as you roll a ball a hill , the ball's instantaneous velocity

a, increases
b, remains the same
c, decreases​

The length of the copper wire must be approximately 44.2 meters for it to have a resistance of 0.128 ohms, assuming a 14-gauge wire with a diameter of 1.63 mm and using the resistivity of copper.

To find the length of the wire, we can use Ohm's Law, which states that the resistance (R) is equal to the product of the resistivity (ρ), the length (L), and the cross-sectional area (A) of the wire, divided by the diameter (d) of the wire squared.

The formula can be written as:

R = ρ * (L / A)

Resistance (R) = 0.128 ohms

Resistivity of copper (ρ) = (1.68 × 10^-8) ohm-meter (at 20°C)

Diameter (d) = 1.63 mm = 0.00163 meters (converted from millimeters to meters)

We need to find the length (L) of the wire.

To calculate the cross-sectional area (A) of the wire, we can use the formula for the area of a circle:

A = π * (d/2)^2

Plugging in the values, we have:

A = 3.14159 * (0.00163 / 2)^2

A  ≈ 2.08 x 10^-6 square meters

Rearranging Ohm's Law to solve for the length (L), we get:

L = (R * A) / ρ

Substituting the given values:

L = (0.128 * 2.08 x 10^-6) / (1.68 x 10^-8)

L  ≈ 44.2 meters

The length of the copper wire must be approximately 44.2 meters for it to have a resistance of 0.128 ohms, assuming a 14-gauge wire with a diameter of 1.63 mm and using the resistivity of copper.

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The water pollutant that most commonly threatens human health is microorganisms, specifically pathogenic bacteria, viruses, and parasites. These microorganisms can cause a wide range of illnesses, including gastroenteritis, typhoid fever, cholera, and hepatitis A.

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The value of the Fermi-Dirac distribution for energies less than the Fermi energy at absolute zero temperature (T=0K) is 1.00.

The Fermi-Dirac distribution function describes the probability of finding an electron in a specific energy state in a Fermi gas. It is given by the equation:

f(E) = 1 / (1 + exp((E - EF) / (kT)))

Where f(E) is the Fermi-Dirac distribution function, E is the energy, EF is the Fermi energy, k is Boltzmann's constant, and T is the temperature.

At absolute zero temperature (T=0K), the exponential term in the equation becomes infinite for energies less than EF, and the distribution function simplifies to:

f(E) = 1 / (1 + ∞) = 1 / ∞ = 0

Therefore, for energies less than the Fermi energy at absolute zero temperature, the value of the Fermi-Dirac distribution function is 0. However, it's important to note that this result assumes ideal conditions and a non-degenerate Fermi gas.

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Answer:

the correct answer is (c) -, -.

Explanation:

When an object is placed in front of a convex mirror at infinity, the image formed is a virtual image located at the focal point of the mirror.

According to the New Cartesian Sign Convention, the focal length of a convex mirror is negative. Therefore, the sign of the focal length in this case is "-".

Since the image is formed behind the mirror and is a virtual image, its distance from the mirror is negative. Therefore, the sign of the image distance in this case is also "-".

Therefore, the correct answer is (c) -, -.

Answer:

I guess the answer is c the f am not wrong

Explanation:

Eforce    = C q1 q2 / r^2      now   double q1   and double r

Eforce   = C  2 q1 q2 / (2r)^2

EForce  = C 2 q1 q2 / (4 r^2)

EForce  =  2/4 C q1 q2 / r^2     <=====this shows the NEW force is 1/2 the original

          1/2 * 32.81 = 16.41 units

2nd)   Similarly this will result in  1/4 the original force

                 1/4 * 46.66 = 11.67 units

The sprinter's changing speed, as well as the speed of any other moving object or person, is displayed on a velocity-time graph. The slope of the graph line on a velocity-time graph is used to represent acceleration.

Velocity's rate of change with time, both in terms of speed and direction. A point or object going straight ahead is accelerated when it accelerates or decelerates. m/s2 is the unit of acceleration. The term "constant acceleration" refers to the pace at which a particle's velocity changes.

