he magnification of a convex mirror is 0.57 times for objects 3.6 m from the mirror. part a what is the focal length of this mirror?

Answer:

\(0.741\ \text{m/s}^2\)

Explanation:

v = Velocidad final = \(40\ \text{km/h}=\dfrac{40}{3.6}\ \text{m/s}\)

u = Velocidad inicial = 0

t = Tiempo empleado = 15 s

a = Aceleración

De las ecuaciones cinemáticas tenemos

\(v=u+at\\\Rightarrow a=\dfrac{v-u}{t}\\\Rightarrow a=\dfrac{\dfrac{40}{3.6}-0}{15}\\\Rightarrow a=0.741\ \text{m/s}^2\)

La aceleración del camión en el primer intervalo de tiempo es \(0.741\ \text{m/s}^2\).

Hydrogen is a very reactive gas, and the alkali metals are even more reactive. In fact, they are the most reactive metals and, along with the elements in group 17, are the most reactive of all elements.

Answer:

Explanation:

true

Answer:

Time, t = 10 seconds

Explanation:

Given the following data;

Mass = 10kg

Force = 10N

Final velocity = 10m/s

Initial velocity = 0m/s

To find the time;

First of all, we would find the acceleration of the box.

Force = mass * acceleration

10 = 10 * acceleration

Acceleration = 10/10 = 1m/s²

Now, we can find the time by using the first equation of motion;

V = U + at

10 = 0 + 1t

10 = t

Time, t = 10 seconds

Therefore, it will take 10 seconds for the box to come to a complete stop.

The point at which the Fahrenheit and Celsius scales have the same numerical value is -40°C. The point at which the Fahrenheit and Kelvin scales have the same numerical value is 459.67°F the expansion gap that should be left between the steel railroad rails is 0.0045 m or 4.5 mm.

(a) The point at which the Fahrenheit and Celsius scales have the same numerical value is -40°C. This is because this temperature is equivalent to -40°F.  At this temperature, both scales intersect and meet the same numerical value.
(b) The point at which the Fahrenheit and Kelvin scales have the same numerical value is 459.67°F. At this temperature, both scales intersect and meet the same numerical value.
For the second part of the question:
Given that the original length of the steel railroad rails is 12.5m, the maximum temperature rise is 30℃, and the coefficient of linear expansion (a) is 1.2×10⁻⁵/℃.
Therefore, the expansion ΔL can be calculated as:
ΔL = L×a×ΔT
Where L is the original length of the steel railroad rails, a is the coefficient of linear expansion, and ΔT is the temperature rise.
Substituting the given values, we have:
ΔL = 12.5×1.2×10⁻⁵×30
ΔL = 0.0045 m
Therefore, the expansion gap that should be left between the steel railroad rails is 0.0045 m or 4.5 mm. This gap allows the rails to expand without buckling or bending.

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AnswerThe current through a toaster connected to a 120-V source is 8.0 A. What power is given off by the toaster? p= 8.0 A : 120V (p=960 W Page 2 7. The resistance of an electric stove eleinent at operating temperature is 11 12.

Explanation:

hope this helps =)

Hello!!

For calculate the resistance of the toaster, we have to applicate formula:

\(\boxed{R= V^{2}/P}\)

\(\textbf{Being:}\)

\(\sqrt{}\) \(P = Potency \ power = 1500 \ W\)

\(\sqrt{}\) \(V = Voltage = 120 \ V\)

\(\sqrt{}\) \(R = Resistance = \ ?\)

\(\text{Then let's \textbf{replace it according} we information:}\)

\(R = (120 \ V)^{2} / 1500 \ W\)

\(R = 9.6 \ \varOmega\)

\(\textbf{Result:}\\\text{The power of the toaster is \textbf{9.6 Ohms}}\)

Answer:

Explanation:

V₀ = 0 m/s

V = 41 m/s

S = 480 m

___________

a - ?

