do i need to adjust the tension on my elna super sewing machine when using denim fabric and 100/16 needles?

Answer:

I think ur answer would be B

Explanation:

srry if wrong

hope this helps

This is the same height as the clown, so if he looks up at the mirror from the floor he should be able to see his feet reflected in the mirror.

Mirror is a reflective surface, typically of glass, which displays images of objects placed in front of it. Mirrors are used in a variety of different applications, including personal grooming, decoration, interior design, viewing art, scientific uses, and more. A mirror is composed of a flat, smooth surface that reflects light in a specific direction. This reflection is what produces the image we see in the mirror. The reflective surface is usually made of glass, although other materials such as metal, plastic, and wood can also be used. Mirrors can be manufactured in a variety of shapes and sizes, from small hand-held makeup mirrors to large wall-mounted mirrors. Some mirrors are also designed with special coatings or treatments to enhance their reflective properties.

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No, centripetal force acting on an object does not do work on the object.

Centripetal force is not a fundamental force; rather, it is the name given to any force that causes a body to travel in a circle or curved path. It works at right angles to the direction of motion and points toward the center of the curve. For example, the force of gravity that pulls the moon towards the Earth is a centripetal force that keeps it in orbit. Centripetal force does not do any work because the force and displacement vectors are perpendicular. As a result, the dot product is zero, indicating that no work is being done. When a body travels in a circle, the speed and direction of the body are constantly changing, but the total work done on the body is zero. The work done by the force of gravity and the normal force in a circular path is equal to zero.

Centripetal force does not do any work because the force and displacement vectors are perpendicular. When a body travels in a circle, the speed and direction of the body are constantly changing, but the total work done on the body is zero.

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The value 159,000 J equals the total mechanical energy of the coaster car at this point. The 3rd option is the correct option.

In the physics mechanical energy (M.E) at a point in space =P.E (potential energy)+k.E(kinetic energy). Mechanical energy of a body is a constant in a scenario, all the changes that are observed is either in P.E or K.E, if one increase with x J the other will decrease with x J ,thus their sum or mechanical energy remain constant.

Given in the problem P.E is 27,000 J and K.E is 132,000 J on adding we found that their sum is 159,000 J, so the sum of these energies represent the Mechanical energy of the rollar coaster.

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Answer:

ok so first ur not a failure and its okay don't be so hard on ur self

When running low-voltage thermostat wire through the roof to the conditioned space, it is recommended to position the thermostat as close to the cooling or heating source as possible.

When installing a low-voltage thermostat, it is essential to consider its proximity to the cooling or heating source. Placing the thermostat as close as possible to the source ensures accurate temperature sensing and efficient control of the HVAC system. By locating the thermostat near the cooling or heating equipment, it can better measure the actual temperature experienced by the conditioned space. This helps in achieving precise temperature control and maintaining optimal comfort levels.

Additionally, positioning the thermostat near the source reduces the potential for temperature variations caused by external factors or environmental conditions. If the thermostat is placed farther away from the cooling or heating equipment, it may receive inaccurate temperature readings, leading to inefficient heating or cooling operations.

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The force applied to a can when it is whirled aloft by a string in a circle is in the direction of the circle's centre. The can is kept moving in a circular motion by a force known as the centripetal force.

A force that operates on a moving item in a circular motion and is directed toward the centre of the circle is called a centripetal force. It is the force that prevents an object from travelling in a straight line and prohibits it from moving on a curved route.

The following formula can be used to determine the amount of the centripetal force:

\(F = m \times a\)

where:

F is the centripetal force,

The object's mass is m, and

The centripetal acceleration, abbreviated a, is the acceleration that points in the direction of the circle's center and may be calculated using the following formula:

\(a = v^2 / r\)

where:

v is the velocity of the object, and

r is the radius of the circular path.

The centripetal force always points in the direction of the circle's centre and is inversely proportional to the mass and speed of the item; an object with a higher mass and speed will exert a greater centripetal force.

Therefore, The centripetal force always acts in a radial direction, since its direction is perpendicular to the object's motion.

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The valley or ravine landfill method utilizes "lifts" from the bottom up with depths usually of 6 to 8 feet.

