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Ludmilka [50]
3 years ago
6

The efficiency of a squeaky pulley system is 73 percent. The pulleys are used to raise a mass to a certain height. What force is

exerted on the machine if a rope is pulled 18.0 m in order to raise a 58 kg mass a height of 3.0 m
Physics
1 answer:
Mashutka [201]3 years ago
8 0

Answer:

129.9 m

Explanation:

Efficiency is the ratio of work output to work input, expressed as a percentage.

Efficiency= \frac {W_{out}}{W_{in}}

We know that work= mgh hence to get the work input

W_{in}= \frac {58\times 9.81\times 3}{0.73}=2338.273973 J

Work done by applied force=Fd

Fd=2338.273973 J

we have d as 18 m hence F=\frac {2338.273973 J}{18}=129.9041096 m\approx 129.9 m

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Answer:

The correct answer is c. More total rainfall from a slower moving storm.

When the the forward speed of the hurricanes and tropical storms slows down they tend to increase the rainfall. Because of the slow movement the storm can be for few days over a given region and produce rainfall without stopping, thus create major flooding, pilling up of the coastal water, and produce persistent strong winds even though they have decreased in their forward speed.

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4 years ago
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A box sits at rest on a rough 33° inclined plane. Draw the free-body diagram, showing all the forces
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(a) The free body of all the forces include, frictional force, weight of the box acting perpendicular and another acting parallel to the plane.

(b) When the box is sliding down, the frictional force acts towards the right.

(c) When the box slides up, the direction of the frictional force changes, it acts towards the left.

<h3>Free body diagram</h3>

The free body diagram of all the forces on the box is obtained by noting the upward force and downward forces on the box as shown below;

                      /  W2

                    Ф → Ff

                    ↓W1

where;

  • Ff is the frictional force resisting the down motion of the box
  • W1 is the perpendicular component of the box weight = Wcos(33)
  • W2 is the parallel component of the box weight = Wsin(33)

(b) When the box is sliding down, the frictional force acts towards the right.

(c) When the box slides up, the direction of the frictional force changes, it acts towards the left.

Learn more about free body diagram of inclined objects here: brainly.com/question/4176810

8 0
2 years ago
How many watt hours will 3-155amp hour 12 volt batteries wired in a parallel configuration produce?
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Answer:

B 5580 W•hr

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Explanation:

<em>Position is the location of the object (whether it's a person, a ball, or a particle) at a given moment in time.</em>

<em>Displacement is the difference in the object's position from one time to another.</em>

<em>Distance is the total amount the object has traveled in a certain period of time.</em>

<em />

<em>I hope this helps!</em>

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What does this circle graph tell you about water on Earth? (2 points)
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ocean covers 71 percent of the earth

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