Materials having resistance changes as voltage or current varies are called:

The statement that best describes what occurs as the water boils is Thermal energy is increasing, and temperature is constant, therefore the correct option is B.

It is a temperature at which the pressure exerted by the external atmosphere is equal to the vapor pressure of the substance.

The boiling point depends on atmospheric pressure, temperature, bond strength, and vapor pressure of the liquid.

When the water boils by utilizing the latent heat at 100 degrees Celcius, the phase of the water is changing at a constant temperature, the phase change of water from liquid to gaseous state happens because of the increase in the thermal energy required in the form of latent heat.

Thus, The sentence that best sums up what happens when water boils is option B because thermal energy is rising and temperature is staying the same.

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Final answer:

The correct description of what occurs as water boils is that B.thermal energy increases while temperature remains constant. This is due to the ongoing phase transition from liquid to gas, which requires energy to overcome intermolecular bonds.

Explanation:

The statement that best describes what occurs as water boils is that thermal energy is increasing, and temperature is constant. When water boils, the temperature remains constant at the boiling point because extra energy is used to convert the liquid into gas, thus breaking the intermolecular bonds. This is an example of a phase transition, where the phase change occurs at a fixed temperature, which is a physical property known as the boiling point.

Heat is added continuously, but instead of increasing the temperature, it provides the energy necessary for the phase transition from liquid to gas. During this process, known as boiling, the temperature remains constant at the boiling point while the state of the matter changes. The energy absorbed during boiling contributes to the increase in potential energy of the molecules, facilitating the liquid-to-gas phase transition.

Answer:As the air bubbles rise to the surface, the pressure on them decreases. This decrease in pressure allows the air to expand and each bubble increases in size. Boyle’s law explains why this occurs.

Explanation:

Answer:

4.0

Explanation:

The image distance from the lens is 22.5 cm, and the height of the image is -6.25 cm indicating it is inverted.

To determine the distance of the image from the lens and the height of the image, we use the lens formula and magnification formula.

Lens formula:

[tex]1/f = 1/d_o + 1/d_i[/tex]

Given:

Substitute the values:

[tex]1/10 = 1/18 + 1/d_i[/tex]

[tex]1/d_i = 1/10 - 1/18 = 0.1 - 0.0556 = 0.0444[/tex]

[tex]d_i = 22.5 cm[/tex]

So, the image distance from the lens is 22.5 cm.

Next, we calculate the height of the image using the magnification formula:

Magnification (m) = [tex]-d_i/d_o = h_i/h_o[/tex]

Given:

[tex]h_i = h_o * (-d_i/d_o)[/tex]

Substitute the values:

[tex]h_i[/tex] = 5 * (-22.5/18)

[tex]h_i[/tex] = -6.25 cm

Therefore, the height of the image is -6.25 cm which indicates the image is inverted.

Ans: C) 300,000 kilometers per second

Electromagnetic waves are created by the movement of charges. This results in the generation of electric and magnetic fields which oscillate in a direction perpendicular to each other.

Electromagnetic waves carry a certain wavelength, frequency and speed. The speed of such waves as they travel through space is equal to the speed of light (c) = 3*10⁸ m/s

since 1 km = 10³ m

speed, c = 1 km * 3*10⁸ ms-1/10³ m

                = 300, 000 km/s

Hello. This question is incomplete. The complete question is:

"Which statement best describes how a wave would move differently through a pot of boiling water than the steam created from it? The wave would move faster through the water than through the steam. The wave would move slower through the water than through the steam. The wave would move the same speed through the water and the steam. The wave would move through the water and steam at the same speed, but decrease in speed at the transition point. "

Answer:

The wave would move faster through the water than through the steam.

Explanation:

As we already know, the water molecules at the moment when the water is boiling move very fast, due to the thermal energy that acts on them. This movement causes the mileculas to collide with each other quickly, for this reason we can observe that movement of the boiling water. This makes the wave movement in the boiling water fast.

On the other hand, all this movement is not seen in water vapor molecules, since the space between them is larger and there is no energy acting directly on them. For this reason, we can say that, through steam, the wave would not move with such speed.

Answer:

If we Drop any object there is gravity acts on it and the air resistance but since, we are given the condition in absence of air resistance

So, we will consider only the gravity and due to gravity all the three bowls bowling ball, a tennis ball, and a feather from the top of a tall building will hit the ground at same time.

Hence, The option D is correct.

Option A,B,C and E are discarded.

To summarize, the maximum angular acceleration of the pendulum's swing is 0.019 rad/s², and the maximum restoring force is 0.479 N, calculated using the principles of simple harmonic motion and confirmed with energy conservation principles.

