A machine lifts a 1000 N object 40 meters in 15 seconds. How much work is done by the machine

Answer:

Reduce its weight

Explanation:

For an object on a flat surface, the maximum force of friction experienced by the object is given by:

[tex]F = \mu W[/tex]

where

[tex]\mu[/tex] is the coefficient of friction

W is the weight of the object

As we can see from the formula, there are two ways of reducing the  friction:

- Decreasing [tex]\mu[/tex] --> this coefficient depends on the material and on the roughness of the surface, so this can be changed by changing the properties of the surface

- Decreasing W, the weight --> this can be done by reducing the mass of the object

Answer:

The most reasonable weight for an average adult is 603 A ⇒ last answer

Explanation:

The weight of an adult = gm, where m is the mass and g is the  

gravitational acceleration

The gravitational acceleration is approximately 9.8 m/s

We need to find the most reasonable weight in units of newtons for an

average adult

The weight is 120 N

w = mg

120 = m(9.8)

Divide both sides by 9.8

m = 12.24 kg

The weight is 27 N

27 = m(9.8)

Divide both sides by 9.8

m = 2.76 kg

The weight is 1000 N

1000 = m(9.8)

Divide both sides by 9.8

m = 102.1 kg

The weight is 603 N

603 = m(9.8)

Divide both sides by 9.8

m = 61.5 kg

From the all the answers above the most suitable mass of an adult

is 61.5 kg, then the most reasonable weight for an average adult is

603 N

The most reasonable weight for an average adult is 603 A

Answer:

false

Explanation:

A mixture of soil does not have the same chemical composition through out.

at some point we begins to see different chemical composition

Answer:

[tex]-5.0 m/s^2[/tex]

Explanation:

Missing question:

What is the object's acceleration?

Solution:

The acceleration of an object is given by

[tex]a=\frac{v-u}{t}[/tex]

where

v is the final velocity

u is the initial velocity

t is the time taken for the change in velocity

For the object in this problem,

u = +25 m/s

v = +15 m/s

t = 2.0 s

Substituting,

[tex]a=\frac{15-25}{2}=-5.0 m/s^2[/tex]

And the acceleration is negative because its direction is opposite to that of the velocity.

Difference between Eutrophication and Artificial Eutrophication

Eutrophication is defined as the process where there is excessive nutrients available in a water medium. There are two types of eutrophication process called as man-made eutrophication or artificial eutrophication and natural eutrophication.

As the name implies natural eutrophication occurs naturally without any external factor. Whereas artifical eutrophication is stimulated by external factor as it is forced by human activity. Eutrophication is imposed artificially so that to maintain a proper state of equilibrium is to reduce water pollution.

Eutrophication refers to the natural process of nutrient enrichment in bodies of water, while artificial eutrophication is the accelerated process caused by human activities.

1) Cause: Eutrophication occurs naturally from sources like sediment erosion and decaying organic matter. Artificial eutrophication is caused by human activities such as agriculture, sewage, and industrial discharges.

2) Rate and Timescale: Eutrophication is a slow, natural process occurring over centuries or longer. Artificial eutrophication is rapid and occurs within a shorter time frame.

3) Nutrient Sources: Eutrophication is driven by natural sources like weathering of rocks and soils. Artificial eutrophication is primarily caused by human sources such as agricultural runoff and sewage discharge.

4) Ecological Impact: Eutrophication can have ecological impacts, but artificial eutrophication often leads to more severe consequences like harmful algal blooms, oxygen depletion, and disruption of aquatic ecosystems.

5) Control and Prevention: Eutrophication is challenging to control as a natural process. Artificial eutrophication can be mitigated by implementing nutrient management practices, wastewater treatment, and land-use regulations.

In summary, eutrophication is the natural process of nutrient enrichment, while artificial eutrophication is the accelerated process caused by human activities, leading to more severe ecological impacts.

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Answer:

All of the above

Explanation:

because these are all senses of the body and therefore you're receiving signals from all of them all the time

Answer:

D. All of the above.

Explanation:

An observation is received directly or indirectly by all of the above. When observing things, you need to visually be able to see what is being observed, and be able to touch hear and even taste. This ensures that you can get the best out of the observation.

The concept of weight allows us to find the mass of each body, finding that the answer for the body with the greatest mass is:

Density is a connection used in many expressions of physics, it is defined by the relationship between the mass and the volume of the body.  