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Answer:

I think all will display the same value

Explanation:

Sorry if this is wrong

Answer:

I think it's option a. this is because,it has longer conductivity.

this might be wrong. I am just in jss2 but I read physics

Two vectors vector a and vector b, each located in a different position in the plane, have equal magnitude and the same direction, both vectors are considered to be parallel to each other.

Two vectors are said to be parallel if and as it were in case the angle between them is degrees. Parallel vectors are too known as collinear vectors, that is two parallel vectors will be continuously parallel to the same line but they can be either within the same direction or within the exact inverse direction. The cross product of any two parallel vectors could be a zero vector. For any two parallel vectors a and b, their dot product is equal to the product of their magnitudes.

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When it is dropping into the sand point the energy of the ball transform from potential energy to kinetic energy.

The energy of motion is known as kinetic energy, and it is manifested in the motion of a particle, an object, or a collection of particles. Any object that moves, such as a person walking, a ball being thrown, food falling from a table, or a charge particle in an electric field, utilizes kinetic energy.

Radiant, thermal, auditory, electrical, and mechanical kinetic energies are the basic categories. Gamma radiation and ultraviolet light, which are constantly travelling through the universe, are instances of radiant energy. Sound energy is kinetic energy that manifests as vibrations, such as when someone plays the drums

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(a) The mass at time t=0 is 460 grams. (b) Rounding to at least one decimal place, the mass last after 45 years is about 119.0 grams.

(a) To find the mass at time t=0, we alternative into the given characteristic:

m(0) = \(460e^(-0.03(0))\)

Since \(e^0\) is the same for at least one, we've got:

m(0) = 460(1) = 460 grams

Therefore, the mass at time t=0 is 460 grams.

(b) To locate the mass final after 45 years, we substitute t=45 into the given function:

m(45) = \(460e^(-0.03(45))\)

Using a calculator or software program, we will evaluate the expression:

m(45) ≈ \(460e^(-1.35\)) ≈ 460(0.2587) ≈ 118.96 grams

Rounding to at least one decimal location, the mass last after 45 years is about 119.0 grams.

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The correct question is:

"Certain radioactive material decays in such a way that the mass remaining after t years is given by the function m(t)=460e −0.03t where m(t) is measured in grams. (a) Find the mass at time t=0. Your answer is (b) How much of the mass remains after 45 years? Your answer is a Round answer to 1 decimal place."

The escape velocity is 5.6 km/s at a point 4R kilometer from the center of the Earth, if R is the radius of the Earth.

Escape velocity is formulated as: v = √(2GM/R)

Escape velocity at the surface of the Earth, v₁ = 11.2 km/s

Let at the height of h km the escape velocity, = 5.6 km/s

Let the radius of the Earth = R

v² = 2GM/R

11.2² = 2GM/R....equation (1)

5.6² = 2GM/h....equation (2)

On dividing equation (1) by equation (2)

11.2²/5.6² = [2GM/R]/[2GM/h]

125.44/31.36 = h/R

h = 4R

Hence option A is correct.

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--The given question is incomplete, the complete question is:

"The escape velocity from earth at point a is 5.6 km/s. how far is point a from the earth center? the earth's escape velocity at its surface is 11.2km/s and the radius of the earth is r km. group of answer choices are  A) 4R km B) R/4 km C) R/2 km D) 2R km"--

The true of an image produced by this mirror will be 2.5 times smaller and virtual. Option C is correct.

When light beams from an object reflect off a mirror, they intersect with the picture of that thing called an image. Real and virtual images are the two sorts of images.

The ratio of xi to xo for a certain mirror is 2.5;

\(\rm \frac{x_i}{x_0} =2.5 \\\ x_i=2.5 x_0\)

Where,

\(\rm x_0\) is the true of an image produced by this mirror.

The true of an image produced by this mirror will be 2.5 times smaller and virtual.

Hence,option C is correct.

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The frequency of light with a wavelength of λ = 1.30 Å is approximately 2.31e17 Hz.

What is frequency?

Frequency refers to the number of occurrences of a repeating event or phenomenon within a specific time period. In simpler terms, it measures how often something happens or repeats in a given amount of time.

