determination of the size of molecule using oil drop experiment​

A low-voltage thermostat in an electric furnace is used to control the temperature.

The low-voltage thermostat plays a crucial role in regulating the temperature within an electric furnace. When connected to the furnace's heating system, the thermostat acts as a control device, allowing users to set their desired temperature.

Here's how it works:

Sensing the temperature: The low-voltage thermostat contains a sensor that measures the ambient temperature of the room or space where the furnace is located. This sensor detects any fluctuations in temperature, whether it's too hot or too cold.

Signaling the furnace: Once the desired temperature is set by the user, the thermostat compares it to the current room temperature. If the current temperature deviates from the set temperature, the thermostat sends a signal to the furnace.

Adjusting the heating: Upon receiving the signal, the furnace responds accordingly. If the room temperature is lower than the desired temperature, the furnace activates its heating elements, generating warmth. Conversely, if the room temperature exceeds the desired temperature, the furnace shuts off or reduces its heating output.

In summary, the low-voltage thermostat in an electric furnace acts as a mediator between the user and the heating system. It senses the temperature, signals the furnace when necessary, and adjusts the heating output to maintain a comfortable and consistent temperature in the space. By doing so, it helps ensure energy efficiency and provides a comfortable environment for occupants.

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The surface tension of the liquid is 24.1 g/m.

To determine the surface tension of the liquid, employ the formula:

surface tension = (extra force required) / (length of the film)

extra force required = 3.03 g

internal radius = 3 cm = 0.03 m

external radius = 3.2 cm = 0.032 m

The length of the film can be calculated as the circumference of the external ring minus the circumference of the internal ring:

length of the film = (2 * pi * external radius) - (2 * pi * internal radius)

= (2 * pi * 0.032 m) - (2 * pi * 0.03 m)

= 0.1257 m

Hence, the surface tension can be determined following our chosing formula:

surface tension = (3.03 g) / (0.1257 m)

= 24.1 g/m

It can then be concluded that the surface tension of the liquid is 24.1 g/m.

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Answer:

800 meters

Explanation:

4 x 200 is 800 meters.

The radius of the event horizon for a black hole is measured by the Schwarzschild Radius.

Hence, the correct option is B.

The Schwarzschild Radius is a characteristic length scale associated with a non-rotating, spherically symmetric black hole.

It represents the radius of the event horizon, which is the boundary beyond which nothing, including light, can escape the gravitational pull of the black hole.

It is denoted by the symbol "rs" and is calculated based on the mass of the black hole. The Schwarzschild Radius determines the size of the event horizon and plays a crucial role in defining the properties of a black hole.

Therefore, The radius of the event horizon for a black hole is measured by the Schwarzschild Radius

Hence, the correct option is B.

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Answer:

D. Tidal energy is replaced naturally by the Moon's gravity.

Explanation:

The reason tidal energy is considered a renewable energy resource is that Tidal energy is replaced naturally by the Moon's gravity. The Moon's gravity creates bulges on the side of Earth that is closest and farthest from the Moon. These bulges also pull water causing high tides in those areas. As the Earth rotates these areas experience low tide while the areas that had low tide now experience high tide. This constant shift creates tidal energy every day, which is replenished naturally.

Answer:

the reaction force is to the left and of the same magnitude

Explanation:

To analyze this collision we see that when the bowling ball collides with the pin it exerts a force on it and by the law of action and reaction the pin exerts a force of equal magnitude and opposite direction on the ball.

Due to the high difference in mass, the speed and direction of the bowling ball is little altered, instead the speed and direction of the pin change significantly.

In summary the reaction force is to the left and of the same magnitude

Answer:

I think B) is uncorrect

Explanation:

As A) p=w/t so it's correct relation

C) power depend on time and work as work is distance multiple force so it refer to velocity

D) the powerful mean much work in a few time

Answer:

v= 50 m/s

λ(wavelength)= 12.5 m

Explanation:

1.

The formula that relates these three quantities is:

v = f * λ

This means that the wave velocity is equal to the product of the frequency and the wavelength. The wavelength is the distance between two consecutive crests or troughs of a wave. The frequency is the number of waves that pass a fixed point in one second.

If we are given the initial wave velocity and frequency, we can find the initial wavelength by rearranging the formula:

λ = v / f

Plugging in the given values, we get:

λ = 50 / 2 λ = 25 m

This means that the initial wavelength of the wave on the slinky is 25 m.

