What magnitude force is required to give a helicopter of mass m an acceleration of 0. 10g upward?.

Answer:

time = 6.9 s

Explanation:

velocity of the plane v = 22.7 m/s

acceleration of the train a = -3.3 m/s^2

it finally comes to res, final velocity u = 0 m/s

time t = ?

using the equation

v = u + at

substituting, we have

0 = 22.7  + (-3.3)t

0 = 22.7 - 3.3t

3.3t = 22.7

t = 22.7/3.3 = 6.9 s

Answer:

yes

Explanation:

lick me

Answer:

An apple hanging on a tree is acted upon by two basic forces: 1) the downward force exerted by the gravity force and, 2) the upward force exerted by the tree limb. The downward gravity force is also know as "weight".

The two types of forces acting on the apple on the tree are gravitational force and pressure by the wind. The gravitational force acting on it experiences as its own weight.

Force is an external agent acting on a body to change its motion or to deform it. There are various kinds of force such as gravitational force, magnetic force, nuclear force etc.

Gravitational force is the force by which an object attracts other object into its center of mass. Earth gravitationally pull all objects in its surface to the ground.

The apple on the tree will experience a force of gravitation by the earth as well as the force exerted by the air currents passing through the region.

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The I-V (current-voltage) curve represents the relationship between the current flowing through a p-n junction and the voltage applied across it. To understand the relationship, let's first discuss the p-n junction and electron-hole interactions in each region.

A p-n junction is formed when a p-type semiconductor, which has an excess of positively charged "holes" due to doping with acceptor impurities, is joined with an n-type semiconductor, which has an excess of negatively charged electrons due to doping with donor impurities. At the interface between the p and n regions, electrons from the n-side and holes from the p-side diffuse and recombine, creating a region depleted of charge carriers called the depletion region.

Now, let's look at the electron-hole interaction in each region of the p-n junction:

1. N-region (N-side): In the n-region, there is an abundance of free electrons (negative charge carriers) and a negligible number of holes. When a voltage is applied in the forward bias direction (positive voltage at the p-side and negative voltage at the n-side), the free electrons in the n-region are pushed toward the junction. These electrons can easily move through the n-region, contributing to the current flow. The electron-hole interaction in this region involves electrons moving freely.

2. P-region (P-side): In the p-region, there is an abundance of holes (positive charge carriers) and a negligible number of free electrons. When a voltage is applied in the forward bias direction, the holes in the p-region are pushed toward the junction. These holes can easily move through the p-region, contributing to the current flow. The electron-hole interaction in this region involves holes moving freely.

3. Depletion region: The depletion region, which lies between the p and n regions, is depleted of free electrons and holes due to recombination. In this region, there is an electric field that acts to prevent the further movement of charge carriers. When a voltage is applied in the reverse bias direction (positive voltage at the n-side and negative voltage at the p-side), the electric field widens the depletion region, making it even more devoid of charge carriers. The electron-hole interaction in this region involves the separation of electrons and holes, preventing their movement.

Now, coming to the I-V curve, it shows the behavior of current flowing through the p-n junction for different applied voltages. Here's how the I-V curve relates to the p-n junction:

1. Forward Bias: When a positive voltage is applied at the p-side and a negative voltage at the n-side, the I-V curve shows a significant increase in current. This is because the forward bias voltage allows the majority charge carriers (electrons in the n-region and holes in the p-region) to move more easily across the junction, reducing the barrier for current flow.

2. Reverse Bias: When a positive voltage is applied at the n-side and a negative voltage at the p-side, the I-V curve shows very little current flow. In the reverse bias, the electric field widens the depletion region, creating a high resistance to current flow. Only a small reverse saturation current, which is due to minority carriers (minority electrons in the p-region and minority holes in the n-region), flows in this region.

Overall, the I-V curve of a p-n junction demonstrates the characteristic behavior of current flow in different bias conditions and provides valuable information about the electrical characteristics and performance of the p-n junction device.