      ρ = [tex]\frac{m}{V}[/tex]

Where ρ is the density, m the plus and V the volume of the body

The specific weight is defined by the relationship between the weight of the body and its volume, it is a quantity that depends on the value of the acceleration due to the gravity of the place. Expression used in the English system of measurements

       γ = [tex]\frac{W}{V}[/tex]

From the previous expressions it is observed that the density and the specific weight are related

        γ = ρ g

The weight of the product of the mass of the body that is invariant by the value of the acceleration of gravity, whose value depends on the place of measurement.

             W = m g

             m = W / g

Where W is the weight, m ​​the mass and g the acceleration due to gravity

This exercise describes the values ​​in the following table

material     volume (cm³)     weight (lb)

  W                   10                     2

  X                  122                     3

  Y                    56                     1

  Z                     18                     7

They ask to find which body has the greatest mass.

In the English system, the measurement is the weight of the body, which is expressed in pounds, the mass measurement is not so common and its unit is the slug.

let's calculate

Material W

          m = 2/32

          m = 0.0625 slug

Material X

         m = 3/32

         m = 0.09375 slug

Material Y      

             m = 1/32

             m = 0.0312 slug

Material Z

             m = 7/32

             m = 0.125 slug

In conclusion, using the concept of weight, we can find the mass of each body, finding that the answer for the body with the greatest mass is:

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Answer:

D

Explanation:

Edge

Answer:

According to first law of motion, a body continues to be in state of rest or motion unless an unbalanced force acts on it.

When the bus stops, Jose feels a sudden forward motion. This is due to the inertia of motion. In the bus, Jose has same speed as the bus while sitting. When she gets and starts moving, the bus stops at the light. But due to the inertia of motion, Jose feels a sudden forward motion before she finally stops.

Answer:Physical changes involve states of matter and energy.

Explanation:

No new substance is created during a physical change, although the matter takes a different form. The size, shape, and color of matter may change. Physical changes occur when substances are mixed but don't chemically react.

Final answer:

A physical change is when matter changes its form or properties without changing its chemical identity, such as melting ice or evaporating water.

Explanation:

A physical change is a type of change in which the form of matter is altered but its identity remains the same. For example, when an ice cube melts, it goes from a solid to a liquid (Figure 1.2.3); this change alters its shape and allows it to flow, yet the chemical composition of water (H₂O) does not change. Another instance is when water vaporizes; the temperature and energy of water molecules increase leading to evaporation, turning liquid water into water vapor (H₂O (l) → H₂O (g)), without altering the molecular structure.

Sorting a mixture of pennies and nickels changes the arrangement of the coins without changing their properties. Similarly, tearing a piece of paper changes its shape and size, but it remains paper. These examples show that during a physical change, the arrangement of particles may change, but the mass, number of atoms, and number of molecules stay the same.

Well, to find velocity, you need to divide the change in position by the change in time. So on your graph, find two points. Find the change in position and time in those two points, these can be any two points on the graph. Then you can divide the change in position by the change in time. (I know this explanation is confusing so hopefully what I included below can help.)

Velocity =   x1 - x2  divided by t1 - t2

x1 = final position   x2 = initial position

t1 = final time          t2 = initial time

Hopefully this helps!

Answer:

6250 J

Explanation:

Work is the distance times the component of the force along that distance.

The horizontal component of the force is:

25 N × cos(60°) = 12.5 N

So the work done is:

W = (500 m) (12.5 N)

W = 6250 J

To calculate the work done by the man on the lawn mower, we use the formula Work = Force  imes Distance times cos( heta). The horizontal component of the force is determined and then multiplied by the distance to get a total work done of 6250 joules.

Calculating Work Done When Pushing a Lawn Mower

To calculate the work done on an object, you can use the formula Work (W) = Force (F) times Distance (d) times cos( heta), where  heta is the angle between the force and the direction of movement. For the man pushing the lawn mower, the force is 25 newtons, the distance is 500 meters, and the angle is 60 degrees with the horizontal.

First, calculate the horizontal component of the force:

Fhorizontal = F times cos(heta)

Fhorizontal = 25 N times cos(60°)

Fhorizontal = 25 N times 0.5

Fhorizontal = 12.5 N

Next, calculate the work done using the horizontal component of the force:

W = Fhorizontal times d

W = 12.5 N times 500 m

W = 6250 J (joules)

Therefore, the work done by the man on the lawn mower when pushing it 500 meters is 6250 joules.

