A new ski area has opened that emphasizes the extreme nature of the skiing possible on its slopes. Suppose an ad intones "Free-fall skydiving is the greatest rush you can experience . . . but we’ll take you as close as you can get on land. When you tip your skis down the slope of our steepest runs, you can accelerate at up to 75% of the acceleration you’d experience in free fall." What angle slope could give such an acceleration?

Category II electric meters are safe for working on low voltage circuits that have a current of less than or equal to 10A. The low voltage circuits with currents less than or equal to 10A are the types of circuits that Category II electric meters are safe for working on.

Category II electric meters are considered safe for low-voltage circuits with currents up to 10 amps. The 10-ampere maximum rating ensures that the electric meter's internal components are secure and the electric meter is not damaged by higher currents.

Since low-voltage circuits are commonly utilized for electronic devices, measuring and testing these circuits frequently need a category II electric meter.

Therefore, category II electric meters are safe for use in low-voltage circuits with currents of less than or equal to 10A.

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The pressure of the Venus atmosphere at a height of 1 km from the planet's surface can be calculated using the given information, such as the initial pressure at the surface (p0 = 9.3 MPa), the planet's mass (4.9x10^24 kg), and its radius (6050 km).

To calculate the pressure at a certain height in the Venus atmosphere, we can make use of the barometric formula, which relates the pressure and height in a planetary atmosphere.

The formula is given by:

p = p0 * exp(-M * g * h / (R * T)) where p is the pressure at the given height, p0 is the initial pressure at the surface, M is the molar mass of the gas (in this case, CO2), g is the acceleration due to gravity, h is the height, R is the gas constant, and T is the temperature.

Given the temperature (477°C) and the molar mass of CO2, we can use the above formula to calculate the pressure at 1 km height from the surface of Venus, using the provided values of p0, the planet's mass, and radius.

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Constant acceleration of plane = 3m/s²

a) Speed of the plane after 4s

Acceleration = speed/time

3m/s² = speed/4s

S = 12m/s

The speed of the plane after 4s is 12m/s.

b) Flight point will be termed as the point the plane got initial speed, u, 20m/s

Find speed after 8s, v

a = 3m/s²

from,

a = v - u

t

3 = v - 20

8

24 = v - 20

v = 44m/s

After 8s the plane would've 44m/s speed.

Answer:

answer is 2 ms-2

Explanation:

v= 10.0 m/s

u=4.0 m/s

t=3.0 seconds

a=?

from equation, v= u+at

10.0 m/s =4.0 m/s + a × 3s

6 m/s. = 3a

6/3 = a

2.0 m/s-2 = a

Answer:

High pitch means small wavelength, and the size of a musical instrument is directly related to the wavelengths of sound it produces. So a small instrument creates short-wavelength sounds. Similar arguments hold that a large instrument creates long-wavelength sounds.

Explanation:

Answer:

see below

Explanation:

higher the frequency and shorter the wavelength, the higher the ionising radiation,

you can see that gamma rays has more ionising radiation than infrared radiation

hope this helps

The relationship of EM wavelength and frequency to the ionizing radiation of EM spectrum can be expressed as V = Fλ

The frequency and wavelength are inversely proportional to each other.

In electromagnetic radiation, several types of electromagnetic wave are:

They all travel at the same speed in a vacuum. Which is approximately equal to 3 x \(10^{8}\) m/s

If the wavelength of EM is λ and the frequency is F, then  the relationship of EM wavelength and frequency to the ionizing radiation of EM spectrum can be expressed as;

V = Fλ

The regions of the electromagnetic spectrum from a distance which is receding from earth at speed V, its wavelength will be increased and its frequency will be decreased. In another scenario, it will be vice versa.

The frequency and wavelength are therefore inversely proportional to each other.

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Answer:

A. So that you can see if the answer to a problem makes physical sense.

Explanation:

Science can be defined as a branch of intellectual and practical study which systematically observe a body of fact in relation to the structure and behavior of non-living and living organisms (animals, plants and humans) in the natural world through experiments.

An experiment can be defined as an investigation which typically involves the process of manipulating an independent variable (the cause) in order to be able to determine or measure the dependent variable (the effect).

This ultimately implies that, an experiment can be used by scientists to show or demonstrate how a condition causes or gives rise to another i.e cause and effect, influence, behavior, etc in a sample.

Measurements refers to the process which typically involves the process of identifying and determining the dimensions of a physical object. The dimensions include important parameters such as width, height, length, area, volume, circumference etc.

In Science, making rough estimates of physical quantities is useful so that you can see if the answer to a problem makes physical sense.

For example, you could make a rough estimate of a storage tank and deductively determine whether or not it's in tandem with its physical size in reality.