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If the box is moving along the surface to the left with increasing speed, then we know that its velocity vector, v, must also be pointing to the left. This means that the arrow representing v should be pointing to the left in our diagram.

The box is experiencing an acceleration, a, which is causing its speed to increase. This acceleration vector, a, should be pointing in the same direction as the velocity vector, v, since they are both acting in the same direction. This means that the arrow representing a should also be pointing to the left in our diagram.

The best diagram to represent the velocity and acceleration vectors in this situation would show two arrows pointing to the left, one for v and one for a. It is important to note that the length of these arrows would not necessarily be equal, since the acceleration vector could be changing in magnitude as the box continues to speed up.

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Since the diagram above shows fossils and rock features, X is an intrusion that is younger than layers Y and Z. Therefore, the correct answer option is:  intrusion, younger than layers Y and Z.

In Science, a fossil can be defined as the mineral impression or remains of both living and non-living organisms that are generally considered to be prehistoric in nature.

Additionally, rock strata (layers) that are found in various parts of the world are usually unique and different from one another because they are all composed of distinct geological history of planet Earth, which are commonly referred to as fossils.

This ultimately implies that, fossils are ancient organisms such as plants and animals that were formed into rocks.

By critically observing the rock strata (layers) shown in the image attached above, we can reasonably infer and logically deduce that X would be classified as an intrusion and it is younger than rock layers Y and Z.

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A 40 kg crate is pulled at a constant velocity. The coefficient of kinetic friction is 0.5 and the crate moves 7 m . The amount of work done is 140 joule.

When an object is moved over a distance by an external force, at least a portion of that force must be applied in the direction of the displacement.

By multiplying the length of the path by the component of the force acting along the path, work can be calculated if the force is constant. The work W is equal to the force f times the distance d, or W = fd, to mathematically describe this idea.

The work is W = fd cos if the force is applied at an angle of to the displacement. Performing work on a body involves moving it in its entirety from one location to another as well as.

Therefore, A 40 kg crate is pulled at a constant velocity. The coefficient of kinetic friction is 0.5 and the crate moves 7 m . The amount of work done is 140 joule.

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The resulting changes will be:

1. Pressure head: 88 ft (or 26.82 m)

2. Effective stress: No change, assuming no other factors affect it

3. Fluid pressure: No change

4. Total stress: Decreased by the same amount as the effective stress

To calculate the effective stress in the aquifer, we need to subtract the fluid pressure from the total stress.

Given:

Pressure head in the aquifer = 100 ft (or 30.48 m)

The pressure head in the aquifer is directly proportional to the fluid pressure, which can be calculated using the formula:

Fluid pressure (P) = ρ * g * h

Where:

ρ = density of the fluid (water) = approximately 1000 kg/m³

g = acceleration due to gravity = 9.8 m/s²

h = pressure head

Fluid pressure = 1000 kg/m³ * 9.8 m/s² * 30.48 m ≈ 298,440 N/m² (or Pa)

The total stress in the aquifer is the sum of the fluid pressure and the effective stress. Therefore, the effective stress can be calculated by subtracting the fluid pressure from the total stress.

Now, let's consider the changes in the hydraulic head due to pumping:

Change in hydraulic head = -12 ft (or -3.66 m)

The resulting changes in each parameter will be as follows:

1. Pressure head:

The pressure head will be reduced by 12 ft, so the new pressure head will be 100 ft - 12 ft = 88 ft (or 26.82 m).

2. Fluid pressure:

The fluid pressure does not change, as it depends on the density of the fluid and the acceleration due to gravity, which remain constant.

3. Effective stress:

The effective stress can be calculated as the total stress minus the fluid pressure. Since the fluid pressure remains constant, the effective stress will also remain constant unless there are other factors affecting it.

4. Total stress:

The total stress is the sum of the fluid pressure and the effective stress. As mentioned earlier, the fluid pressure remains constant, so the total stress will decrease by the same amount as the effective stress, assuming no other factors affect the total stress.