Answer:

Gravitational force, Weak Nuclear force, Electromagnetic force and Strong Nuclear force. The weak and strong forces are effective only over a very short range and dominate only at the level of subatomic particles. Gravity and Electromagnetic force have infinite range.

Answer:Place the graduated cylinder on a flat surface and view the height of the liquid in the cylinder with your eyes directly level with the liquid. The liquid will tend to curve downward. This curve is called the meniscus. Always read the measurement at the bottom of the meniscus.

Explanation:

Answer:

People should show appreciation for what the speaker is saying.

Explanation:

Answer:

a) 6.46 seconds

b) 334 feet

c) Kathy: 103 ft/s; Stan: 89.6 ft/s

Explanation:

At constant acceleration:

x = x₀ + v₀ t + ½ at²

where x is final position,

x₀ is initial position,

v₀ is initial velocity,

a is acceleration,

and t is time.

For Kathy, x₀ = 0 ft, v₀ = 0 ft/s, a = 16 ft/s², and t = t.

For Stan, x₀ = 0 ft, v₀ = 0 ft/s, a = 12 ft/s², and t = t + 1.

Kathy:

x = 0 + (0) t + ½ (16) t²

x = 8t²

Stan:

x = 0 + (0) (t + 1) + ½ (12) (t + 1)²

x = 6 (t + 1)²

a) When Kathy overtakes Stan, they have the same position:

8t² = 6 (t + 1)²

8t² = 6 (t² + 2t + 1)

8t² = 6t² + 12t + 6

2t² − 12t − 6 = 0

t² − 6t − 3 = 0

Solving with quadratic formula (or complete the square):

t = [ -(-6) ± √((-6)² − 4(1)(-3)) ] / 2(1)

t = [ 6 ± √(36 + 12) ] / 2

t = (6 ± √48) / 2

t = (6 ± 4√3) / 2

t = 3 ± 2√3

Since t > 0, t = 3 + 2√3 ≈ 6.46 seconds.

b) Kathy's position when she overtakes Stan is:

x = 8t²

x = 8 (3 + 2√3)²

x ≈ 334 feet

c) To find the final velocities, we use:

v = at + v₀

For Kathy:

v = (16) (3 + 2√3) + 0

v ≈ 103 ft/s

For Stan:

v = (12) (3 + 2√3 + 1) + 0

v ≈ 89.6 ft/s

A loaf of bread weighs 1362 g. The weight in kilograms is 1.362 kg. The correct option is d.

The weight of a loaf of bread is 1362 grammes, or 1.362 kilogrammes. Since there are 1000 grammes in a kilogramme, you must divide the weight in grammes by 1000 to convert it to kilogrammes. So, 1.362 kg is the weight in kilogrammes.

The conversion choice "d. 1.362 kg" gives the right weight of the bread in kilogrammes, appropriately representing this conversion.

Thus, the correct option is d.

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Answer:

This equation, i = v/r, tells us that the current, i, flowing through a circuit is directly proportional to the voltage, v, and inversely proportional to the resistance, r. In other words, if we increase the voltage, then the current will increase.

HOPE THIS HELPED!!!!!!!!!!!!!!XDDDDDD

Answer:

The answer is increasing the distance between two objects decreases the gravitational force. which is C

The effect does distance have on the force of gravity is increasing the distance between two objects decreases the gravitational force. Therefore, option C is correct.

The gravitational force, which is what pushes mass-containing objects toward one another. We frequently consider the pull of gravity from the Earth. Your body is kept on the ground by this force. However, all mass-bearing objects are pulled toward one another by gravity.

Any two mass-containing objects are attracted to one another by the gravitational force. Because it consistently attempts to pull masses together rather than pushing them apart, the gravitational force is known as attractive.

According to legend, Isaac Newton developed the theory of gravitation around 1665 or 1666 after observing an apple fall and wondering why it fell straight down rather than sideways or even upward.

Thus, option C is correct.

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The second object at 106 km is approximately 1.03 times further than the first object at 103 km. For proper comparison, both distances should be in the same unit, after which simple arithmetic can reveal the relation between the two.