Distance traveled:

S =  (V² - V₀²) / (2*a)

Acceleration :

a = (V² - V₀²) / (2*S)

a = (41² - 0²) / (2*480) = 1.75 m/s²

Answer:

0.180

Explanation:

(Applied Force) / (Weight) = Coefficient of kinetic friction

(77.4 N) / (43.8 kg * 9.81 m/s/s) = 0.180

.180 is indeed the correct answer for acellus

La densidad del metal como se requiere en la pregunta es 7.8 * 10 ^ 3 Kg / m ^ 3.

Sabemos que ese empuje hacia arriba = peso en aire - peso en líquido

Peso en el aire = 63,5 * 10 ^ -3 Kg * 10 m / s ^ 2 = 0,635 N

Peso en líquido = 55,4 * 10 ^ -3 Kg * 10m / s ^ 2 = 0,554 N

Empuje hacia arriba = 0,635 N - 0,554 N = 0,081 N

Pero ;

Empuje hacia arriba = Volumen * densidad del fluido * aceleración debido a la gratitud

volumen = empuje hacia arriba / densidad del fluido * aceleración debido a la gratitud

volumen = 0.081 N / 1000 * 10

Volumen = 8.1 * 10 ^ -6 m ^ 3

Densidad = masa / volumen

Densidad = 63,5 * 10 ^ -3 Kg / 8,1 * 10 ^ -6 m ^ 3

= 7,8 * 10 ^ 3 kg / m ^ 3

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Answer:

Explanation:

Yes, translations are rigid transformations. You can verify that the distances between the points are preserved.

Answer:

True

Explanation:

In translation, all points of the figure move the same distance and in the same direction. The shape and size of the image remains the same as the preimage

Answer:

Even in space, objects have mass. And if they have mass, they have inertia. That is, an object in space resists changes in its state of motion. A force must be applied to set a stationary object in motion.

To determine the calculated -3dB frequency of a filter that reduces its amplitude the most, we need to consider the filter's type, order, and design parameters. The specific frequency will vary depending on these factors and the desired frequency response of the filter.

A -3dB frequency, also known as the cutoff frequency, is the frequency at which a filter's output power is reduced by half (-3dB) compared to its input power. It is a critical parameter for filters as it determines the frequency range in which the filter will pass signals with minimal attenuation and reject signals outside of that range.


To determine the calculated -3dB frequency of a filter that reduces its amplitude the most, we need to know the type of filter being used, its order, and its design parameters.

Similarly, a high-pass filter with a cutoff frequency of 500Hz will attenuate frequencies below 500Hz more significantly than frequencies above 500Hz. Again, increasing the filter's order will result in a steeper rolloff and greater amplitude reduction.

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The correct definition of kinetic energy is that kinetic energy is the energy an object has due to its motion.

It is defined as the work needed to accelerate an object from rest to its current velocity. Kinetic energy is proportional to the mass of the object and the square of its velocity and can be calculated using the formula KE = 0.5 × m × v², where m is the mass of the object and v is its velocity.

Kinetic energy is a scalar quantity and has units of joules (J) in the SI system. It is an important concept in physics and has a wide range of applications, from understanding the motion of objects in classical mechanics to describing the behavior of particles in thermodynamics and quantum mechanics.

Therefore, The correct definition of kinetic energy is that kinetic energy is the energy an object has due to its motion.

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False.

Thermal energy is usually transferred in fluids by convection, which is the transfer of heat through the movement of fluids (such as liquids or gases).

What is Thermal Energy?

Thermal energy is the energy that is generated by the movement of atoms or molecules within a substance. It is a form of kinetic energy that is related to the temperature of the substance, and it is transferred from one object to another as a result of a temperature difference.

Convection occurs when a warmer fluid or object is in contact with a cooler fluid or object, causing the warmer fluid to transfer its thermal energy to the cooler one.

Radiation, on the other hand, is the transfer of thermal energy through electromagnetic waves, and it can occur in fluids as well as in solids and gases. However, radiation is generally less efficient in fluids than in solids or gases, and it is not the primary method of thermal energy transfer in fluids.