Therefore, the resulting changes will be:

1. Pressure head: 88 ft (or 26.82 m)

2. Effective stress: No change, assuming no other factors affect it

3. Fluid pressure: No change

4. Total stress: Decreased by the same amount as the effective stress

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the acceleration when the velocity is 0 m/s is 6 m/s².

a) Find the velocity and acceleration as functions of t.The equation of motion of a particle is given as s = t³ - 3t, where s is in meters and t is in seconds. We can find the velocity and acceleration by differentiating the displacement equation with respect to time t:

Velocity, v(t) = s'(t) = (d/dt)(t³ - 3t)

                     = 3t² - 3

Acceleration, a(t) = v'(t)

                            = (d/dt)(3t² - 3)

                            = 6t

b) Find the acceleration after 35 seconds.

The equation for acceleration as a function of time t is a(t) = 6t.

Therefore, we need to evaluate the acceleration function at t = 35. Substituting t = 35 in the acceleration function, we get:a(35) = 6(35) = 210 m/s²c)

Find the acceleration when the velocity is 0.Since the velocity is zero, we can equate the velocity equation to zero and solve for the time:

0 = 3t² - 3t

⇒ 3t(t - 1) = 0

So, t = 0 s or t = 1 s.

However, we're interested in the acceleration when the velocity is zero.

Therefore, we differentiate the velocity function with respect to time to obtain the acceleration function and evaluate the acceleration function at t = 1 s.

Differentiating the velocity function, we get:a(t) = 6tTherefore, a(1) = 6(1) = 6 m/s²

Therefore, When the velocity is 0 m/s, the acceleration is 6 m/s2.

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Answer:

0 ms^-2

Explanation:

Acceleration is the change in velocity. If something is going at a constant velocity, the velocity is not changing. So, there is no acceleration.

When a car maintains a velocity of exactly 65 mph, it's acceleration​ is zero.

The acceleration is time rate of change of velocity.

When the velocity is not changing with respect to time, it is said to be an object moving with constant velocity.

At constant velocity, there is no acceleration.

Thus, when a car maintains a velocity of exactly 65 mph, it's acceleration​ is zero.

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Answer: C

Explanation:

The fusion pressure inside of the stars core creates an outward force acting on the star. This pressure is balanced by the inwards gravitational force that the core of the star is experiencing.

Answer:

dmakqkwnwj fddfgdddwsf

Answer: vegetable’s

Explanation: because they have nutrients

Meats and vegetables

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Answer: be cut in half

Explanation:

Because light moves through different media at varying speeds, there is refraction of light—or a shift in the direction of the light's passage.

When light waves cross the border between two materials with different densities, like air and glass, their speed changes. They alter direction as a result, which is referred as as refraction.

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Answer:

Biodiversity is the variety and variability of life on Earth. Biodiversity is typically a measure of variation at the genetic, species, and ecosystem level. Terrestrial biodiversity is usually greater near the equator, which is the result of the warm climate and high primary productivity.

Explanation:

hope it helped <3

According to Newton’s first law of motion, an object at rest will begin to move, when an unbalanced force acts upon it.

option B is the correct answer.

Newton's first law of motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will continue in motion with a constant velocity unless acted upon by an external force.

In other words, an object will maintain its state of motion (whether it is at rest or moving in a straight line at a constant speed) unless a force acts upon it.

Thus, according to Newton’s first law of motion, an object at rest will begin to move, when an unbalanced force acts upon it.

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Answer:

its B

Explanation:

1.  

Navigate to a search engine.

2.  

Form a question.

3.  

List the keywords.

4.  

Enter the keywords and press Enter.

The steps for conducting a basic search are put in the order below:

Step 1.  Navigate to a search engine.

Step 2.  Form a question.

Step 3.  List the keywords.

Step 4.  Enter the keywords and press Enter.