This means that the landfill is built up in layers or lifts, with each layer being 6 to 8 feet deep. The waste is then compacted and covered with a layer of soil before the next lift is added. This method is used in valleys or ravines because it allows for the natural contours of the land to be used, minimizing the need for excavation and land disturbance. It also helps to contain the waste in a specific area, making it easier to manage and monitor. Overall, the valley or ravine landfill method is an efficient and environmentally responsible way to dispose of waste.

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The typical speed of a helium atom in a child's balloon at room temperature is 1352 m/s.

Given:

Temperature, t = 20⁰ C

From the Maxwell-Boltzmann distribution and the root-mean-square (rms) speed formula.

v= √(3kT/m)

Here, (v) is the root-mean-square speed, (k) is the Boltzmann constant, (T) is the temperature in Kelvin, and (m) is the molar mass of the gas.

Convert temperature into kelvin:

T = 20 °C + 273.15 = 293.15 K

To convert the molar mass to kilograms:

m = (4.00 g/mol) / (6.022 × 10²³ particles/mol) ≈ 6.646 × 10⁻²⁶ kg

The rms speed using the formula is:

v= √(3kT/m)

v = √[(3 ×1.38 × 10⁻²³) J/K × 293.15 K) / (6.646 × 10⁻²⁶ kg)]

v = 1352 m/s

Hence, the speed is, 1352 m/s.

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Answer:

It can be measured by using laboratory thermometer.

The range of magnetic field strengths on the Earth's surface varies depending on the location and geological features of the area.

The magnetic field of the Earth is not uniform and varies in strength, direction, and intensity over time and location.

At the equator, the magnetic field strength is about 30,000 to 60,000 nanotesla (nT), while at the poles, the strength can be as high as 60,000 to 80,000 nT. In general, the magnetic field strength at the Earth's surface is typically between 25,000 to 65,000 nT.

However, the magnetic field of the Earth is subject to fluctuations and changes due to various factors, such as solar activity, geological changes, and other natural phenomena. These fluctuations can cause variations in the strength and direction of the magnetic field, which can have significant implications for a variety of fields, including navigation, geology, and space weather forecasting.

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Answer:

Explanation:

60 times 5=300+24=324

207/324= aveage i dont have a calculator

use the average and mutiple by 88 minutes

Radio telescopes must be larger than optical telescopes because of the longer wavelengths of radio waves, which result in a lower diffraction limit.

The diffraction limit of a telescope is determined by its aperture size, or the diameter of its collecting area. For the Hubble Space Telescope, the diffraction limit for visible light is approximately 0.05 arcseconds. This means that the telescope can resolve structures or details that are separated by at least 0.05 arcseconds of an angle.

On the other hand, radio telescopes are much larger than optical telescopes because radio waves have longer wavelengths than visible light. The diffraction limit of a radio telescope is proportional to the wavelength of the radiation it observes. Because radio wavelengths are much longer than those of visible light, radio telescopes must be much larger in order to achieve the same level of resolution as optical telescopes.

In addition, radio telescopes can detect emissions from much larger structures in space, such as galaxies and clusters of galaxies. These emissions are typically very weak and difficult to detect, so radio telescopes must have a large collecting area in order to detect them.

To sum up, radio telescopes must be larger than optical telescopes because of the longer wavelengths of radio waves, which result in a lower diffraction limit, and the need to detect weak radio emissions from large structures in space.

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The magnetic field of a wave propagating through a certain nonmagnetic material can be described by the Maxwell's equations, which govern the behavior of electromagnetic waves.

In particular, the magnetic field is related to the electric field and the rate of change of the electric field by the equation known as Faraday's law. This law states that a changing magnetic field induces an electric field, and vice versa.

However, since the material in question is nonmagnetic, there are no free magnetic charges that can interact with the electromagnetic wave. Therefore, the magnetic field is solely due to the changing electric field, which in turn is caused by the oscillation of charged particles in the material. The exact form of the magnetic field depends on the geometry of the wave and the properties of the material, such as its permittivity and conductivity.

In summary, the magnetic field of a wave propagating through a nonmagnetic material is determined by Faraday's law and the interaction of the electric field with charged particles in the material.

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The distance between the two stars in their rest frame is approximately 15.63 light-years.