Within the boundaries of the constellations Coma and Virgo, numerous galaxies can be found. In fact, the Virgo Cluster of galaxies is one of the most prominent galaxy clusters in the nearby universe and contains over 2,000 galaxies.

The Coma Cluster of galaxies is located in the constellation Coma Berenices and is another rich cluster of galaxies that is also studied by astronomers. It contains more than 1,000 galaxies and is one of the most massive structures in the universe.

In addition to these large clusters of galaxies, there are also many individual galaxies within the boundaries of Coma and Virgo. For example, the Sombrero Galaxy (M104) is a prominent galaxy in the constellation Virgo, while the Coma Galaxy Cluster contains many individual galaxies, including NGC 4889, which is one of the largest galaxies known.

Additionally, the Coma Cluster is another notable cluster of galaxies located in this region of the sky. Both of these clusters are important objects of study for astronomers as they offer insights into the formation and evolution of galaxies and galaxy clusters.

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The electromagnet becomes weaker when the number of coils around the nail is decreased. The correct answer is "It becomes weaker."

An electromagnet is created by coiling a wire around a magnetic core, such as a nail, and running an electric current through the wire. This creates a magnetic field around the wire, which magnetizes the core.

The strength of the magnetic field and thus the strength of the electromagnet is directly proportional to the number of coils around the magnetic core.

This is because each coil adds to the magnetic field, and the more coils there are, the stronger the magnetic field becomes.

When some coils are removed, there are fewer coils contributing to the magnetic field. As a result, the strength of the magnetic field and thus the strength of the electromagnet decreases.

Therefore, the correct option is " it becomes weaker" when the number of coils around the nail is decreased.

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Answers are:

2. 0.163 m CuI2: Second highest boiling point

3. 0.173 m Cr(NO3)2: Third highest boiling point

4. 0.580 m urea (nonelectrolyte): Lowest boiling point

To determine the order of boiling points based on the given solutions, we need to consider the nature of the solute and its effect on boiling point elevation. In general, a higher concentration of solute particles in a solution leads to a higher boiling point compared to a pure solvent.

Using this information, we can rank the solutions in terms of their boiling points:

1. 0.580 m urea (nonelectrolyte) - This solution has the lowest boiling point since urea is a nonelectrolyte, meaning it does not dissociate into ions in solution. Non-electrolytes typically have a negligible effect on boiling point elevation.

2. 0.163 m CuI2 - Copper(I) iodide (CuI2) is an ionic compound. When it dissolves, it dissociates into Cu²⁺ and 2I⁻ ions, resulting in an increased number of solute particles. Therefore, it has the second highest boiling point among the given solutions.

3. 0.173 m Cr(NO3)2 - Chromium(II) nitrate (Cr(NO3)2) is also an ionic compound. It dissociates into Cr²⁺ and 2NO₃⁻ ions in solution, resulting in a higher concentration of solute particles compared to the previous solutions. Thus, it has the third highest boiling point.

2. 0.163 m CuI2: Second highest boiling point

3. 0.173 m Cr(NO3)2: Third highest boiling point

4. 0.580 m urea (nonelectrolyte): Lowest boiling point

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A device that uses electromagnetic induction to transfer electrical energy from one circuit to another is a transformer.

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Answer:

what are semimoval joints

When blowing across the top of an empty bottle, a relatively loud sound can be created because a standing wave occurs in the bottle. A standing wave is formed when a wave interferes with its reflected wave, creating points of constructive and destructive interference. The resonance of the standing wave amplifies the sound.

As the bottle is filled with water, the pitch of the sound becomes higher. This happens due to the change in the effective length of the air column inside the bottle. When the bottle is empty, the entire length of the bottle is available for the formation of the standing wave. This means that the air column inside the bottle is longer, resulting in a lower pitch.

As water is gradually poured into the bottle, the effective length of the air column decreases. This happens because the water occupies space inside the bottle, effectively reducing the available length for the standing wave. With a shorter effective length, the wavelength of the standing wave decreases.

According to the wave equation (speed = frequency x wavelength), if the speed of sound remains constant, a shorter wavelength leads to a higher frequency and, therefore, a higher pitch. By filling the bottle with water, we are effectively shortening the length of the air column and increasing the frequency of the standing wave, resulting in a higher-pitched sound.

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The calculated value of the current will be IB = 2.9176 uA

KVL stands for Kirchhoff's Voltage Law. It is one of the fundamental laws in electrical circuit analysis, named after Gustav Kirchhoff, a German physicist.