Basic research can be used to learn more about a particular issue; it might not produce an idea or a solution, but it can be used to develop theories and scientific understanding.

Fundamental information from basic research can be used to carry out applied research. Applied research is utilized to address relevant, concrete issues. Research into and examination of materials and sources with the goal of establishing facts and drawing new findings.

Therefore, the correct order is:

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The question is incomplete. Your most probably complete question is given below:

Form a question.

Enter the keywords and press Enter.

Navigate to a search engine.

List the keywords.

Answer:

energy divided by time taken

or current squared multiplied by resistance

Explanation:

An international language for communication, aid in organising and comprehending biodiversity, facilitation of research and recording, support for conservation efforts, addition to our understanding of evolution, and consideration of cultural variation are all provided by a system for naming and identifying organisms.

Having a system for identifying and naming organisms is important for several reasons:

Clear Communication: A standardized system of identification and naming allows scientists, researchers, and individuals to communicate clearly and effectively about specific organisms. It provides a common language and reference point, enabling accurate and unambiguous communication about a particular species.

Organization and Classification: The system of identification and naming helps in organizing and classifying the vast diversity of organisms. By assigning unique names to each species, scientists can categorize and group organisms based on their similarities and relationships, making it easier to study and understand the natural world.

Reference and Documentation: The naming system serves as a reference for documenting and recording information about different species. It allows researchers to maintain detailed records of their findings, observations, and studies, facilitating future research, collaboration, and the sharing of knowledge.

Species Conservation and Management: Accurate identification and naming of organisms are crucial for conservation efforts. It helps in identifying endangered or threatened species, monitoring population trends, and implementing appropriate conservation strategies. It also aids in tracking invasive species and managing ecosystems effectively.

Historical and Evolutionary Understanding: The system of naming organisms often reflects their evolutionary history and relationships. By examining the scientific names and taxonomic classifications, researchers can gain insights into the evolutionary patterns, shared ancestry, and evolutionary relationships among different species.

Cultural and Traditional Importance: Many organisms have local, traditional, or cultural names that hold significance in specific regions or communities. Having a standardized system allows for the integration of local names with scientific names, fostering cultural preservation and respecting indigenous knowledge and practices.

Therefore, a system for identifying and naming organisms provides a universal language for communication, aids in organizing and understanding biodiversity, facilitates research and documentation, supports conservation efforts, contributes to our understanding of evolution, and respects cultural diversity.

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The force that the spring exerts is = 1.31 N

The spring force in the spring depends on the spring's displacement and the force constant of the particular spring. The below expressions show the force that the spring exerts,

\(F=kx\)

Here, we are given,

k= The spring constant of a spring = 8.75 N/m.

x= The displacement of the string is = 0.150 m

Now, we replace the known values in the above equation, we can find :

\(F=kx\)

Or, \(F= 8.75 \times 0.150\)

Or, \(F= 1.3125 N\)

Or, F≈ 1.31 N

Now, from the above calculation we can conclude that the force that the spring exerts is 1.31 N.

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If you start with 1,000 grams of erbium-165, the time it  will take to have 125 grams of erbium-165 left in the sample is 20.8 hours.

option D is the correct answer.

Half life is the time that it takes for half of the original value of some amount of a radioactive element to decay.

If you start with 1,000 grams of erbium-165, the time it  will take to have 125 grams of erbium-165 left in the sample is calculated as follows;

1,000 ---------- 0 time

500 ----------- 10.4 hours

125 ------------- 20.8 hours

Thus, from the calculation done above, we can see that If you start with 1,000 grams of erbium-165, the time it  will take to have 125 grams of erbium-165 left in the sample is 20.8 hours.

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For a 1.00 m (100 cm) crumple zone, about 200 kN of deformation is needed in order to keep the passengers safest.

Crumple zones, also known as crush zones or crash zones, are structural safety features used in vehicles, primarily in automobiles, to extend the time before a change in velocity and consequently momentum results from the impact during a collision by means of a controlled deformation.