Length contraction is the phenomenon that a moving object's length is measured to be shorter than its proper length, which is the length as measured in the object's own rest frame.

To answer this question, we can use the concept of length contraction in special relativity.

The formula for length contraction is:
\(L = L_0 * \sqrt{(1 - v^2 / c^2)\)
where L is the contracted length (7.86 light-years in this case), L₀ is the proper length (the distance between the stars in their rest frame), v is the velocity of the spaceship (90.1% of the speed of light), and c is the speed of light.

First, we need to find the factor by which the length contracts:
\(\sqrt{(1 - v^2 / c^2)} = \sqrt{(1 - (0.901c)^2 / c^2)} = \sqrt{(1 - 0.811801)\)

Now we can solve for L₀:
L₀ = L / \(\sqrt{(1 - 0.811801)\) = 7.86 light-years /  \(\sqrt{(1 - 0.811801)\)

L₀ ≈ 15.63 light-years
This is the required distance.

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Refraction of sound occurs with changes in wave velocity.

Refraction is the bending of a wave as it passes from one medium to another, caused by the change in its velocity. When sound waves travel through different mediums, such as air, water, or solids, their velocity changes due to variations in the properties of the medium, such as density and elasticity.

The speed of sound in a medium is determined by the formula v = √(γRT / M), where v is the velocity, γ is the ratio of specific heats, R is the gas constant, T is the temperature, and M is the molar mass of the medium. As the sound wave encounters a boundary between two different mediums, the change in their properties affects the velocity of the wave.

When the sound wave crosses the boundary, the change in velocity causes the wavefront to bend, resulting in refraction. The extent of refraction depends on the angle of incidence and the difference in wave velocity between the two mediums. If the sound wave enters a medium where its velocity decreases, it bends towards the normal. Conversely, if the sound wave enters a medium where its velocity increases, it bends away from the normal.

In summary, refraction of sound occurs due to changes in wave velocity as the sound wave propagates from one medium to another, leading to the bending of the wavefront.

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When we are talking about how quickly "how fast" changes, we're talking about acceleration.

Measures of motion include both speed and velocity. But there is a significant distinction between the two. Speed is a scalar quantity that describes "how fast an object is moving." It refers to how quickly an object travels a distance. The vector quantity known as velocity, on the other hand, denotes "the rate at which an object changes its position." It is the pace at which an object shifts in one direction over another. So, velocity is simply speed in a certain direction.

The concept of speed or velocity.

When we discuss acceleration, we are discussing how quickly "how fast" changes. The pace at which a speed changes over time is called acceleration. In other terms, it is the rate of change in velocity (or speed).
When we are talking about how quickly "how fast" changes, we're talking about acceleration.

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The quantity that describes how tightly packed matter is inside of an object is: a) density

The density of an object is the relation that exist between the mass and the space that the object occupies. The general formula of the density is:

ρ = m/v

Where:

For example if we want to know which is the density of a body that has a mass of 100g and a volume of 150 cm³, applying the density formula we get:

ρ = 100 g/150 cm³

ρ = 0.666 g/cm³

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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Answer:

A light-year is the distance light travels in one year. How far is that? Multiply the number of seconds in one year by the number of miles or kilometers that light travels in one second, and there you have it: one light-year. It's about 5.88 trillion miles (9.5 trillion km).

Explanation:

Answer:

 The main reasons are two. Mercury's atmosphere is hard to hold onto because it is small and does not have much gravity. As Mercury is close to the Sun, any atmosphere is blasted away by material being blown off the Sun.

Hope this helps friend!

Answer:

the inertia of an object

No , frequency of a wave is not distance between waves, it is called wavelength.

Frequency is the number of waves that pass a particular point in a given period of time. It is typically measured in Hertz (Hz), which is the number of waves per second. Wavelength, on the other hand, is the distance between two consecutive crests or troughs of a wave. It is typically measured in meters (m). So frequency and wavelength are related, but they are not the same thing. Frequency is a measure of the number of waves, while wavelength is a measure of the distance between waves.

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Answer: A watt unit is equal to 1 joule/sec.

Explanation:  So you have a lightbulb with 50% efficiency, so it turns half the energy it consumes into light energy.