To find the maximum angular acceleration, we can use the formula for angular acceleration: α = δθ/δt². In the context of a simple pendulum like this one, the angular acceleration at its maximum displacement is α = g/L * sin(θ), where g is the acceleration due to gravity (9.81 m/s²) and L is the length of the pendulum. Substituting the given values in, we find α = (9.81 m/s²/7.00 m) * sin(8.0°) = 0.019 rad/s² to three decimal places.

The maximum restoring force can be found using the formula F = ma, where m is the mass and a is the acceleration. In this case, the maximum restoring force, F = 0.350 kg * 9.81 m/s² * sin(8.0°) = 0.479 N to three decimal places.

To confirm these calculations, we could use an alternative model, such as energy conservation. In the energy model, the potential energy at the point of maximum displacement (the highest point of swing) is converted to kinetic energy at the lowest point. We also know that maximum restoring force coincides with maximum displacement in simple harmonic motion, while maximum speed (already calculated and given as 1.156 m/s) coincides with the position of equilibrium (the bottom of the swing).

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Part (a):-  [tex]\( v_{\text{max}} = 1.156 \)[/tex] m/s, which is correct. This part is complete.

Part (b):- [tex]\[ \alpha_{\text{max}} \approx 0.0280 \, \text{rad/s}^2 \][/tex]

Part (c):- [tex]\[ F_{\text{max}} \approx 0.4806 \, \text{N} \][/tex]

Part (d):- These models provide a comprehensive approach to analyze the motion of the simple pendulum, considering kinetic energy, potential energy, and forces involved.

Given data:

- Mass of the pendulum bob,  m = 0.350  kg

- Length of the pendulum,  L = 7.00  m

- Maximum angle of displacement,[tex]\( \theta = 8.0^\circ = 8.0 \times \frac{\pi}{180} \)[/tex] radians

You've already found this to be [tex]\( v_{\text{max}} = 1.156 \)[/tex] m/s, which is correct. This part is complete.

The maximum angular acceleration occurs at the maximum displacement, when the restoring force is at its maximum.

1. Calculate the gravitational acceleration:

 [tex]\[ g = 9.81 \, \text{m/s}^2 \][/tex]

2. Calculate the maximum restoring torque:

  The torque due to gravity at maximum displacement is:

  [tex]\[ \tau = mg \sin \theta \][/tex]

  where[tex]\( \theta \)[/tex] is the angle of displacement.

  [tex]\[ \tau = 0.350 \, \text{kg} \times 9.81 \, \text{m/s}^2 \times \sin(8.0^\circ) \][/tex]

  [tex]\[ \tau \approx 0.350 \times 9.81 \times 0.1392 \approx 0.4806 \, \text{Nm} \][/tex]

3. Calculate the moment of inertia of the pendulum bob:

[tex]\[ I = m L^2 \][/tex]

 [tex]\[ I = 0.350 \, \text{kg} \times (7.00 \, \text{m})^2 = 17.15 \, \text{kg} \cdot \text{m}^2 \][/tex]

4. Calculate the maximum angular acceleration [tex]\( \alpha_{\text{max}} \):[/tex]

  [tex]\[ \alpha_{\text{max}} = \frac{\tau}{I} \][/tex]

  [tex]\[ \alpha_{\text{max}} = \frac{0.4806}{17.15} \][/tex]

  [tex]\[ \alpha_{\text{max}} \approx 0.0280 \, \text{rad/s}^2 \][/tex]

The maximum restoring force occurs at maximum displacement:

1. Calculate the maximum restoring force [tex]\( F_{\text{max}} \):[/tex]

  [tex]\[ F_{\text{max}} = mg \sin \theta \][/tex]

 [tex]\[ F_{\text{max}} = 0.350 \, \text{kg} \times 9.81 \, \text{m/s}^2 \times \sin(8.0^\circ) \[/tex]]

 [tex]\[ F_{\text{max}} \approx 0.350 \times 9.81 \times 0.1392 \approx 0.4806 \, \text{N} \][/tex]

Let's summarize the solutions using other analysis models:

1. Energy Analysis Model (Kinetic and Potential Energies):

  - Maximum speed of the bob: [tex]\( v_{\text{max}} = 1.156 \) m/s[/tex]

  - Maximum potential energy: [tex]\( PE_{\text{max}} = mgh \)[/tex]

  - Maximum kinetic energy: [tex]\( KE_{\text{max}} = \frac{1}{2}mv_{\text{max}}^2 \)[/tex]

2. Force Analysis Model:

  - Maximum restoring force: [tex]\( F_{\text{max}} = mg \sin \theta \)[/tex]