If we shake the slinky at different frequencies, we can measure the wave velocity and plot it against the frequency. To find the wave velocity for each frequency, we can use the same formula:

v = f * λ

However, since the wavelength will change as we change the frequency, we need to measure it for each frequency as well. For example, if we shake the slinky at 4 Hz, and measure the wavelength as 12.5 m, then the wave velocity is:

v = 4 * 12.5 v = 50 m/s

We can repeat this process for different frequencies and wavelengths, and plot the points on a graph. The graph should show a linear relationship between v and f, with a slope equal to λ. The graph should look something like this:

graph of v vs f

The graph shows that as the frequency increases, so does the wave velocity, and vice versa. The wavelength is constant for each point, and it is equal to the slope of the line. For example: at f = 2 Hz, v = 50 m/s, and λ = 25 m. At f = 4 Hz, v = 50 m/s, and λ = 12.5 m. At f = 6 Hz, v = 75 m/s, and λ = 12.5 m.

(graph in the attachment)

2.

The formula that relates these three quantities is:

v = f * λ

This means that the wave velocity is equal to the product of the frequency and the wavelength. The wave velocity is the speed at which the wave travels along the slinky. The wavelength is the distance between two consecutive crests or troughs of a wave. The frequency is the number of waves that pass a fixed point in one second.

If we are given the initial wave velocity and we shake the slinky at different frequencies, we can measure the wavelength and plot it against the frequency. To find the wavelength for each frequency, we can rearrange the formula:

λ = v / f

Plugging in the given value of v and different values of f, we can find λ. For example, if we shake the slinky at 2 Hz, then the wavelength is:

λ = 50 / 2 λ = 25 m

If we shake the slinky at 4 Hz, then the wavelength is:

λ = 50 / 4 λ = 12.5 m

We can repeat this process for different frequencies and wavelengths, and plot the points on a graph. The graph should show an inverse relationship between λ and f, with a constant value of v. The graph should look something like this:

graph of λ vs f

The graph shows that as the frequency increases, the wavelength decreases, and vice versa. The wave velocity is constant for each point, and it is equal to the product of λ and f. For example, at f = 2 Hz, λ = 25 m, and v = 50 m/s. At f = 4 Hz, λ = 12.5 m, and v = 50 m/s. At f = 6 Hz, λ = 8.33 m, and v = 50 m/s.

(graph in the attachment)

Answer:

seismic

Explanation:

I'm not 100 percent sure but I hope this helps

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Answer:

a = 4 m/s²

Explanation:  

Given: 28 N, 7 kg  

To find: Acceleration (a)  

Solution: To find (a), divide force by weight  

A = F ÷ m

=  28 ÷  7

= 4 m/s²

Newtons are derived units, equal to 1 kg-m/s². In other words, a single Newton is equal to the force needed to accelerate one kilogram one meter per second squared.

We can utilize Einstein's mass-energy equivalence equation, E = mc², where E represents the energy. The work done on the particle is equal to the change in energy.

When the particle is at rest, its energy is solely its rest energy, which is given by E = mc². As the particle is accelerated to a speed of 0.902 c, its total energy increases. The change in energy (ΔE) is the difference between the final energy and the initial rest energy.

The final energy of the particle when it reaches a speed of 0.902 c is given by E = γmc², where γ is the Lorentz factor. The Lorentz factor is defined as γ = 1/√(1 - (v/c)²), where v is the velocity of the particle.

By substituting the given values into the Lorentz factor equation, we can calculate the Lorentz factor for the particle. With the Lorentz factor known, we can determine the final energy of the particle.

The work done on the particle is equal to the change in energy, so the work can be calculated as ΔE = (γ - 1)mc². By substituting the values into the equation and expressing the answer as a multiple of mc², we can determine the work required to accelerate the particle to the given speed.

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The system described by the transfer function G(s) = -co² s² + 2a + w², with a damping ratio of 1.3 and a natural frequency of 0.5, has an overdamped unit step response. So, the correct option is (E)

The transfer function of the system is given as G(s) = -co² s² + 2a + w², where co represents the damping ratio, a represents an arbitrary constant, and w represents the natural frequency of the system. We are given that the natural frequency is 0.5 and the damping ratio is 1.3.

To determine the type of unit step response, we need to analyze the damping ratio (co) in relation to the critical damping value (co_critical).

The critical damping ratio (co_critical) is defined as the value where the system is on the threshold between being overdamped and underdamped. It is given by the formula co_critical = 2 * sqrt(a * w²).