5 answers

Answer:

Approximately \(2.69\; {\rm A}\).

Explanation:

Ensure that all values are measured in standard units. Charge should be measured in coulombs, while time should be measured in seconds:

\(\begin{aligned}t &= 3.0\; {\rm hr} \times \frac{3600\; {\rm s}}{1\; {\rm hr}} = 10800\; {\rm s}\end{aligned}\).

Electric current \(I\) is the rate of flow of electric charge.

In order to find the electric current, divide electric charge \(q\) by the time \(t\) required to transfer these charge. If charge \(q\!\) is measured in coulombs and time \(t\!\) is measured in seconds, the unit of current \(I\)would be amperes:

\(\begin{aligned}I & = \frac{q}{t} \\ &= \frac{29000\; {\rm C}}{10800\; {\rm s}} \approx 2.69\; {\rm A}\end{aligned}\).

Answer:

the two pieces are:

Explanation:

Evidences of sea floor spreading

It has been reported that from geodetic evidence that Greenland is drifting westward at the rate of 20cm per year.

Geographical similarities between the opposing coast of Atlantic ocean

The outlines of the coast on the other two sides of the Atlantic are such that they can be easily joined together and appear to be a detached portion of one another.

Answer:

Explanation:

A capacitor is an electronic component that stores and releases electrical energy. It consists of two conductive plates separated by an insulating material called a dielectric. When a voltage is applied across the plates, charge accumulates on them, creating an electric field between the plates.

The capacitance of a capacitor is a measure of its ability to store charge. It is typically represented by the symbol 'C' and is measured in farads (F). In your case, you mentioned a 55-μF (microfarad) capacitor, indicating its capacitance value.

When a voltage waveform is applied across a capacitor, the capacitor charges and discharges in response to the changes in voltage. The rate at which the capacitor charges and discharges depends on the capacitance and the resistance in the circuit

Since there is no figure provided in the text, I am unable to reference it for the specific details of the voltage waveform. However, I can explain the general behavior of a capacitor when a voltage waveform is applied.

When a voltage waveform is applied across a capacitor, the capacitor charges and discharges in response to the changes in voltage. The behavior of the capacitor is determined by its capacitance, which is given as 55 μF in this case.

As the voltage waveform varies, the capacitor stores and releases electrical charge. During the rising portion of the waveform, the capacitor charges and accumulates energy. During the falling portion, the capacitor discharges and releases the stored energy.

The exact behavior and characteristics of the voltage waveform and the charging/discharging process depend on the specific shape and frequency of the waveform. Without the specific details of the voltage waveform provided in the figure, it is challenging to provide a more detailed analysis.

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The maximum torque on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the magnetic field vector is 90 degrees.

When a current-carrying loop is placed in a magnetic field, a torque is exerted on the loop.

This torque is given by the formula τ = μ x B x sinθ,

where τ is the torque,

μ is the magnetic moment of the loop (equal to the product of the current and the area of the loop),

B is the magnetic field strength, and θ is the angle between the loop's area and the magnetic field vector.

To find the maximum torque, we need to maximize the value of sinθ.

The maximum value of sinθ is 1, which occurs when the angle θ is 90 degrees (sin90° = 1).

Therefore, the maximum torque on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the magnetic field vector is 90 degrees.

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Answer:

it decrease by 9 times

Explanation:

If the separation distance between any two objects is tripled (increased by a factor of 3), then the force of gravitational attraction is decreased by a factor of 9 (3 raised to the second power).

The frequency of the wave is the inverse of time period. Here, the period of the wave is 10 seconds. Hence, the 0.4 Hz.

Frequency of a wave is the number of wave cycles per unit time. Frequency is the inverse of the time period of the wave. Hence, it has the unit of s⁻¹ which is equivalent to Hz.

The higher frequency of a wave indicates more number of wave cycles in a short time. Frequency is directly proportional to the energy and inversely proportional to the  wavelength.

Given the time period of the wave = 10 seconds

then frequency = 1/10 s = 0.1 Hz.

Therefore, the frequency of the wave is 0.1 Hz.

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Your complete question given below:

When a crest of the wave passes point P, a watch reads 0 s. When the next crest passes point P, the watch reads 10 s. What is the frequency of the wave ?