In physics and engineering, frequency is most commonly associated with the concept of waveforms. It represents the number of cycles or oscillations of a wave that occur in one second, and is typically measured in hertz (Hz). One hertz is equivalent to one cycle per second.

To calculate the frequency of light, we can use the equation: c = λν

where c is the speed of light and λ is the wavelength, and ν is the frequency of light.

Given the speed of light c = 3.00x10⁸ m/s, and the wavelength λ = 1.30 Å (1 Å = 1x10⁻¹⁰ m), we need to convert the wavelength to meters before calculating the frequency.

Converting the wavelength to meters:

λ = 1.30 Å × (1x10⁻¹⁰ m/1 Å) = 1.30x10⁻¹⁰m

Now, we can rearrange the equation to solve for the frequency:

ν = c/λ

Substituting the values, we have:

ν = (3.00x10⁸ m/s) / (1.30x10⁻¹⁰ m) = 2.31x10¹⁷Hz

Therefore, the frequency of light with a wavelength of λ = 1.30 Å is approximately 2.31e17 Hz.

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Complete question:

Calculate the following conversions (c = 3.00x108m/s): Where applicable enter in scientific notation with 3 sig figs, such as 1.23e10 for 1.23x1010)

What is the frequency ofLaTeX: \lambdaλ = 1.30 Angstrom?

The solubility of silver carbonate in water at 25°C is approximately

1.28 x 10⁻⁴ g/L

To calculate the solubility of silver carbonate (in water at 25°C, we need to use the solubility product constant (Ksp) and the balanced chemical equation for the dissociation of silver carbonate.

The balanced chemical equation for the dissociation of Ag2CO3 is

Ag₂CO₃(s) ⇌ 2Ag+(aq) + CO₃²-(aq)

Using the Ksp expression for Ag₂CO₃

Ksp = [Ag+]² [CO3²-]

substituting the equilibrium concentrations:

8.4 x 10⁻¹² = (2x)² * x

Simplifying the equation

8.4 x 10⁻¹² = 4x³

2.1 x 10⁻¹²  = x³

taking the cube root of both sides

x ≈ 1.28 x 10⁻⁴ g/L

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The example of velocity from the question is 10 m/s to the right

Velocity is a measure of the rate of change of an object's position with respect to time. It is a vector quantity, which means it has both a magnitude (speed) and a direction.

Mathematically, velocity is defined as the change in displacement (change in position) divided by the change in time:

Velocity = Δ displacement / Δ time

Alternatively, velocity can be expressed as the derivative of an object's position with respect to time:

Velocity = d displacement / d time

the  SI unit of velocity or it is measured in  meters per second (m/s).

Therefore, This statement specifies both the magnitude (10 m/s) and the direction (to the right) of the object's velocity. It indicates that the object is moving at a constant speed of 10 meters per second in the direction of the positive x-axis.

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Answer: rarefaction

Explanation: correct answer on a p e x

Rarefaction term describes an area of low density in a longitudinal wave.

Wave is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform.

There are two types of the wave longitudinal wave and transverse wave. Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave. Sound wave is a longitudinal wave. Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave. Light wave is a transverse in nature wave.  

In Longitudinal wave, wave carries energy and momentum with compression and rarefaction. Compression is region of high density, in this region particles of the medium is compressed. rarefaction is region of expansion and it is low density region of longitudinal wave.

Hence option C is correct.

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Answer:

P = E / t      definition of power

P = (1/2 m v2^2 - 1/2 m v1^2) / t

P = m / (2 * t) * (v2^2 - v1^2)

P = 1300 kg / 6 sec * (17.9^2 - 13.4^2)

P = 217 * 141 = 30,600 J/sec

The power required to pass the slow-moving truck is 34,905 watts.

Power is a physical quantity that measures the rate at which work is done or energy is transferred. It is defined as the amount of energy transferred or work done per unit time. The SI unit of power is watts (W), which is equivalent to joules per second (J/s).

In simpler terms, power is the rate at which energy is used or work is done. It is a measure of how quickly something can accomplish a certain task or transfer energy. The greater the power of a system, the faster it can perform a given amount of work.