When comparing distances, it's essential to express both measurements in the same unit to clearly understand which is greater or by how much one is greater than the other. For example, if one object is 103 km away and a second object is 106 km away, we are actually comparing two distances that are already in the same unit, kilometers. In this case, 106 km is merely 3 km farther than 103 km; it is not a multiple times further. To establish a ratio of the greater distance to the lesser one, we can divide 106 by 103, which gives us approximately 1.0291262, meaning the second object is approximately 1.03 times further away than the first object, not a whole multiple times further.

For a better understanding, let's consider the examples given:

Therefore, it's important to compare distances thoughtfully, ensuring they are expressed in the same units to accurately determine the comparison.

Answer:

Explanation:

The other members of the study group will have different ideas and perspectives to their own, thus generating different ways of understanding a topic. When you study, you only have one vision, however, by doing it in company, your own knowledge is enriched and you can understand the concepts globally.

It is another advantage of studying in a group. Being alone, he turns around before sitting down to study, looking for excuses and wasting time. On the other hand, when having a study appointment, you must meet a schedule, taking advantage of the moment to just study. They will also encourage each other to continue studying. In short, you cannot postpone studies as you would if you were studying alone.

Joining a study group generally makes the act of studying a little less monotonous. You should try to put together a group with those who understand the subject and are responsible, and the ideal is to enjoy the entire study process in company.

Answer:

Look at things from a different angle.

Other members of the study group will have different views and viewpoints than they do, resulting in a variety of approaches to a topic. When you study, you only have one vision; but, when you do it in a group, your knowledge expands and you may grasp topics more broadly.

Motivation

Another benefit of studying in a group is this. He turns around before settling down to study because he is alone, looking for reasons and wasting time. When you have a study appointment, on the other hand, you must stick to a timetable and use the time to study. They will also motivate one another to keep learning. In other words, you won't be able to postpone your studies like you would if you were studying alone.

Explanation:

Answer:

solar nebula, the sun, planetesimals, inner planets, and last but not least outer planets

Answer:

1. Solar Nebula

2. The Sun

3. Planetesimals

4. Inner planets

5. Outer planets

Explanation:

A star is formed in a molecular cloud of gas and dust, mainly composed of hydrogen and helium. The Nebular Theory establishes, for the formation of the solar system, that the cloud starts to collapse under its own gravity when it receives a shock wave from a near event, for example, a supernova explosion. That results in the cloud breaking in small pieces, and those pieces constitute a possible future star.

Then it begins to accrete and rotate as a consequence of the angular momentum. In the center of that disk when it reaches the necessary temperature and pressure a protostar will born.

Around the star, in this case the Sun, fragments of dust combine until they get a meaningful size (planetesimals). According with chemical distribution on the disk of the future solar system, rocky and iron were closer to the Sun and gasses and ice were in the outer part of disk. That may explain why the inner planets are terrestrial and the outer planets are giant gasses.

Greetings!

The correct answer choice is Choice 4.

Why?

In a scientific experiment the only thing being changed is the independent variable. Everything else should stay the same.

In this experiment, the independent variable is the amount of sunlight each plant should receive. Here's a tip- when looking for and independent variable look for whats being changed on purpose.

Hope this helps!

~Fluerie

Answer:

55 min

Explanation:

The missing question is: how long does the trip take?

First of all, we need to find the initial distance covered by Dylan. In the first part, he rides for

[tex]t_1 = 20 min = \frac{1}{3}h[/tex]

at a speed of

v = 15 mph

therefore, the distance he covered is

[tex]d = v t_1 = (15)(\frac{1}{3})=5 mi[/tex]

Then Dylan stopped for a time of

[tex]t_2 = 5 min = \frac{5}{60}=\frac{1}{12}h[/tex]

Finally, on the way back, Dylan covered again this distance but travelling at a new speed of

v = 10 mph

So, the time he took is

[tex]t_3 = \frac{d}{v}=\frac{5}{10}=\frac{1}{2}h = 30 min[/tex]

So, the total time of the trip was

[tex]t=t_1 + t_2 + t_3 = 20 min + 5 min + 30 min = 55 min[/tex]

Dylan's bike ride involves displacement and average velocity. He ends up back at the starting point after riding a certain distance and direction with the wind and then against the wind, resulting in a final displacement of zero miles.

This question involves the concept of displacement and average velocity.

Dylan rides his bike east for 20 minutes at a speed of 15 mph. The distance he travels can be calculated by multiplying the speed by the time: (15 mph) x (20 min) = 300 miles. Since he rides in a straight line, his displacement is also 300 miles east.

