The specific heat capacity of iron is 450.5. A 15.5 kg block of iron with

an initial temperature of 20 degrees Celsius is heated with 250 J. What will

the final temperature of the iron be?

The duty cycle of a square wave with a frequency of 10 Hz and a positive pulse width (i.e., high time) of 0.03 seconds is 30%.

The duty cycle is defined as the percentage of time the waveform spends at the high voltage level. To calculate the duty cycle of a square wave, divide the high time by the total period, then multiply by 100. The duty cycle equation is as follows:Duty cycle (%) = (High time / Period) * 100Where,High time is the time duration when the waveform is at a high level.Period is the time duration between the beginning of two consecutive high levels. Frequency is the inverse of the period.The high time is 0.03 seconds, and the period is 1 / 10 = 0.1 seconds, using the frequency given. As a result, the duty cycle can be calculated:Duty cycle = (0.03 / 0.1) * 100 = 30%Thus, the duty cycle of a square wave with a frequency of 10 Hz and a positive pulse width (i.e., high time) of 0.03 seconds is 30%.

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The lateral area of the prism is 98 square inches and the surface area is 122 square inches.

To find the lateral area and surface area of a right rectangular prism with height 7 inches, length 3 inches, and width 4 inches, we can use the following formulas:

Lateral area = 2h(l + w)

Surface area = 2lw + 2lh + 2wh

Plugging in the given values, we get:

Lateral area = 2(7)(3 + 4) = 2(7)(7) = 98 square inches

Surface area = 2(3)(4) + 2(3)(7) + 2(4)(7) = 24 + 42 + 56 = 122 square inches

Therefore, the lateral area of the prism is 98 square inches and the surface area is 122 square inches.

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The car's interior, like the Earth's, absorbs visible light and infrared radiation, then emits infrared radiation back out.

c. Visible light and infrared rays can enter the car through the windows. Similar to how visible light and infrared radiation can pass through our atmosphere. a. Similar to how a car's exterior reflects some incoming radiation, the polar ice caps do the same. b. Just like the Earth, the interior of the car collects visible light and infrared radiation before reemitting it. d. The automobile gets hotter since none of the radiation can get through the windows. Similar to how part of the radiation that the Earth emits is trapped in the atmosphere, global warming results.

Order correctly: Visible light and infrared radiation can enter the car through the windows.

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A measure of how quickly a conductor moves across a field. The voltage induced increased as the conductor moved through the field more quickly. The induced voltage and speed are directly inversely proportional.

Current can only flow when a circuit is closed or complete, hence, unless the circuit is completed current will not flow

What is Electro-Magnetic Induction?

This a phenomenon whereby a wound wire or a soft core of conductor made to cut across magnetic line of force and an E.M.F is generated, this E.M.F forces current to flow if the circuit is completed.

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Answer:

Density is the degree of compactness in an object.

Explanation:

S.I unit is kg/m3

Answer:

The mass of the paraffin is 70g

Explanation:

You have to subtract the mass of the empty beaker from that of the empty beaker and paraffin oil to get the mass of the paraffin oil

In every energy transfer and transformation, some energy is transformed into _____ ______

Answer:

Thermal Energy

The image is inverted and real because the question tells us that the image was formed on a screen.

When the rays come together, a true image is created. A virtual image is always formed above the principal axis, therefore it is always upright, as opposed to a real image, which is always formed below the principal axis and is always inverted.

An image that can be projected onto a screen is a real image. Behind the lens, a virtual image appears to emerge.

The image is inverted, magnified, and real for an object that is between one and two focal lengths from the lens.

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Answer:

The temperature of the gas is 350.02 K.

Explanation:

The average speed is related to the temperature as follows:

\( \bar v = \sqrt{\frac{3RT}{M}} \)   (1)

Where:

\( \bar v \): is the average speed = 1477 m/s

R: is the gas constant = 8.31 J/(K*mol)                                                  

T. is the temperature =?

M: is the molar mass

First, let's find the molar mass:

\( M = \frac{m}{n} \)

Where:

m: is the mass of the gas = 0.008 kg

n: is the number of moles = 2 mol

\( M = \frac{m}{n} = \frac{0.008 kg}{2 mol} = 0.004 kg/mol \)

Hence, by solving equation (1) fot T we have:

\( T = \frac{\bar v^{2}*M}{3R} = \frac{(1477 m/s)^{2}*0.004 kg/mol}{3*8.31 J/(K*mol)} = 350.02 K \)

Therefore, the temperature of the gas is 350.02 K.

I hope it helps you!            

