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
kow [346]
2 years ago
15

Hey help me plzzzzz i will mark brainliest​

Physics
1 answer:
vodomira [7]2 years ago
7 0

Answer:

The answer to your question is given below.

Explanation:

Mechanical advantage (MA) = Load (L)/Effort (E)

MA = L/E

Velocity ratio (VR) = Distance moved by load (l) / Distance moved by effort (e)

VR = l/e

Efficiency = work done by machine (Wd) /work put into the machine (Wp) x 100

Efficiency = Wd/Wp x100

Recall:

Work = Force x distance

Therefore,

Work done by machine (wd) = load (L) x distance (l)

Wd = L x l

Work put into the machine (Wp) = effort (E) x distance (e)

Wp = E x e

Note: the load and effort are measured in Newton (N), while the distance is measured in metre (m)

Efficiency = Wd/Wp x100

Efficiency = (L x l) / (E x e) x 100

Rearrange

Efficiency = L/E ÷ l/e x 100

But:

MA = L/E

VR = l/e

Therefore,

Efficiency = L/E ÷ l/e x 100

Efficiency = MA ÷ VR x 100

Efficiency = MA / VR x 100

You might be interested in
Which metal works best to displace hydrogens from acid?
egoroff_w [7]
Lead is answer i think
5 0
3 years ago
Part A Determine the absolute pressure on the bottom of a swimming pool 30.0 m by 8.7 m whose uniform depth is 1.8 m . Express y
Sphinxa [80]

Answer:

17.66 kPa

Explanation:

The volume of water in the swimming pool is the product of its dimensions

V = 30 * 8.7 * 1.8 = 469.8 cubic meters

Let water density \rho = 1000 kg/m^3, and g = 9.81 m/s2 we can calculate the total weight of water in the swimming pool

W = mg = \rho V g = 1000 * 469.8 * 9.81 = 4608738 N

The area of the bottom

A = 30 * 8.7 = 261 square meters

Therefore the pressure is its force over unit area

P = F/A = 4608738  / 261 = 17658 N/m^2 or 17.66 kPa

7 0
3 years ago
Consider a magnetic force acting on an electric charge in a uniform magnetic field. Which of the following statements are true?
CaHeK987 [17]

Answer:

Pushing magma up through the interior of earth

Explanation:

5 0
3 years ago
Anti-reflective coatings on lenses use thin-film interference to eliminate the reflection of a particular color. Suppose a glass
Sidana [21]

Answer with Explanation:

We are given that

n_g=1.55

n_f=1.35

\lambda=521 nm=521\times 10^{-9} m

1 nm=10^{-9} m

a.We have to find the expression for  the minimum thickness the film can have ,t.

Condition for destructive interference

2nt=(m+\frac{1}{2})\lambda

t=\frac{(m+\frac{1}{2})\lambda}{2n}

For minimum thickness m=0

Then, t=\frac{\lambda}{4n}

b.Substitute the values

t=\frac{521\times 10^{-9}}{4\times 1.35}=96.5nm

7 0
3 years ago
Explain Bernoulli's Principle, air pressure, Down Wash, Angle of Attack, and vortices simply.
lord [1]

just listen I am also confused in this question if you get the answer so please just tell me also

3 0
3 years ago
Other questions:
  • Which statement is true?
    12·1 answer
  • The age of the universe is around 100,000,000,000,000,000s. A top quark has a lifetime of roughly 0.000000000000000000000001s. W
    7·1 answer
  • What is the formula for calculating the efficiency of a heat engine?
    8·2 answers
  • Which si unit whould be most appropriate for describing the length of a shoe?
    9·1 answer
  • Acceleration is defined as the rate of change for which of the following?
    14·2 answers
  • Would you expect the two species to compete for food on this island? Support your answer with an explanation.
    13·2 answers
  • Help for brainliest!
    14·1 answer
  • What is the momentum of an object weighing 7.5 kg moving at 1.6 m/s?
    9·2 answers
  • A sled that has a mass of 8 kg is pulled at a 50 degree angle with a force of 20 N. The force of friction acting on the sled is
    9·1 answer
  • Particle dislodgement in the filtration process is generally undesirable, except during?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!