Kirchhoff's Voltage Law states that the sum of the voltages around any closed loop in an electrical circuit is equal to zero. In other words, the algebraic sum of the voltage drops (or rises) in a closed loop must be equal to the sum of the voltage sources in that loop.

Apply kvl from collector to base to emitter loop.

-VCC +IB x RB + VBE + IE x RE=0

IE = (1+β)IB

-VCC +IB x RB+VBE+(1+β)IB x RE=0

-20+510k x IB+0.7+(101) x IB x 1.5K=0

IB = 2.9176 uA

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The missing circuit is attached below.

They are free electrons that can be used by any atom.

ok, i will try to explain this the best i can.

Okay, so we know that in the first shell there are 2 electrons. Only 2 electrons can fit into the first shell.

Then we have the second shell which can fit only 8 electrons.

Then, lets say we have a third shell. The third has one electron in the valence shell. The ion is "unhappy/unbalanced". We need to remove that electron to make the ion balance. So we need to remove that one electron and transfer it to another ion to make that ion "happy/balanced".

hope this helps you understand.

Answer:

Explanation:

Itis the 2nd one

Answer:

She was her mother.

:-)

Answer:

She was her mother.

Explanation:

Answer:

Explanation:

1)Melting:

Melting is the process by which a substance changes from the solid phase to the liquid phase. ... Melting occurs when the internal energy of a solid increases, usually through the application of heat or pressure, such that the molecules become less ordered.

2) liquefication:

In physics and chemistry, the phase transitions from solid and gas to liquid (melting and condensation, respectively) may be referred to as liquefaction. The melting point (sometimes called liquefaction point) is the temperature and pressure at which a solid becomes a liquid.

3) vaporization:

Vaporization, conversion of a substance from the liquid or solid phase into the gaseous (vapour) phase. If conditions allow the formation of vapour bubbles within a liquid, the vaporization process is called boiling. Direct conversion from solid to vapour is called sublimation.

4) Sublimation occurs as molecules of a substance in the solid state go to the vapor state directly, rather than through the liquid state. ... ⭕In terms of the kinetic molecular theory, we know that molecules are in constant random motion, even when the substance is below the melting point.

When Lana is gliding across the pond on ice skates. By the time she makes it to the other side of the pond, she has nearly come to a complete stop.  Friction forces has caused her to slow down. Hence option D is correct.

When two surfaces move relative to each other, the friction between them turns kinetic energy into thermal energy (that is, work to heat). As demonstrated by the utilisation of friction caused by rubbing pieces of wood together to ignite a fire, this feature may have severe repercussions. When motion with friction occurs, such as when a viscous fluid is churned, kinetic energy is transformed to thermal energy. Another significant effect of many forms of friction is wear, which can lead to performance deterioration or component damage. The science of tribology includes friction. Ice skates are metal blades affixed to the bearer's feet that are used to drive the bearer across a sheet of ice when ice skating.

Hence option D is correct.

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Answer:

80/2= 40 m/s^2.

Explanation:

A jet starts at rest at the end of a runway and reaches a speed of 80 m/s in 20 s.  Its acceleration is 4 m/sec².

The rate at which an item changes its velocity is known as acceleration, a vector quantity. If an object's velocity is changing, it is acceleration.

The net acceleration that objects get as a result of the combined action of gravity and centrifugal force is known as the Earth's gravity, or g. It is a vector quantity whose strength or magnitude is determined by the norm and whose direction correlates with a plumb bob.

acceleration = change in velocity / time

acceleration = 80 / 20

acceleration = 4 m/sec²

A jet starts at rest at the end of a runway and reaches a speed of 80 m/s in 20 s.  Its acceleration is 4 m/sec².

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Answer:

Distance = 30 meters

Explanation:

Given the following data;

Speed = 1.5 m/s

Time = 20 seconds

To find the distance travelled;

Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.

Mathematically, speed is given by the formula;

\(Speed = \frac{distance}{time}\)

Making distance the subject of formula, we have;

\( Distance = speed * time \)

Substituting into the above formula, we have;

\( Distance = 1.5 * 20 \)

Distance = 30 meters

Answer:

\(5.8\; {\rm kg\cdot m \cdot s^{-1}}\).

Explanation:

If the mass of an object is \(m\) and the velocity of that object is \(v\), the linear momentum of that object would be \(m\, v\).

Assume that the initial velocity of the mass is positive (\(6.0\; {\rm m\cdot s^{-1}}\).) However, the direction of the velocity is reversed after the impact. Thus, the sign of the new velocity of the object would be negative- the opposite of that of the initial velocity. The new velocity would be \((-4.0\; {\rm m\cdot s^{-1}})\).