Two vinyl balloons with an identical charge are given a separation distance of 52 cm. The balloons experience a repulsive force of 2.74x10³ N. then  magnitude of charge on each one of the balloons is

According to the law, the strength of the electrostatic force of attraction or repulsion between two point charges is inversely proportional to the square of the distance between them and directly proportional to the product of the magnitudes of the charges. Coulomb investigated the repellent force between things with identical electrical charges:

Given,

F = 2.74x10³ N.

r = 52 × 10 ⁻² m

Coulomb's law is given by,

F = q₁q₂ ÷ 4π∈r²

2.74x10³ N = q₁q₂ ÷ 4π 8.85×10⁻¹² × (52 × 10 ⁻²)²

2.74x10³ N = q₁q₂ ÷ 3 × 10⁻¹¹

q₁q₂ = 2.74x10³ ×  3 × 10⁻¹¹

q² = 8.2 × 10⁻⁸

q = 2.8 × 10⁻⁴ C

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Answer:

8.14n in mars

Explanation:

gravitational

Answer:

W= 6×1=6J

Explanation:

The energy gained by 72C of charge passing through a 5V battery can be calculated using the formula E = QV, resulting in an energy gain of 360 Joules.

The energy gained by a charge when it passes through a potential difference (voltage) can be calculated using the formula E = QV, where E is the energy in joules, Q is the charge in coulombs and V is the voltage in volts. So in this case, if 72 C of charge is passing through a 5 V battery, then energy gained would be E = 72 C * 5 V = 360 Joules.

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Answer:

C. Wedge

Explanation:

Answer:

GIVE THE PERSON ABOVE BRAINLIEST UwU

Explanation:

Scenario:

John is a 25-year-old athlete who participates in high-intensity sports such as basketball and soccer. During a recent soccer game, he experienced a sudden twist in his right knee while trying to change direction. He immediately felt a sharp pain in the knee and was unable to continue playing. John had a previous history of minor knee injuries but never experienced anything as severe as this.

Observations:

Upon examination, John is visibly in pain and favors his right leg. He has difficulty bearing weight on the injured leg and walks with a noticeable limp. Swelling is observed around the right knee, and the area appears slightly discolored. John describes the pain as a combination of sharp and throbbing sensations, localized around the inner side of the knee joint.

Palpation Findings:

Palpation of the knee reveals tenderness and increased warmth around the medial collateral ligament (MCL) area. There is also some localized swelling and a noticeable loss of stability in the joint. A popping sensation is reported by John at the time of injury.

Current Status of Range of Motion and Strength:

John experiences a limited range of motion in his right knee, particularly when attempting to fully extend or bend the joint. Flexion is painful and restricted. He also feels weakness in his right leg and struggles to perform simple tasks such as squatting or walking up stairs.

Possible Diagnosis:

Based on the history, observations, palpation findings, and current status, it is possible that John has suffered a medial collateral ligament (MCL) sprain or tear in his right knee. The twisting motion during the game may have caused excessive stress on the MCL, resulting in damage to the ligament. The pain, swelling, limited range of motion, and instability are consistent with MCL injury. Further diagnostic tests such as X-rays or an MRI may be necessary to confirm the diagnosis and determine the severity of the injury.

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A) The electric field at 1.0 cm above the center of the sheet is 2.5 × 10⁵ N/C, B) the electric field 15 m above the center of the sheet is 11 N/C.

Side of the square sheet, l =25 cm = 0.25 m

Uniformly distributed charge, Q = 275 × 10⁻⁹ C

ε₀ = 8.8 × 10⁻¹²

a) When close to the sheet, we assume it as an infinite sheet, So,

E = σ/2ε₀,

σ = Q/l²

E = Q/(2ε₀l²)

E = (275 × 10⁻⁹)/(2×8.8 × 10⁻¹²×0.25²)

E = 2.5 × 10⁵ N/C

B) When far from the sheet, we assume it as a point charge, if R = 15 m

E = Q/(4πε₀R²)

E = (275 × 10⁻⁹)/(4π×8.8 × 10⁻¹²× 15²)

E = 11 N/C

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Answer:

Bacteria

Fungi

Viruses

Parasites

An ideal solenoid has an inductance of 6.8 mh. to generate an EMF of 2.6 v, The current should change at a rate of 2.62 * \(10^{-3}\) A / second

induced EMF in a solenoid = -L * (di/dt)

∈ = -L * (di/dt)

di/dt = - L / ∈

       = - 6.8 * \(10^{-3}\) / 2.6

       = - 2.62 * \(10^{-3}\) A / second

The current should change at a rate of 2.62 * \(10^{-3}\) A / second

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It is true that we can only perform ideal calculations under normal pressure and temperature.

The nominal air temperature at sea level are referred to as STP, or normal temperature and pressure. The conditions are 0 °C and 1 atmosphere of pressure, respectively.

It is now simpler to compare various measures for gasses, such as the number of molecules of gas in a certain volume. For scientists to be able to compare different sets of data in a meaningful way, a global standard for temperature and pressure must be established.

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Answer:

360J

Explanation:

In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.

Answer:

It will need 20 Watts power to move the box 5 meters in 5 seconds.

Step-by-step explanation:

The power is defined as the work per unit time or the rate of doing work:

W=dL/dt

Where de work L, can be calculated by multiplying the force by the displacement d:

L=F.d

To this example, F and D are known, therefore the work is:

L=20N . 5m=40 Nm

We know that the work is doing within a time of 5 seconds:

W= 40 Nm / 5s = 20 Nm/s = 20 Watts

"Consciousness is everything.  Consciousness and "conscious" are catch-all terms that refer to a wide range of mental events. Both have a variety of connotations, and the word "conscious" is used to describe both specific mental states and processes (state consciousness) as well as entire creatures (creature consciousness).

