Which of the following puts the MOST demand on water supplies? Question 18 options: A) flood B) overpopulation C) drought D) pollution

Answer:

The study was unethical

Explanation:

The study was deceptive to the participants, It failed to protect the participants involved and it denied them the right to withdraw from the experiment.

Answer:

Airbags:

" As the airbags comes in inbuilt form these days in most of the cars, as they fulfill the safety concerns of the passengers and make it sure that non of the individuals gets hurt in any accident faced during the travel."

Angle of Deployment:As the airbags will only deploy in the specific conditions provided, as the car must be speed over about the 25 km/hr and the accident must be more like a head-on-collision making the airbags to deploy. Or else if the car experiences an side wise crash with any other entity then it will never deploy in that case.

The energy change associated with the transition from n = 3 to n = 2 in the hydrogen atom is about -3.03 × 10⁻¹⁹ J

[tex]\texttt{ }[/tex]

The term of package of electromagnetic wave radiation energy was first introduced by Max Planck. He termed it with photons with the magnitude is :

[tex]\large {\boxed {E = h \times f}}[/tex]

E = Energi of A Photon ( Joule )

h = Planck's Constant ( 6.63 × 10⁻³⁴ Js )

f = Frequency of Eletromagnetic Wave ( Hz )

[tex]\texttt{ }[/tex]

The photoelectric effect is an effect in which electrons are released from the metal surface when illuminated by electromagnetic waves with large enough of radiation energy.

[tex]\large {\boxed {E = \frac{1}{2}mv^2 + \Phi}}[/tex]

[tex]\large {\boxed {E = qV + \Phi}}[/tex]

E = Energi of A Photon ( Joule )

m = Mass of an Electron ( kg )

v = Electron Release Speed ( m/s )

Ф = Work Function of Metal ( Joule )

q = Charge of an Electron ( Coulomb )

V = Stopping Potential ( Volt )

Let us now tackle the problem !

[tex]\texttt{ }[/tex]

Given:

initial shell = n₁ = 3

final shell = n₂ = 2

Unknown:

ΔE = ?

Solution:

We will use this following formula to solve this problem:

[tex]\Delta E = R (\frac{1}{(n_2)^2} - \frac{1}{(n_1)^2})[/tex]

[tex]\Delta E = -2.18 \times 10^{-18} \times ( \frac{1}{2^2} - \frac{1}{3^2})[/tex]

[tex]\Delta E = -2.18 \times 10^{-18} \times ( \frac{1}{4} - \frac{1}{9} )[/tex]

[tex]\Delta E = -2.18 \times 10^{-18} \times \frac{5}{36}[/tex]

[tex]\Delta E \approx -3.03 \times 10^{-19} \texttt{ J}[/tex]

[tex]\texttt{ }[/tex]

[tex]\texttt{ }[/tex]

Grade: College

Subject: Physics

Chapter: Quantum Physics

Most people perceive the least intense sounds at a frequency around 2000 Hz with an intensity level at the threshold of hearing, which is about 0 dB or 10^-12 W/m².

The frequency at which most people perceive the least intense sounds is typically around the threshold of human hearing. This threshold is at about 0 dB, which corresponds to an intensity level of approximately 10-12 W/m². However, frequency and intensity are not the only factors that contribute to the perception of sound, as the sensitivity of the human ear varies across different frequencies. The human ear has the maximum sensitivity to frequencies ranging from 2000 to 5000 Hz. Sounds at these frequencies are perceived as louder compared to those at lower or higher frequencies, even if they have the same intensity level. Therefore, the least intense sounds that humans can perceive are at the lower end of this range, around 2000 Hz, at the absolute threshold of hearing of 0 dB.

Final answer:

The elastic potential energy of the compressed spring with a spring constant of 19.8 N/cm and compressed 22.8 cm is approximately 51.5 Joules.