Thus, the change in the velocity of the mass would be:

\(\begin{aligned}& (\text{Change in Velocity}) \\ =\; & (\text{Final Velocity}) - (\text{Initial Velocity}) \\ =\; & (-4.0\; {\rm m\cdot s^{-1}}) - (6.0\; {\rm m\cdot s^{-1}}) \\ =\; & (-10\; {\rm m\cdot s^{-1})\end{aligned}\).

The change in the linear momentum of the mass would be:

\(\begin{aligned} & \text{change in momentum} \\ =\; & (\text{mass}) \times (\text{change in velocity}) \\ =\; & 0.58\; {\rm kg} \times (-10\; {\rm m\cdot s^{-1}}) \\ =\; & (-5.8\; {\rm kg \cdot m \cdot s^{-1}})\end{aligned}\).

Thus, the magnitude of the change of the linear momentum would be \(5.8\; {\rm kg \cdot m \cdot s^{-1}}\).

When the speed of a car is reduced by 12.9 percent, the braking distance decreases by approximately 26.9 percent.

To calculate the percentage decrease in braking distance, we can use the concept of proportionality. Braking distance is directly proportional to the square of the initial speed of the car. Therefore, if the speed is reduced by a certain percentage, the braking distance will decrease by a larger percentage.

Let's assume the initial braking distance is D. When the speed is reduced by 12.9 percent, the new speed becomes 100 percent minus 12.9 percent, which is 87.1 percent of the initial speed. Since the braking distance is directly proportional to the square of the speed, the new braking distance will be (87.1 percent)² of the initial braking distance.

The percentage decrease in braking distance can be calculated as follows:

Percentage decrease = (1 - New distance / Initial distance) * 100

Percentage decrease = (1 - (87.1 percent)²) * 100

Percentage decrease ≈ 1 - 0.7581 ≈ 0.2419 ≈ 24.19 percent

Therefore, the braking distance of the car decreases by approximately 24.19 percent when the speed of the car is reduced by 12.9 percent.

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Answer:

1.968504 ft/s

We are unable to directly determine the work performed by the engine because the distance over which the force acts is unknown.

This indicates that the effort expended to increase the car's speed will be equivalent to the change in kinetic energy of the vehicle. Thus, 30 kJ of effort must be performed.

The work W is equal to the force f times the distance d, or W = fd, to mathematically describe this idea.

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Answer:

Chemical energy is energy stored in the bonds of atoms and molecules. ...

Mechanical energy is energy stored in objects by tension. ...

Nuclear energy is energy stored in the nucleus of an atom—the energy that holds the nucleus together. ...

Gravitational energy is energy stored in an object's height.

Answer:

Nuclear power

Electricity

Mechanic

Gravity

Explanation:

The amount of work done in moving a point charge Q around a circular arc of radius 'r' at the center of which another point charge 'q' is located is

W = (1/4πε₀) [(qQ)/r] [1 - cosθ], where θ is the angle of the circular arc measured in radians.

If a point charge Q is moved around a circular arc of radius r at the center of which another point charge q is situated, then work is done on the point charge Q. The amount of work done depends on the force exerted on the charge Q by the charge q and the distance traveled by the charge Q. Since the charge Q moves around a circular arc, we need to use the formula for the work done by a force when an object moves in a circular path.

The electric force exerted by the charge q on the charge Q is given by Coulomb's law:

F = (1/4πε₀) [(qQ)/r²], where ε₀ is the permittivity of free space. The direction of the force is along the line joining the charges q and Q. When the charge Q is moved around a circular arc of radius r, the direction of the force varies with the angle θ.

The work done by the force when the charge Q moves from one point on the circular arc to another is given by:

dW = F.dr.cosφ where dr is the displacement vector, φ is the angle between the direction of the force and the displacement vector, and cosφ is the angle between the force and the displacement vector. Since the displacement dr is perpendicular to the point F, we have φ = 90°. Therefore, cosφ = 0. Hence,

dW = F.dr.cosφ = 0

So, the work done by the electric force on the charge Q is zero when it is moved around a circular arc of radius r at the center of which another point charge q is situated.

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One hypothesis for planetary differentiation is the process through which various layers with diverse chemical and/or physical features arise.

A planet's trajectory around a star, a natural satellite's path around a planet, or an artificial satellite's course around a space object or place, such as a planet, moon, asteroid, or Lagrange point, are examples of orbits in celestial mechanics.

A spacecraft, planet, moon, star, or other object travels on a curved route called an orbit when it is dragged by the gravity of another object.

The force of gravity is what pulls objects with mass in space. An orbit is a path an object follows as it travels around a certain location in space, such as the Moon's orbit of the Earth.

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Answer:

for number 10

I can't see what needs to be calculated for the first question though