In our case, the natural frequency (w) is 0.5, so we can calculate co_critical as follows: co_critical = 2 * sqrt(a * 0.5²).

Since the damping ratio (co) is given as 1.3, we can compare it with co_critical to determine the type of unit step response.

If co > co_critical, the system is considered overdamped (Option E).

If co = co_critical, the system is considered critically damped (Option D).

If co < co_critical, the system is considered underdamped (Option C).

Based on the given values, we can determine that the system is overdamped (Option E) because the damping ratio (1.3) is greater than the critical damping ratio.

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Therefore, a pendulum swinging back and forth does not exhibit uniform circular motion but rather periodic oscillatory motion.

No, a pendulum swinging back and forth is not an example of uniform circular motion.

Uniform circular motion refers to an object moving in a circular path at a constant speed. In uniform circular motion, the object's velocity is always tangent to the circle, and its magnitude remains constant throughout the motion.

On the other hand, a pendulum swinging back and forth involves the motion of a mass (bob) attached to a string or rod, which is usually constrained to move in a linear path. The motion of the pendulum is governed by the force of gravity and follows a periodic oscillation.

Although the path of the pendulum's bob may resemble a portion of a circle, it is not a circular motion because the speed and direction of the bob change continuously as it swings. At the extreme points of its swing, the velocity of the bob is momentarily zero, and as it passes through the lowest point, the velocity is at its maximum.

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Linear speed of the tip of the minute hand of regular clock whose hand is 7.2 cm in length is : 1.25 x 10⁻⁴ m/s.

Minute hand of any regular clock completes one full revolution in 60 minutes ( 3600 seconds) and linear speed of the tip of minute hand can be calculated as follows:

Distance traveled by the tip of minute hand = Circumference of the circular path traced by tip of the minute hand

= 2πr, where r is length of the minute hand

Therefore, distance traveled by the tip of the minute hand = 2π(7.2 cm) = 45.12 cm

Time taken to travel this distance = Time taken for one revolution = 3600 seconds

Therefore, the linear speed of the tip of the minute hand = Distance traveled ÷ Time taken

= 45.12 cm ÷ 3600 seconds

= 0.01253333 cm/s

= 1.25 x 10⁻⁴ m/s.

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Answer:

86.4 m  horizontal from landing spot

Explanation:

Find out how long before the ball hits the ground

 vertical speed  of ball = -2  m/s     gravity = - 9.81 m/s^2

find time to hit ground from 100 m  

          ( height will be zero when it hits the ground)

0 =  100  - 2 t  - 1/2 ( 9.81) t^2

        use Quadratic Formula to find t = 4.32 seconds

              horizontal speed of ball = 20 m/s  

in 4.32 seconds it will travel horizontally   20  m/s * 4.32 s = 86.4 m

Charge on each plate of 3.00µF capacitor is 48C when it is connected to a 16.0-V battery.

The capacitors capacity to store this electrical charge ( Q ) between its plates is corresponding to the applied voltage, V for a capacitor of known capacitance in Farads. Note that capacitance C is Dependably sure and never negative.The more prominent the applied voltage the more noteworthy will be the charge put away on the plates of the capacitor.

Moreover, the more modest the applied voltage the more modest the charge. Hence, the genuine charge Q on the plates of the capacitor and can be determined as:Capacitance is the deliberate worth of the capacity of a capacitor to store an electric charge. This capacitance esteem likewise relies upon the dielectric consistent of the dielectric material used to isolate the two equal plates. Capacitance is estimated in units of the Farad (F), so named after Michael Faraday.

So,we know that charge on capacitor is equal to=capacitance×Voltage

=>Q=C×V

We have C=3.00-µF ,V=16V

=>Q=3×16

=>Q=48Columb.

Hence,charge on each plate is 48C.

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If the total momentum of the insects is zero, this means all of the insects are at rest or are moving in opposite of each other. Same if the total kinetic energy is zero.

Momentum is the quantity of motion which is multiplied by the amount of matter moved i.e., mass and the velocity at which it moves. Because, the object is in motion, it is a vector quantity, it has both direction and magnitude. It is determined by the product of the object's mass and the velocity of object.

If the total momentum of the insects is zero, this could mean anything of the two things. Either, all of the insects are at rest or an equal amount of insects are moving in opposite direction of each other which cancels out the total momentum of the insects.