Your distinctive awareness of your own thoughts, memories, emotions, sensations, and surrounds is what is known as consciousness. Being aware of oneself and one's surroundings is the essence of consciousness.

This awareness is personal to you and subjective. It is a sign that something is a part of your consciousness if you can verbalize what you are experiencing.

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The position of the image relative to the mirror v = 20cm, position of the image behind the mirror.

Since object is always placed in front of the mirror

Hence, object distance will be negative

Object distance (u) = - 100cm

Focus of a convex mirror is behind the mirror

Hence focal length will be positive

Focal length (f)= + 25cm

Find position of the image

Let the image distance = v

Using formula,

\(\frac{1}{v}\) +\(\frac{1}{u}\) = \(\frac{1}{f}\)

\(\frac{1}{v}\) = \(\frac{1}{f} - \frac{1}{u}\)

\(\frac{1}{v} = \frac{1}{25} - \frac{1}{-100}\)

\(\frac{1}{v} = \frac{1}{25} + \frac{1}{100}\)

\(\frac{1}{v} = \frac{4 + 1}{100}\)

\(\frac{1}{v} = \frac{5}{100}\)

v = \(\frac{100}{5}\)

v = 20cm

Since v is positive

Hence, image is 20cm behind the mirror

Nature of image is Virtual and erect.

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Answer:

true

Explanation:

they can cause skin damage

Answer:

Hypermetropia (hyperopia, long-sightedness or far- sightedness) is a form of refractive error in which parallel rays of light coming from infinity are focused behind the light sensitive layer of the retina, when the eye is at rest.5 Dec 2017

Explanation:

thank me later

Specific elements can be identified in a particular spectra through a process called spectral analysis.

Each element has a unique set of energy levels, which correspond to the specific wavelengths of light they can absorb or emit. When an element is excited, such as by heating or applying an electric current, it releases energy in the form of light, this emitted light creates a spectrum, which is a pattern of wavelengths specific to that element. Spectroscopy is the technique used to study these spectra. When light from an excited element is passed through a spectrometer, the light is separated into its constituent wavelengths, creating a characteristic pattern called an emission spectrum.

Conversely, when light is passed through a cool gas of the element, certain wavelengths are absorbed, resulting in an absorption spectrum. By comparing these spectra to known patterns of elements, scientists can accurately identify the elements present in the sample. In summary, specific elements can be identified in a particular spectrum by analyzing their unique patterns of emitted or absorbed light wavelengths through spectroscopy. By comparing these patterns to known emission or absorption spectra of various elements, one can determine the composition of the sample being analyzed, this technique has numerous applications, including the study of chemical reactions, analysis of environmental samples, and even determining the elemental composition of stars and distant celestial objects.

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The temperature of the pan after 20 minutes will be 28°F (rounded to the nearest integer).

According to Newton's Law of Cooling, a body with temperature T, when placed in surroundings with temperature To, which is different from that of Tg, the body will either cool or warm to temperature T(t) after t minutes, where T(t) = To + (T, - Tole - kt. A metal pan with a temperature of 155°F is placed in a freezer with a temperature of 0°F. After 15 minutes, the temperature of the pan is 46°F. To determine the pan's temperature after 20 minutes, Newton's Law of Cooling can be used.

Therefore,

T(t) = To + (T, - Tole - kt

where t is the time taken, T(t) is the temperature of the body at time t, To is the temperature of the surroundings, T, is the initial temperature of the body, k is a constant, and Tole is the constant time elapsed.

To calculate the constant k,

46 = 0 + (155 - 0)e-k(15)

k = -0.0409

Now, we can determine the temperature after 20 minutes as,

T(20) = 0 + (155 - 0)e(-0.0409 × 20)

T(20) = 0 + (155 - 0)e(-0.818)

T(20) = 28°F

Therefore, the temperature of the pan after 20 minutes will be 28°F (rounded to the nearest integer).

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The 2nd note will have a higher frequency or pitch.

Explanation:

The frequency of a standing wave in a string is given by

\(f = \frac{ \sqrt{ \frac{t}{ (\frac{m}{l} )} } }{2l} \)

where t = tension of the string

m/l = mass density of the string

l = length of the string

By placing your finger on the string, you increase the tension and at the same time, shorten the length of the string, thereby increasing the frequency of the sound due to the standing wave produced on the string.

Answer:

900 windings

Explanation:

Applying,

Vs/Vp = Ns/Np............. Equation 1

Where Vs = Secondary voltage, Vp = primary voltage, Ns = Number of turns in the secondary circuit, Np = number of turns in the primary circuit

make Ns the subject of the equation

Ns = VsNp/Vp........... Equation 2

From the question,

Given: Vs = 240 V, Np = 300 windings, Vp  = 80 V

Substitute these values into equation 2

Ns = (240×300)/80

Ns = 900 windings