  - Maximum angular acceleration: [tex]\( \alpha_{\text{max}} = \frac{\tau}{I} \),[/tex] where [tex]\( \tau = mg \sin \theta \) and \( I = mL^2 \)[/tex]

The gravitational force between the planets when they are 4.5 billion kilo-meters apart [tex]2.0*10^{21}[/tex] N.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Given in the question the planet Neptune has a mass of 1.02 x 10^26 kg, and earth's mass is 5.97 x 10^24 kg,

Newton's law of universal gravitation force is,

F = G m M/r²

F = [tex]6.67 * 10^{-11} * (1.02*10^{26})*(5.97×10^{24})/4500000000^{2}[/tex]

F = [tex]2.0*10^{21}[/tex]

The gravitational force between the planets when they are 4.5 billion kilo-meters apart [tex]2.0*10^{21}[/tex] N.

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According to Ohm's law, the voltage that produces a 6A current in a circuit that has a total resistance of 3Ω is 18 Volts.

Ohm's law states that the current passing through a conductor is directly proportional to its voltage. this can be expressed as,

[tex]I=\frac{V}{R}[/tex]

Where R is the ohm's constant called resistance measured in ohms.

From the law mentioned above, we can write Voltage as,

[tex]V=IR[/tex]

The circuit has 3Ω of resistance and the current flowing through it is 6A. Then the voltage of the circuit is,

[tex]\[\begin{align} & V=6\times 3 \\ & =18 \\ \end{align}\][/tex]V=6×3

 =18 volts

Thus, the required voltage for a circuit that has 3Ω of resistance and produces 6A of current to flow through it is 18 Volts.

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Answer:

[tex]m = 2.72 \times 10^{-3} g[/tex]

Explanation:

total number of protons in 5 gram of total mass is given as

[tex]N = \frac{m}{m_p}[/tex]

here we have

[tex]N = \frac{5}{1.67262 \times 10^{-24}}[/tex]

[tex]N = 2.99 \times 10^{24}[/tex]

now to neutralize the charge we require same amount of negatively charge electrons

so we have

[tex]m = N(m_e)[/tex]

[tex]m = (2.99 \times 10^{24})(9.1 \times 10^{-28})[/tex]

[tex]m = 2.72 \times 10^{-3} g[/tex]

Answer:

1391

Explanation:

the answer is visible light

Sodium chloride (table salt) is safe to eat in moderate amounts because its chloride ions are chemically bound, unlike toxic chlorine gas.

Sodium chloride, commonly known as table salt, is composed of sodium (Na+) and chloride (Cl-) ions. While chlorine gas (Cl2) can be toxic when inhaled or ingested in large amounts, chloride ions in sodium chloride are chemically bound to sodium ions, forming a stable compound.

When consumed in appropriate quantities, sodium chloride dissociates into its respective ions in the digestive system. Sodium ions play crucial roles in nerve transmission and muscle function, while chloride ions help maintain the body's acid-base balance and regulate fluid levels.

The human body has evolved mechanisms to regulate the intake and excretion of sodium and chloride ions, ensuring proper physiological function. Ingesting moderate amounts of sodium chloride as part of a balanced diet poses no significant health risks and is necessary for maintaining normal bodily functions.

However, excessive consumption of sodium chloride can lead to health issues such as high blood pressure and cardiovascular diseases, emphasizing the importance of moderation in dietary intake.

Answer:

the weight of the bookcase is 363N

The iron filings sprinkled on a piece of paper demonstrate is "the pattern of the magnetic fields lines".

A magnetic field would be a vector field which thus explains the magnetic influence affecting electric charges, electric currents, as well as magnetic materials.

The chemical element iron has the atomic number 26 and also the symbol Fe. It is just a metal that would be found in group 8 of such periodic table and the very first transition series.

Therefore, the iron filings sprinkled on a piece of paper demonstrate is "the pattern of the magnetic fields lines".

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The initial mass of the Bismuth-212 sample is 10.56 grams.

To find the initial mass of the Bismuth-212 sample, we can use the concept of half-life. The half-life of Bismuth-212 is given as 60.5 seconds. Since the sample has a mass of 2.64 grams after 121 seconds, we can calculate the number of half-lives that have passed.

The number of half-lives is given by the formula:     Number of Half-lives = Total Time / Half-life

So, the number of half-lives = 121 s / 60.5 s = 2 half-lives.

Since each half-life results in half the initial mass remaining, after 2 half-lives, the remaining mass would be (1/2)(1/2) = 1/4 of the initial mass.

If we let the initial mass be x grams, then after 2 half-lives, the remaining mass is (1/4)x grams.