In recent years, they have also been added to trains and railcars. As the average force delivered to occupants is inversely proportional to the time over which it is applied, crumple zones are intended to extend the duration over which the overall force from the change in momentum is applied to a person.

The equation for the impulse here is:

F Δt = m Δv

where, v is the velocity and m is the mass.

The survival rate of dummy experiments shows about 90% for a 1 m crumple zone. Hence, a deformation of 200-300 kN is needed to keep the passengers safest.

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Answer:

Speed is a scalar quantity, that is, it is a number and indicates how fast (or slow) one travels at any given time.

Velocity is a vector quantity, this means that it has magnitude and direction, that is, how fast an object travels and its where its going (speed + the direction in which the object moves).

Acceleration is the ratio of the velocity change over the time interval in which this velocity change occurred. Acceleration as well as velocity is a vector quantity so it is made up of magnitude and direction.

The differences between these three quantities are important for the description of the movement. In the case of speed and velocity, its difference lies in the fact that velocity indicates the direction in which the movement is taking place (and speed is only a number), which in many physical phenomena the direction of movement is an important property. And the difference between acceleration and velocity is that acceleration instead of a velocity indicates a change in velocity (either in magnitude, direction or both), which tells us how fast a velocity will increase or decrease over time.

Answer:

If one plays ice hockey he should must have necessary equipment to support his sport. These equipment include Ice Skates,Helmet with Cage and Mouth-guard:, Hockey stick, Hockey pants,Hockey gloves, shoulder pads, elbow pads, Shin Guard:Neck guard and Jockstrap (men) or Pelvic protector (women)

Explanation:

Answer:

If one plays ice hockey he should must have necessary equipment to support his sport. These equipment include Ice Skates,Helmet with Cage and Mouth-guard:, Hockey stick, Hockey pants,Hockey gloves, shoulder pads, elbow pads, Shin Guard:Neck guard and Jockstrap (men) or Pelvic protector (women).

If a reddish and a bluish star have the same luminosity, then the reddish star must be larger than the bluish star. This is again due to the Stefan-Boltzmann law; since the cooler, red star must have more surface area than a hot blue star to produce the same luminosity.

Answer:

11.37N

Explanation:

We can use the GUESS method to derive our solution.

Given:

We know our mass, and our acceleration. The acceleration on the moon is 1.625m/s^2.

\(m = 7kg \\ a = 1.625 \frac{m}{ {s}^{2} } \)

Unknown:

We don't know, and are trying to find the force in Newtons.

\(F\)

Equation:

We can use Newton's second law to find the solution.

\(F = ma\)

Substitute:

Let's substitute our values into our equation.

\(F = 7 \times 1.625\)

Solve:

We find our solution after solving for F.

\(7 \times 1.625 = F \\ 11.37 = F\)

Our solution is 11.37N

Answer:

4. The choose b. 0.000355

Ans; 3.55× 10-⁴ = 0.000355

5. The choose C. 80600

Ans; 8.06 ×10⁴= 806×10² = 80600

I hope I helped you^_^

According to the question the speed of the skater's hands is 528 m/min.

To calculate the speed of the skater's hands, we can use the formula:

Speed = Circumference * Revolutions per minute

Given that the skater's hands are 140 cm apart and she spins at 120 rpm, we need to calculate the circumference of the circle formed by her hands.

The circumference of a circle is given by the formula:

Circumference = 2 * π * radius.

In this case, the radius is half the distance between the skater's hands, which is 140 cm / 2 = 70 cm.

Converting the radius to meters, we have 70 cm = 0.7 m.

Now we can calculate the circumference:

Circumference = 2 * π * 0.7 m = 4.4 m (rounded to one decimal place).

Finally, we can calculate the speed of the skater's hands:

Speed = Circumference * Revolutions per minute

     = 4.4 m * 120 rpm

     = 528 m/min.

Therefore, the speed of the skater's hands is 528 m/min.

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