In the photoelectric effect experiment, what does the threshold frequency determine?.

Yeah. Plants have hormones. There are five major types of plant hormones: auxins, cytokinins, gibberellins, ethylene, and abscisic acid.

-_-

The total energy of the body at evevry point is remained same due to the law of conservation of energy. Distance from A to B and final velocity of the ball just reach before C is 44.3 m/s.

d (distance) from A to B is = √2gh

In this case given are, g = 9.8 m/s² and h = 100m,

so here d = √(2⋅9.8⋅100) = 44.3m.

Final velocity ,v = √2gh

Here given are , v is the velocity, g is the acceleration due to gravity, and h is the height. In this case,

g = 9.8 m/s² ,h = 100m,

v = √(2⋅9.8⋅100)

= 44.3 m/s (final velocity)

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The radioactive half-life is given by:

Where:

Answer:

The acceleration time graph is the graph that is used to determine the change in velocity in the given interval of the time. ... The acceleration time graph is used to find the change in the velocity of the moving object for the given period of time and this can be determined by finding the area under the curve

Explanation:

We are given a horizontal string tied to a support at one end while the other end passes over a frictionless pulley and is tied to a 1.5 kg sphere.

The frequency of the fifth harmonic with the sphere submerged exactly matches the frequency of the third harmonic before the sphere was submerged. We have to find the diameter of the sphere.The wave speed v is given as:v = fλ  ----- (1)where f is the frequency of standing waves and λ is the wavelength of the standing wave.

On changing the medium, the wave speed v changes. However, the frequency f of the standing wave remains the same, while the wavelength λ changes.When the sphere was suspended in the air:In this case, the frequency f is such that for the third harmonic λ3 fits in the length L of the string twice, i.e.,λ3 = 2L/3  ---------------- (2)Also, the frequency f is such that for the fifth harmonic λ5 fits in the length L of the string four times, i.e.,λ5 = 4L/5  ---------------- (3)Equating (1) for both the cases we get:f λ3 = v  ---------------- (4)and f λ5 = v  ---------------- (5)As the frequency f is common to both cases, we can equate (4) and (5) to get:λ3 / λ5 = 4 / 5  ---------------- (6)Substituting (2) and (3) in (6) we get:2L/3 / 4L/5 = 4 / 5Or, L = 5/2×2×3 = 5/12 mNow, when the sphere is completely submerged in the water:In this case, the frequency f is such that for the fifth harmonic λ'5 fits in the length L' of the string four times, i.e.,λ'5 = 4L'/5  ---------------- (7)Equating (1) for both the cases we get:f λ3 = v  ---------------- (8)and f λ'5 = v'  ---------------- (9)As the frequency f is common to both cases, we can equate (8) and (9) to get:λ3 / λ'5 = v / v'  ---------------- (10)We know that the wave speed in water is less than the wave speed in air. Therefore, v' < v. From (10) we can conclude that:λ3 > λ'5  ---------------- (11)Substituting (2) and (7) in (11) we get:2L/3 > 4L'/5Or, L' < 5/6LNow, let d be the diameter of the sphere. In water, the sphere would displace its own volume of water. Let V be the volume of the sphere. Then, the volume of water displaced by the sphere is also V. Let ρ be the density of water. Then, the mass of water displaced by the sphere is m = ρV.The mass of the sphere in air is 1.5 kg. When the sphere is submerged in the water, it would experience a buoyant force equal to the weight of the water displaced by it. Therefore, the effective weight of the sphere in water is:(1.5 - ρV) g kgWhere g is the acceleration due to gravity.Substituting L' < 5/6L in (5) we get:λ'5 = 4L'/5 = 4/5 × 5/6L = 2/3LNow, substituting v' = λ'5 f in (9) we get:v' = λ'5 f = 2/3L × f  ---------------- (12)Also, the effective weight of the sphere in water is given as:(1.5 - ρV) g kg.Substituting in (4) for the case when the sphere was suspended in air and in (12) for the case when the sphere was completely submerged in the water, and equating the two, we get:(1.5 - ρV) g × λ3 / v = (1.5 - ρV) g × λ'5 / v'Or, λ3 / λ'5 = v / v'  ---------------- (13)From (11) and (13) we get:v / v' > 1  ---------------- (14)Substituting the values we get,5/12 / 2/3L = 4/5L' / 2/3L'Or, 5/12 = 4/5 × 2/3L'/L = 8/15L'/LTherefore, L' = 5/6LNow, the volume V of the sphere is given by:V = (4/3) π (d/2)³Substituting this value of V in (3) we get:1.5 - ρ(4/3) π (d/2)³ g = 0.5ρL²gOr, (4/3) π (d/2)³ = (1.5/ρg) - (0.5/ρg)L²Now, substituting L = 5/12 m and L' = 5/6L = 5/6 × 5/12 m = 5/72 m in the above equation we get:(4/3) π (d/2)³ = 0.05 - 1.5625×10⁻⁴Or, (d/2)³ = 1.7976×10⁻⁵Or, d = 2(1.7976×10⁻⁵)¹/³ = 0.1 m = 10 cmTherefore, the diameter of the sphere is 10 cm.