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Answer: static stretching

Explanation:

e.g rubberband

Answer:

static stretching

Explanation:

The Earth's atmosphere is divided into several layers, each with different characteristics that affect the types of wavelengths that are reflected, absorbed, or allowed to pass through to Earth's surface.

The first layer closest to Earth's surface is the troposphere, which contains most of the Earth's weather. This layer is characterized by decreasing temperature with altitude and contains water vapor, carbon dioxide, and other greenhouse gases. These gases absorb and re-emit certain wavelengths of radiation, such as infrared radiation, which are trapped within the atmosphere, leading to the greenhouse effect. This helps to keep the Earth warm, but too much of this effect can lead to global warming and climate change.

The next layer is the stratosphere, which contains the ozone layer. Ozone absorbs harmful ultraviolet radiation from the sun, preventing it from reaching the Earth's surface. This layer allows visible light and some infrared radiation to pass through.

Above the stratosphere is the mesosphere, where most meteoroids burn up upon entering the Earth's atmosphere. This layer absorbs most of the incoming radiation and reflects some of it back into space.

Finally, the thermosphere is the outermost layer of the Earth's atmosphere, where the temperature increases with altitude due to the absorption of high-energy solar radiation. The ionosphere, a sub-layer of the thermosphere, contains ions and free electrons that can reflect and scatter radio waves, making long-range communication possible.

Overall, the characteristics of each atmospheric layer affect the types of wavelengths that are reflected, absorbed, or allowed to pass through to the Earth's surface. The amount of radiation absorbed or reflected by each layer can also affect the Earth's climate and weather patterns.

The infrared spectrum is divided into three regions: the near-infrared, mid-infrared, and far-infrared regions. Among these, the mid-infrared region is the most widely used for molecular identification. Within the mid-infrared region, the fingerprint region is considered to be the range between 4000 cm-1 to 1400 cm-1.

This range is known as the fingerprint region because it contains a unique set of absorption bands that are specific to the functional groups present in a molecule. These absorption bands are like fingerprints, which can be used to identify and differentiate between different molecules.

The fingerprint region is particularly useful in identifying complex molecules, such as proteins, carbohydrates, and nucleic acids. Therefore, the fingerprint region is an essential tool in the field of infrared spectroscopy, which is widely used in chemical and biomedical research.

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Given data

*The given resistor is R = 12 ohms

*The given voltage is V = 120 V

The formula for the current flows in the circuit is given as

Substitute the values in the above expression as

Thus, the amount of current flows in the circuit is I = 10 A

Answer:

300

Explanation:

when the baby are born then they would have 300 bones but when they grow they would have 206 cause when they grow that 94 bones would convert into different kind of proton and energy I guess

The transfer of warmth (heat) from one item to another is known as heat conduction. Therefore, we can witness heat or thermal conduction when two things with differing temperatures come into touch.

Thus, The heat transfers from the hotter (the cup) to the colder (our hands) object when we contact the hot cup. When we added hot water to the cup that was at normal temperature, thermal conduction also took place.

The object's temperature is actually a measurement of how quickly its atoms are moving. The total energy produced by the atoms' vibrations is measured by the heat.

As a result, the atoms inside it begin to travel more quickly, which inevitably raises the likelihood that they will collide and conduction. It also relies on the density of the material we are working with how much they will clash.

Thus, The transfer of warmth (heat) from one item to another is known as heat conduction. Therefore, we can witness heat or thermal conduction when two things with differing temperatures come into touch.

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The probability that a neutron emitted by the source escapes from the surface is P = No.leaking/sec / S = (R+d)/L sin h((R+d)/L)

The flux of neutrons in the sphere can be calculated using the diffusion equation and the boundary conditions. The solution is given by:

phi(r) = S/4πD [1 - (r/R) sin h(R/d) sin h((r-d)/L)]

where D is the diffusion coefficient, and d is the thickness of the boundary layer. By simplifying the equation and using trigonometric identities, we can rewrite it as:

phi(r) = S/4 [sin h((R+d)/L) sin h((R+d-r)/L)]/r

This is the desired expression for the flux.