After turning around and riding back, Dylan travels at a speed of 10 mph. In the opposite direction, his displacement will be the negative value of his initial displacement: -300 miles.

Overall, his final displacement is the sum of his initial displacement and his opposite displacement: 300 miles + (-300 miles) = 0 miles. This means that Dylan ends up back at the starting point, 48th Street.

Answer:

14.42km

Explanation:

Given that the car traveled 12km due north, then 8 km due west going from town A to B, this can be represented on x-y plane as ( vectors) 12 units up and the 8 units to the left .

In doing so , the magnitude of displacement will be the square-root of the sum of squares of the two vectors

Magnitude =[tex]\sqrt{12^2+8^2} \\\\=\sqrt{144+64} \\\\\\=\sqrt{208} \\\\\\=14.42km[/tex]

If a  car travels 12 kilometers due north and then 8 kilometers due west going from town A to town B. The magnitude of the displacement of a helicopter that flies in a straight line from town A to town B will be 14 km

Using this formula

Magnitude of the displacement=√North kilometers ²+West kilometers ²

Where:

North=12 kilometers

West=8 kilometers

Let plug in the formula

Magnitude of the displacement=√12²+8²

Magnitude of the displacement=√144+64

Magnitude of the displacement=√208

Magnitude of the displacement=14 km

Inconclusion If a  car travels 12 kilometers due north and then 8 kilometers due west going from town A to town B. The magnitude of the displacement of a helicopter that flies in a straight line from town A to town B will be 14km

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For this case we must do a conversion. By definition we have to:

1 inch equals 2.54 centimeters

1 day equals 24 hours.

So, we have:[tex]18 \frac {in} {day} * \frac {1} {24} \frac {day} {h} * \frac {2.54} {1} \frac {cm} {in} =[/tex]

Canceling units we have:

[tex]\frac {18 * 1 * 2.54} {24 * 1} \frac {cm} {h} =\\\frac {45.72} {24}\frac {cm} {h} =[/tex]

[tex]1,905 \frac {cm} {h}[/tex]

Answer:

[tex]1,905 \frac {cm} {h}[/tex]

Answer:

1.905cm

explanation:

Final answer:

Light exhibits wave-like properties, such as wavelength and frequency, as well as particle-like properties represented by photons, illustrating the wave-particle duality.

Explanation:

Light is characterized by its wave-like properties and particle-like properties, a concept known as wave-particle duality. As a wave, light is described by properties such as wavelength (the distance between consecutive peaks of the wave) and frequency (the number of wavelengths that pass a point in a given time).

Light's behavior as a particle is evident in phenomena like the photoelectric effect, where light is seen to consist of particles called photons.The combination of wave and particle properties provides a comprehensive framework for explaining the diverse behaviors observed in different experimental contexts.

Answer:

Electrical force

Explanation:

Of the options given, the electric force is the only force that acts at a distance, that is, it is not necessary for two objects to be in physical contact for there to be electric force between them (Another example of force acting at a distance is the force of gravity.).

Instead, forces such as the normal force, friction force, and applied force all need contact between objects to take effect.

For example if an object does not touch the surface the normal force is null.

Answer:

It is C on edge.

Explanation:

Because I just figured it out and got it right and because it says so in the link provided from the question.

Answer:

the answers is c

Explanation:

just did it on edge

Answer:Newton's second law is not sufficient to explain rocket's design or requirements it also involves momentum

Explanation:by solving some equations involving newton's second law and momentum we get this Ma=mv M is mass of rocket and m is mass of gases so a=mv/M so as the time passes mass of rocket decreases due to burning of fuel and acceleration a increases

A heavier rocket requires more force to accelerate. Newton's second law, sometimes written as a=F/m, states that the heavier an object, the more force is required to accelerate it.

It implies that the time rate of change of a momentum is equal in magnitude and direction to the force applied to it. A body's momentum is equal to the product of its mass and velocity.

The amount of force produced by a rocket engine is determined by the amount of rocket fuel burned and the rate at which gas escapes the rocket (second law).

The reaction, or motion, of the rocket is equal to and in the opposite direction of the engine's action, or force (third law).

To accelerate, a heavier rocket requires more force. Newton's second law, sometimes written as a=F/m, states that the more force required to accelerate an object, the heavier it is.

Thus, this way, it could be adjusted in the design to provide more acceleration as a greater force will result in a greater acceleration, so a greater force will accelerate a rocket more.

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