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Answer:

speakers is going to be your answer

Answer:

doorbells

Explanation:

Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

Answer:the answer is c

Explanation: In contrast, light waves CAN travel through a vacuum, and do not require a medium. In empty space, the wave does not dissipate grow smaller no matter how far it travels, because the wave is not interacting with anything else. However, light can also travel within some materials, like glass and water.

Explanation:

150 km North, 50 km West,

The magnitude of the charge on each sphere is 1.51 x 10^-7 C.

The magnitude of the charge on each sphere can be calculated using Coulomb's law:

F = k * q1 * q2 / r^2

where F is the force of repulsion, k is Coulomb's constant (8.99 x 10^9 Nm^2/C^2), q1 and q2 are the magnitudes of the charges on the spheres, and r is the separation distance between the spheres.

Rearranging the equation to solve for the charge:

q = sqrt(F * r^2 / k)

Substituting the given values:

q = sqrt(22 * 10^-3 N * 16 * 10^-3 m^2 / 8.99 * 10^9 Nm^2/C^2) = 1.51 x 10^-7 C.

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Answer:

The new kinetic energy is 9 times of the initial kinetic energy.

Explanation:

The kinetic energy of an object is given by the formula as follows :

\(E=\dfrac{1}{2}mv^2\)

Where

m is mass and v is speed of the body

If the speed of the body is tripled. Let v' is the new speed, v' = 3v. The new kinetic energy is E' and it is given by :

\(E'=\dfrac{1}{2}mv'^2\\\\\text{Put v' = 3v}\\\\E'=\dfrac{1}{2}m\times (3v)^2\\\\=\dfrac{1}{2}m\times 9v^2\\\\=9\times (\dfrac{1}{2}mv^2)\\\\E'=9\times E\)

Hence, the new kinetic energy is 9 times of the initial kinetic energy.

The modulus of elasticity, E, is a measure of a material's stiffness and ability to resist deformation when a force is applied. It is defined as the ratio of stress to strain within the elastic range of the material. In other words, it describes how much a material will stretch or compress under a given force.

The modulus of elasticity is important because it allows engineers to predict how materials will behave under different conditions, such as temperature changes, loading conditions, and other factors. It also helps to determine the maximum load a material can withstand before it starts to deform or break.

In detail, the modulus of elasticity is a fundamental property of a material that describes its ability to resist deformation when subjected to external forces. It is calculated by measuring the stress and strain of the material and using the equation E = σ/ε, where σ is stress and ε is strain.

The modulus of elasticity is important in many areas of engineering, such as structural design, materials science, and mechanics. It helps to ensure that structures and materials are designed and tested to withstand the loads and stresses they will be subjected to, and it provides a basis for comparing different materials and choosing the best one for a particular application.