If the total kinetic energy of the insects is zero, this means either all of the insects are at rest or an equal amount of insects are moving in opposite direction of one another which results into canceling out the energy.

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Studies of sunquakes, or helioseismology, have revealed that our mathematical models of the solar interior are fairly accurate. The correct option is (B).

Helioseismology is the study of the Sun's internal structure and dynamics by analyzing its oscillations.

These oscillations, often referred to as sunquakes, are caused by sound waves trapped and bouncing within the Sun. By studying the properties and behavior of these waves, scientists can gain valuable insights into the solar interior.

Through helioseismology, scientists have found that our mathematical models of the Sun's interior, based on principles of physics and stellar evolution, align quite well with the observed data.

The oscillation patterns and frequencies detected from the Sun match the theoretical predictions, providing confidence in our understanding of the Sun's internal structure, composition, and energy generation mechanisms.

A) the Sun vibrates only on the surface.

Helioseismology studies have revealed that the Sun vibrates not only on its surface but throughout its interior as well. Therefore, option A is incorrect.

Overall, helioseismology has contributed significantly to our knowledge of the Sun's dynamics and has validated our mathematical models, making option B the correct answer.

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Answer:

have no any type of charge

Answer:

Atoms do not always contain the same number of electrons and protons, although this state is common. When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral. In contrast, when an atom loses or gains an electron (or the rarer case of losing or gaining a proton, which requires a nuclear reaction), the total charges add up to something other than zero. The atom is then said to be electrically charged, or "ionized". There is a major difference between the neutral state and the ionized state. In the neutral state, an atom has little electromagnetic attraction to other atoms. Note that the electric field of a neutral atom is weak, but is not exactly zero because the atom is not a point particle. If another atom gets close enough to the atom, they may begin to share electrons. Chemically, we say that the atoms have formed bonds.

False. Between the convective zone as well as the core of the Sun is indeed the radiative zone, which has temperatures somewhere around 2 million and 7 million degrees Celsius.

The radiative zone is a layer of a star located between the core and the convective zone. It is where energy produced in the core is transported to the outer layers of the star by radiation. This energy is generated by nuclear fusion in the core and then transported to the photosphere in the form of electromagnetic radiation. As the energy travels through the radiative zone, it is absorbed and re-emitted at multiple frequencies, resulting in a decrease in temperature. The radiative zone is much thicker than the convective zone, with temperatures ranging from around 1 million to 7 million Kelvin. The radiative zone is the main source of a star’s luminosity, and is critical to its overall stability.

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The results of young's double-slit experiment were

- Waves produced a diffraction pattern.

- Results supported the wave theory of light.

- Results supported the particle theory of light

Two coherent sources of light are employed in Young's double-slit experiment, which is often conducted at a distance that is only a few times greater than the wavelength of the light used. Young's double-slit experiment contributed to our knowledge of the diagrammed wave theory of light.

The act of bending of the light around edges such that it expands out and illuminates regions, where a shadow is anticipated, is known as the diffraction of light. In general, since both occur simultaneously, it is challenging to distinguish between diffraction and interference.

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Answer: A,B,E.

Explanation: doing the quiz on edge!

The standing wave in the figure has 4 nodes and 3 antinodes.

The wavelength of a standing wave is given by,

Where n=number of nodes-1

From the figure n=3

Therefore the wavelength is,

Therefore the wavelength of the stationary wave produced in the given string of length L is (2/3)L.

Adding passengers to an old car with worn-out shock absorbers will increase the mass of the car, causing the frequency of oscillation to decrease.

This is because the frequency of oscillation depends on the mass and the force constant of the spring, according to the equation T=2π√(m/k), where T is the period, m is the mass, and k is the force constant. Adding mass increases the period and therefore decreases the frequency, so (a) the car's frequency of oscillation is less than what it was before.

The best explanation is I. Increasing the mass on a spring increases its period, and hence decreases its frequency. This is because the force required to move a heavier mass is greater, which increases the period and decreases the frequency. While the force constant of the spring does affect the frequency, it is dependent on the mass, so III is incorrect. II is also incorrect as it suggests the frequency is independent of mass, which is not true.

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Given:

The mass on the table is,

The hanging mass is,

THe coefficient of friction is,

let the acceleration of the whole system is a (for the hanging mass it is downward and for the mass on the table it is rightward). the tension towards The fixed point of the pulley is T.

we can write,

Adding these equations we get,

Substituting the values we get,

Hence the acceleration is 6.66 m/s^2.