Power = Work done / time taken = Force x distance/time taken

Here in the Question,

To calculate the power required to pass the slow-moving truck, we need to use the formula:

Power = Force x Velocity

where Force is the net force acting on the car and Velocity is the final velocity of the car after acceleration.

To find the force, we can use Newton's second law of motion:

Force = mass x acceleration

where mass is the mass of the car and acceleration is the change in velocity over time.

Given:

Initial velocity, u = 13.4 m/s

Final velocity, v = 17.9 m/s

Time, t = 3 s

Mass of car, m = 1300 kg

The acceleration can be calculated using the formula:

Acceleration = (Final velocity - Initial velocity) / Time

Acceleration = (17.9 m/s - 13.4 m/s) / 3 s

Acceleration = 1.5 m/s^2

Now we can calculate the force:

Force = mass x acceleration

Force = 1300 kg x 1.5 m/s^2

Force = 1950 N

Finally, we can calculate the power required to pass:

Power = Force x Velocity

Power = 1950 N x 17.9 m/s

Power = 34,905 W

Therefore, the power required to pass the slow-moving truck is 34,905 watts (or approximately 35 kW).

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80Sec or 1.33 min time taken by train to cross a bridge with a uniform speed of 36 kmph.

Given data,

length of bridge = 600m

length of train = 200m

Length of bridge + Length of train is the total distance travelled by train to cross the bridge.

So, 600+200 = 800m = 0.8km

Now, applying the formula for time,

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

\(time = \frac{0.8}{36}\)

time = 0.022hours

time in seconds= 0.022×60×60

time in seconds= 1.33×60

time in seconds= 80seconds

Therefore, 80Sec or 1.33 min time taken by train to cross a bridge with a uniform speed of 36 kmph.

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Explanation:

weight of the piano = mg

w = 99 x 10 =990 N

The longest wavelength of light that will produce photoelectrons from potassium is approximately 310 nm.

This wavelength corresponds to the threshold energy required to overcome the work function of potassium and release electrons via the photoelectric effect. The photoelectric effect occurs when photons of light strike a material, causing the ejection of electrons. The minimum energy required to liberate electrons is determined by the work function of the material. For potassium, the work function is around 2.24 eV. By converting this energy to wavelength using the formula E = hc/λ (where E is energy, h is Planck's constant, c is the speed of light, and λ is the wavelength), we find that the longest wavelength is approximately 310 nm. At wavelengths longer than this, the energy of the photons is insufficient to produce photoelectrons from potassium.

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The Carnot refrigerator delivers approximately 64.84375 Joules of heat energy to the reservoir at 320 K, The power input required to operate the Carnot refrigerator is 68325 Joules per minute,  the coefficient of performance (COP) of the Carnot refrigerator is approximately 0.0136.

To solve this problem, we can use the principles of the Carnot refrigerator and the equations associated with its operation.

(a) The Carnot refrigerator operates in a cycle transferring heat from the cold reservoir to the hot reservoir. The efficiency of a Carnot cycle is given by:

η = 1 - (T_cold / T_hot)

where η is the efficiency, T_cold is the temperature of the cold reservoir, and T_hot is the temperature of the hot reservoir.

Since we know the temperatures of the reservoirs (T_hot = 320 K and T_cold = 270 K), we can calculate the efficiency:

η = 1 - (270 / 320)

  = 1 - 0.84375

  = 0.15625

The efficiency of the Carnot refrigerator is 0.15625, which means that it delivers only a fraction of the input energy as useful work.

Now, let's calculate the amount of heat energy delivered to the hot reservoir. Since the efficiency of the Carnot cycle is the ratio of useful work output to heat input from the cold reservoir, we can write:

η = Q_hot / Q_cold

where Q_hot is the heat energy delivered to the hot reservoir and Q_cold is the heat energy received from the cold reservoir.

Rearranging the equation, we get:

Q_hot = η * Q_cold

      = 0.15625 * 415 J

      = 64.84375 J

Therefore, the Carnot refrigerator delivers approximately 64.84375 Joules of heat energy to the reservoir at 320 K.