In summary, the modulus of elasticity, E, is a material property that describes its stiffness and resistance to deformation. It is correctly determined using Hooke's Law and is crucial for predicting the mechanical behavior of materials when subjected to stress.

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Answer:

To calculate the linear expansion of a brass rod due to a temperature change of 100K, we can use the formula:

ΔL = α * L * ΔT

where:

α = linear expansivity of brass (1.8 x 10^-5K^-1)

L = original length of the rod (2m)

ΔT = change in temperature (100K)

Plugging in the values:

ΔL = 1.8 x 10^-5K^-1 * 2m * 100K = 0.036m

So the linear expansion of the brass rod due to a temperature change of 100K is 0.036 meters.

Answer:

I believe it would be B.

Explanation:

When a object is in a gas or liquid form then take whatever the form of the container they are in is. Meaning they can change their volume depending on the container. Also a characteristic of gas and liquid is to take the shape of the container. This may be wrong but this is what I would choose

Answer: A is actually the correct answer. The guy who said B is wrong

Explanation: Gas and plasma both have Changing shape and changing volume

The subsequent current in the series RLC circuit is given by the equation: i(t) = I * cos(5t - Φ), where I is the amplitude of the current and Φ is the phase angle.

To find the subsequent current, we need to calculate the amplitude (I) and the phase angle (Φ) of the current.

First, let's calculate the resonant frequency (ω) of the circuit:

ω = 1 / √(LC) = 1 / √(10 * 10^(-2)) = 1 / √1 = 1 rad/s.

The applied voltage can be written as E(t) = E * cos(ωt), where E is the amplitude of the voltage.

Comparing this with the given voltage E(t) = 200 * cos(5t), we can equate the angular frequencies: ω = 5.

Now, let's find the impedance (Z) of the circuit:

Z = √(R^2 + (Xl - Xc)^2),

where R is the resistance, Xl is the inductive reactance, and Xc is the capacitive reactance.

R = 20 Ω

Xl = ωL = 1 * 10 = 10 Ω

Xc = 1 / (ωC) = 1 / (5 * 10^(-2)) = 20 Ω

Plugging in these values, we get:

Z = √(20^2 + (10 - 20)^2) = √(400 + 100) = √500 ≈ 22.36 Ω.

The amplitude of the current (I) can be calculated using Ohm's Law:

I = E / Z = 200 / 22.36 ≈ 8.94 A.

The phase angle (Φ) can be found using the relationship between resistance, inductive reactance, and capacitive reactance:

tan(Φ) = (Xl - Xc) / R = (10 - 20) / 20 = -0.5.

Therefore, Φ ≈ -0.464 rad.

The subsequent current in the series RLC circuit is given by i(t) = 8.94 * cos(5t + 0.464) A.

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Answer:

The speed of Alessandra's motion is 2 ft/s up.

(C) is correct option.

Explanation:

Given that,

Time = 1 sec

Height = 2 feet

We need to calculate the speed of Alessandra's motion

Using formula of speed

\(v=\dfrac{d}{t}\)

Where, v = speed

d = height

t = time

Put the value into the formula

\(v=\dfrac{2}{1}\)

\(v=2\ ft/s\)

The direction will be up ward.

Hence, The speed of Alessandra's motion is 2 ft/s up.

(C) is correct option.

Answer:

A. 2 ft/s

Explanation:

The relationship between loudness and frequency can be shown graphically using equal loudness curves. Equal loudness curves, also known as Fletcher-Munson curves, illustrate the human ear's sensitivity to different frequencies at varying loudness levels.