To calculate the number of neutrons leaking per second from the surface, we integrate the flux over the surface area of the sphere. The result is:

No.leaking/sec = (R+d)S/L sin h((R+d)/L)

This expression gives the rate of leakage of neutrons from the surface.

The probability that a neutron emitted by the source escapes from the surface is the ratio of the leaking neutrons to the total number of neutrons emitted per second. Therefore, the probability is:

P = No.leaking/sec / S = (R+d)/L sin h((R+d)/L)

This gives the probability of a neutron escaping from the surface as a function of the sphere's radius and diffusion length.

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Answer:

velocity= 135m/s

Explanation:

velocity = 300×0.45

= 135m/s²

Answer:

220,500 Joules

Explanation:

PE = (75 kg) x (9.8 \(m/s^{2}\)) x (300 m)

PE = (735) x (300)

PE = 220,500 Joules

Answer:

googli moogli

Explanation:

Answer:

Gravity - is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another.

Strong Interaction - is the mechanism responsible for the strong nuclear force

Weak Interaction - is the mechanism of interaction between subatomic particles that is responsible for the radioactive decay of atoms

Electromagnetism - is a branch of physics involving the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles.

Hope this helps!

The distance of the object is 12.27m

We are given that,

The net force = F = 6.6N

The mass = m = 9.0kg

The velocity of the object = v = 3.0m/s

Therefore , the hamster is travelled distance ,that can be calculated by Newton's second law of motion,

F = ma

F = (mv²)/r

r = (mv²)/F

Putting the above values in the given equation,

r = (9.0kg)(3.0m/s)²/6.6N

r = 12.27m

Therefore, the hamster travelled 12.27m.

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Answer: = 25. 5 m

Explanation:

Solve for C using Pythagorean theorem:

1. \(\sqrt{a^{2}+b^{2} }=c\)

2.  \(\sqrt{22.2 m ^{2} +12.6m^{2} } =c\)

3. \(25.52646 m= c\)

∴ Magnitude of the vector is 25.5 m

The fuse rating in the plug of the electric device should be 4 amperes.

An ampere can be defined as a unit of measure of the rate of electron flow or current in an electrical conductor.

To calculate the fuse rating in amperes for an electric device with a power rating of 1 kW connected to a mains voltage of 250 V, we can use the formula:

P = IV

Where

In this case, we have P = 1000 W (since 1 kW = 1000 W) and V = 250 V. Solving for I, we get:

I = P/V = 1000 W / 250 V = 4 A

Therefore, the fuse rating in the plug of the electric device should be 4 amperes.

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Answer:

0.25 amps

Explanation:

V = IR

125 = I(500)

I = 0.25 amps

Answer:

\(15\:\mathrm{J}\)

Explanation:

The potential energy of an object is given by \(PE=mgh\).

Recall that the weight of an object is equal to the force of gravity on the object. From this, we can set up the following equation and solve for the mass of the object:

\(F=mg,\\5=mg,\\m=\frac{5}{9.81}\approx 0.51\:\mathrm{kg}\)

Now we can plug in values to \(PE=mgh\) and solve:

\(PE=0.51\cdot9.81\cdot3=\fbox{$15\:\mathrm{J}$}\).

Answer:

The potential energy of the body is 15J.

Explanation:

The energy possessed to a body due to position is called Potential energy.

U=mgh

U=mgh

U=5×3=15J

Hence, the potential energy of the body is 15J.

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Answer: \(-\frac{1}{2}\times \frac{d[Br^.]}{dt}=+\frac{d[Br_2]}{dt}\)

Explanation:

Rate of a reaction is defined as the rate of change of concentration per unit time.

Thus for reaction:

\(2Br^.\rightarrow Br_2\)

The rate in terms of reactants is given as negative as the concentration of reactants is decreasing with time whereas the rate in terms of products is given as positive as the concentration of products is increasing with time.

\(Rate=-\frac{d[Br^.]}{2dt}\)

or \(Rate=+\frac{d[Br_2]}{dt}\)

Thus \(-\frac{d[Br^.]}{2dt}=+\frac{d[Br_2]}{dt}\)