4 * 1.33 * 290) /  3 = 1542.8 / 3 = 514.27 ( wavelength )

the color is green

B) the wavelength when the wall thickness is 340 nm

∝ = 4nt / 2m +1

where m = 1

∝ = (4 * 1.33 * 340 ) / 3  = 1808.8 / 3 = 602.93 nm  ( orange color )

the observation is that there is a change of visible color

7 0
3 years ago
The weight of an object on a planet depends on not only its mass but also on its distance from the planest center. this table li
-BARSIC- [3]
Uranus is much much larger than Earth, so the distance from the planet's center is much much greater
6 0
3 years ago
If yall friend me ill give lots of points like this in the future
Ne4ueva [31]

Answer:

ok......................

3 0
3 years ago
Volume of an block is 5 cm3. If the density of the block is 250 g/cm3, what is the mass of the block ?​
9966 [12]

Answer:

1.25kg

Explanation:

Simply multiply volume and density together

4 0
3 years ago
Other questions:
  • The heating curve of an ice-water mixture that is slowly heated to 125°C contains three sloped and two level portions. What do t
    10·2 answers
  • What happens when an electron absorbs energy?
    6·1 answer
  • Representar las uniones interatomicas<br> a. kcl<br> b. ZnO<br> c. ZnBr2<br> d. BeI2
    7·1 answer
  • A pair of glasses is dropped from the top of a 42.0 meter high stadium. A pen is dropped from the same position 2.00 seconds lat
    8·1 answer
  • Why does lithostatic pressure increase more rapidly with depth than hydrostatic pressure?
    7·1 answer
  • Compared to the sun, a star whose spectrum peaks in the infrared is:
    6·1 answer
  • If an object is neutrally buoyant (does not sink or float) in fresh water, the same object placed into salt water wouldA sink.B
    9·1 answer
  • Understanding that if we say something unkind to someone else his or her
    13·1 answer
  • If a light source (such as a light bulb) appears white, then it must _________ all colors of light.
    15·1 answer
  • A motorcycle is moving at a constant speed of 40 km/h. How long does it take the motorcycle to travel a distance of 10 km
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!