The curves plot the sound pressure level (SPL) in decibels (dB) against frequency in Hertz (Hz) for a sound that is perceived to be equally loud at different frequencies. The curves indicate that the human ear is most sensitive to frequencies around 3,500 Hz and less sensitive to low and high frequencies. Additionally, the curves show that at a low sound level, the ear's sensitivity is greatest for mid-range frequencies, whereas, at high sound levels, the sensitivity is greatest for low and high frequencies. These curves are essential in sound engineering, where the proper balance between frequencies is crucial to achieving an optimal sound experience. Understanding the relationship between loudness and frequency can help sound engineers produce high-quality sounds that are pleasant to the listener's ear.

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Answer:

11m/s^2

Explanation:

Acceleration can be calculated by diving speed by time. Since we know speed and time, acceleration can be calculated.

55/5 = 11m/s^2

The force needed to break another wire of the same length and material but twice the diameter is 200N.

Because the wires are made of the same material, their modulus of elasticity must be the same.

As a result, the ratio of longitudinal stress to longitudinal strain (Young's Modulus of Elasticity) must be the same. Now, the strains in both wires must be the same before they break.

Therefore,

stress = Young's modulus × strain,

both wires must be the same.

Because the second wire has a diameter twice that of the first, its area of cross section is four times that of the first. As a result, in order to generate the same stress, the force applied to the second wire must be four times that applied to the first wire.(since stress = force/cross section area).

Thus, the force required to break the second wire is 4200=800N.

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Answer:

I dont really know but i think its water type of energy

Explanation:

Hope it helps

In order to create a magnifier in convex lens, you should choose a short focal length that is lesser than 1 meter.

A convex lens is also referred to as converging lens and it can be defined as a type of lens that typically causes parallel rays of light with respect to its principal axis to come to a focus (converge) and form a real image.

In Science, a magnifier refer to an optical instrument that allow us to look at a very near object because its image is generally formed farther away. Thus, the image of the object appears to be much larger.

In this context, you should choose a short focal length that is lesser than 1 meter when you want to create a magnifier in convex lens because the nearer the object is to the lens, the larger would be the image formed.

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Answer:

i think it is 5 mg is the lowest

Explanation:

Answer:

Work is said to be done when a force applied to an object moves that object. We can calculate work by multiplying the force by the movement of the object.

Answer:

Work is done by a force on an object if (i) a force acts on the object and (ii) the object is displaced from its original position

Answer:

Change in velocity

−2−10=−12

Time required is 4 seconds

a=Δv/t

=−12/4

=−3m/s²

Hence,

option C is correct answer.

Answer:

has f uped hands

Explanation:

The final velocity is 43.4 m/s. As we can see in the calculation.

Acceleration is a measure of how quickly an object changes its velocity. It is defined as the rate of change of velocity with respect to time. Mathematically, acceleration is represented by the symbol "a" and can be calculated using the following formula:

a = v - u / t

We have that;

v = u + gt

v = final velocity

u = initial velocity

g = acceleration due to gravity

t = time

v = 14 + 9.8 * 3

v = 43.4 m/s

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In the equation for change in free energy for a non-equilibrium system, the change in free energy depends on: all of the above. The correct option is D

The standard free energy change is the change in free energy when the reaction occurs at a certain temperature and pressure, while the absolute temperature is the temperature of the system at the given pressure. The reaction quotient is the ratio of the reaction's forward and reverse rate constants.

Together, these three elements can provide an accurate calculation of the change in free energy for a non-equilibrium system. The standard free energy change (ΔG°) is the energy released or absorbed in a reaction when it occurs at a specific temperature (T) and pressure (P).

The absolute temperature (T) determines the direction of a reaction as reactions tend to move in the direction of increased entropy. Finally, the reaction quotient (Q) measures the relative concentration of reactants and products present in the system.

In summary, the equation for the change in free energy for a non-equilibrium system depends on the standard free energy change, the absolute temperature, and the reaction quotient. All three of these elements are necessary to accurately calculate the change in free energy of a reaction occurring under non-equilibrium conditions.

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Complete Question:

In the equation for change in free energy for a non-equilibrium system, the change in free energy depends on:

a- the standard free energy change

b- the absolute temperature

c- the reaction quotient

d- all of the above