Given that the remaining mass is 2.64 grams, we can solve for the initial mass:

(1/4)x = 2.64 grams

Simplifying, x = 2.64 grams * 4 = 10.56 grams.

Therefore, the initial mass of the sample of Bismuth-212 is 10.56 grams.

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Power can be defined as the rate at which the work has been accomplished in a system. Thus, the correct option is D.

The power is the quantity which has only magnitude, that is a scalar quantity. The SI unit of power is watt, and it is also written as J/s or Joules per second.

Power can be defined as the rate at which the work is finished or the energy is transferred from one location to another or energy transformed from one form into another form.

The term energy is the capacity of a body to do work or result in some displacement by the application of some force.

Therefore, the correct option is D.

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The atomic mass of caesium with atomic number of 55 and neutron of of 78 is 133 amu.

The atomic mass of an element is the sum of the proton number and the neutron number.

The proton and neutron contributes mostly to the weight of an atom. The proton and neutron are located in the nucleus an atom.

The atomic number of an element is the same as the proton number of an element. Therefore, since the atomic number of caesium is 55, the proton number is also 55.

The atomic mass of caesium can be computed as follows:

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Electrical energy is transformed into other forms of energy such as mechanical or thermal when passing through household devices like blenders or toasters.

When electrical energy passes through a household device such as a blender or a toaster, it is transformed into another form of energy. This process is known as energy transformation. For instance, in a blender, the electrical energy is converted into mechanical energy to spin the blades, and in a toaster, it is transformed into thermal energy to heat the bread. This transformation of energy allows the appliances to perform their respective functions.

The power rating of the lightbulb is mathematically given as

P=  60 watts

Question Parameters:

An incandescent lightbulb operating at 120 volts draws a current of 0.50 ampere for 240 seconds.

Generally, the equation for the Power  is mathematically given as

P=VI

Therefore

P= (20 x 0.5

P=  60 watts

In conclusion, the power rating of the lightbulb

P=  60 watts

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The average force acting on the blood as it is pumped into the aorta is [tex]\boxed{0.4\text{ N}}[/tex].

Explanation:

As the blood enters the aorta, the speed of the blood increases from zero to [tex]1\text{ m/s}[/tex] in a time of [tex]0.2\text{ s}[/tex]. It means that the blood moves under the acceleration as it passes through the aorta.

The acceleration produced in a body is due to the force experienced by the particular amount of blood as it enters the aorta.

Write the expression for the acceleration of the blood as its speed increases.

[tex]\boxed{a=\dfrac{v_{f}-v_{i}}{t}}[/tex]                                      ...... (1)

Here, [tex]v_{f}[/tex] is the final velocity of blood, [tex]v_{i}[/tex] is the initial velocity and [tex]t[/tex] is the time taken to accelerate.

Substitute the values of the velocities and the time taken by the blood in equation (1).

[tex]a&=\dfrac{1-0}{0.2}\text{ m}\text{/s}^2}\\&=\dfrac{1}{0.2}\text{ m}\text{/s}^2}\\&=5\text{ m}\text{/s}^2}[/tex]

The net force acting on the blood is given by:

[tex]F=m\times{a}[/tex]                                         ...... (2)

Substitute the values of mass and acceleration in the above expression.

[tex]\begin{aligned}F&=80\text{ g}\left(\dfrac{1 \text{ kg}}{1000\text{ g}}\right)\times\left(5\text{ m/s}^2\right)\\&=0.08\times5\text{ N}\\&=0.4\text{ N}\end{aligned}[/tex]

Therefore, the average force acting on the blood as it is pumped into the aorta is [tex]\boxed{0.4\text{ N}}[/tex].

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Answer Details:

Grade: High School

Subject: Physics

Chapter: Force and acceleration

Keywords:

heartbeat, average force, aorta, blood, rest, speed up, acceleration, initial speed, final speed, time, accelerated, 80 g, blood is pumped.

Final answer:

The average force on the blood during this time is 0.4 Newtons.

Explanation:

The average force on the blood can be calculated using the equation:

F = m * a

where F is the force, m is the mass, and a is the acceleration.

In this case, the mass of the blood is given as 80 g (or 0.08 kg) and the acceleration is the change in velocity divided by the time taken.

Given that the blood is accelerated from rest to 1 m/s in 0.2 s, the acceleration is calculated as:

a = (v-u)/t

Substituting the given values:

a = (1-0)/0.2 = 5 m/s²

Plugging the values back in the original equation:

F = 0.08 kg * 5 m/s² = 0.4 N

So, the average force on the blood during this time is 0.4 Newtons.