(b) Power is defined as the rate at which work is done or energy is transferred. Since the refrigerator completes 165 cycles each minute, we can calculate the power input as follows:

Power = Energy transferred per cycle * Number of cycles per minute

We already know the energy transferred per cycle, which is 415 J. Therefore:

Power = 415 J/cycle * 165 cycles/min

     = 68325 J/min

The power input required to operate the Carnot refrigerator is 68325 Joules per minute.

(c) The coefficient of performance (COP) of a refrigerator is defined as the ratio of useful cooling effect (heat energy delivered to the hot reservoir) to the work input. Mathematically, it can be expressed as:

COP = Q_hot / Power

Using the values we obtained earlier:

COP = 64.84375 J / 68325 J/min

To convert the power from J/min to J/s (Watts), we divide by 60:

COP = 64.84375 J / (68325 J/min) * (1 min/60 s)

     = 0.01551 J/s / 1138.75 W

     ≈ 0.0136

Therefore, the coefficient of performance (COP) of the Carnot refrigerator is approximately 0.0136.

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The color of visible light that would have the least energy is red. On the other hand, the color of visible light that would have the most energy is violet.

This is because red light has the longest wavelength and the lowest frequency out of all the colors in the visible spectrum. Violet light has the shortest wavelength and the highest frequency out of all the colors in the visible spectrum.

This relationship between wavelength, frequency, and energy can be explained by the relationship between electromagnetic waves and energy. All electromagnetic waves, including visible light, have a certain amount of energy that is proportional to their frequency. The higher the frequency, the more energy the wave has.

This relationship can also be seen in the electromagnetic spectrum, where higher energy waves (such as X-rays and gamma rays) have shorter wavelengths and higher frequencies, while lower energy waves (such as radio waves) have longer wavelengths and lower frequencies.

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Answer:

Reflective clothing. So vehicles can see them and stuff.

the Carnot efficiency and how it relates to temperature. The Carnot efficiency is the maximum possible efficiency of a heat engine operating between two temperatures, and it is calculated by dividing the difference in temperature between

the hot and cold reservoirs by the temperature of the hot reservoir. This is expressed as:aEfficiency = (Th - Tc) / Th
Where Th is the temperature of the hot reservoir and Tc is the temperature of the cold reservoir.To achieve a Carnot efficiency of 30%, we need to solve for Th in the equation above. Rearranging the equation, we get:


where T_low is the low temperature, T_high is the high temperature, and the efficiency is expressed as a decimal (i.e., 30% = 0.3). We need to solve for T_high: 0.3 = 1 - (T_low / T_high)We don't have a specific value for T_low in the question, so let's assume T_low = 273 K, 0°C.Now, we can solve for T_high: 0.3 = 1 - (273 / T_high)0.3 * T_high = 273T_high = 273 / 0.3T_high ≈ 910 K this value is not among the provided options. Without knowing the exact value of T_low, we can't determine which option is correct. To we would need more information about the system or the value of T_low.

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Answer:

150J (joules)

Explanation:

25% efficiency of 1000J = 250J

40% efficiency of 1000J= 400J

400-250=150

64 people are allowed daily into the coyote buttes north area, which includes the wave.

The Wave and other aesthetically stunning natural sandstone formations can be found in Coyote Buttes North.

It is a small portion of the 112,500-acre Paria Canyon-Vermilion Cliffs Wilderness of Northern Arizona.

How was the wave in coyote buttes formed?

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64 people are allowed daily into the coyote buttes north area, which includes the wave.

The Wave and other aesthetically stunning natural sandstone formations can be found in Coyote Buttes North.

It is a small portion of the 112,500-acre Paria Canyon-Vermilion Cliffs Wilderness of Northern Arizona.

To enter Coyote Buttes North (The Wave) and Coyote Buttes South, you need a permission.

There are only daytime permits available.

Permits have a daily maximum.

Coyote Buttes North (The Wave) permits are distributed via lottery.

The Wave is a Navajo Sandstone formation found in the Paria Canyon-Vermilion Cliffs Wilderness of Northern Arizona.

The amazing patterns in the rock here were created by the wind and erosion over millions of years.

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