Explanation:

The elastic potential energy (EPE) stored in a spring is calculated using the formula EPE = 1/2 k x², where k is the spring constant, and x is the displacement from the spring's equilibrium position. Given that the spring constant is 19.8 N/cm and the spring is compressed 22.8 cm, we must first convert the spring constant to N/m by multiplying by 100, giving us 1980 N/m. Using the formula, the elastic potential energy is thus EPE = 1/2 (1980 N/m) (0.228 m)² = 1/2 (1980) (0.051984) J = 51.504 J. Therefore, the potential energy of the compressed spring is approximately 51.5 Joules.

Answer:

A violin is a both ends fixed, and so successive harmonics are simply multiples of the fundamental:

Therefore, f1 = 440Hz (fundamental frequency)

f2 = 2f1 = 2 x 440 = 880 Hz

f3 = 3f1 = 3 x 440 = 1320 Hz

f4 = 4f1 = 4 x 440 = 1760 Hz

Answer:

"Both Eddie and Val are correct because chemical energy is a type of potential energy and mechanical energy includes kinetic energy."

Explanation:

Answer:

C

Explanation:

now give me brainly please

Answer:

The smaller the amplitude of the wave, the smaller the displacement of the pendulum from the equilibrium position. The shorter the period, the shorter the pendulum’s rod.

To find the right answer, we could look the analysis of a simple pendulum movement. The relation that defines this movement is:

[tex]T=2 \pi \sqrt{\frac{l}{g} }[/tex]

[tex]T: \ period\\l: \ pendulum's \ rod \ length\\g: \ gravity[/tex]

From the equation, we can see the relation between the period and the length of the pendulum's rod. They are directly proportional, this means that if the period increases, the length increases, or vice versa. So, the shorter the period, the shorter the pendulum's rod, because they are directly proportional.

On the other hand, the amplitude of the harmonic motion refers to the displacement of the object from the equilibrium point which is in the center of the periodic movement. This allow us to deduct that if the amplitude is small, the displacement of the object is small, if the amplitude is big, the displacement from the equilibrium point is bid.

Third option is correct. The mass of an object remains same when an unbalanced force is applied to it.

the mass on an object doesn't depend on the applied force. it is constant.When an unbalanced force is applied to an object, it will get accelerated. The velocity of the object will increase or decrease depending on the direction of the force but the mass of the object remains same. That doesn't change with the applied force.

The force require to stop the second object is greater because it has bigger momentum when compared to the first object.

The given parameters;

The force required to stop each object in the given time is determined by applying Newton's second law of motion as shown below;

[tex]F = ma = \frac{mv}{t} \\\\F_1 = \frac{8 \times 0.2}{10} \\\\F_1 = 0.16\ N[/tex]

For the second object;

[tex]F_2 = \frac{4 \times 1}{10} \\\\F_2 = 0.4 \ N[/tex]

Thus, the force require to stop the second object is greater because it has bigger momentum when compared to the first object.

Learn more here:https://brainly.com/question/13164904

At a definite point, the bridge would begin oscillating to the matching rhythm as that of the marching footsteps. This oscillation would touch a determined peak when the bridge can no longer tolerate its own power and later collapses. So, soldiers are systematic to break their steps while passing a bridge.

Soldiers are ordered to 'route step' across a bridge to prevent forced oscillations and resonance that can lead to structural failure if marching is synchronized.

The reason soldiers are usually ordered to "route step" or walk out of step across a bridge has to do with forced oscillations and resonance. When soldiers march in cadence, their synchronized steps act as a periodic force that can cause the bridge to oscillate at its natural frequency if the cadence matches this frequency. This can amplify the oscillations to dangerous levels, potentially leading to structural failure of the bridge. By breaking step, the soldiers apply random forces to the bridge, which decreases the chances of resonance occurring, thus maintaining the structural integrity of the bridge.

Explanation :

There can be many eye defects in the human eye. Some of them are Myopia, Hypermetropia, Astigmatism etc.

In Myopia the size of the eyeball is too long and the image is formed in front of the retina. A person suffering from this defect is not able to see far objects clearly but can see nearby objects normal.

Concave lenses are used to correct this defect so that the image is focused on the retina.

To determine how many electrons are transferred in a lightning strike, you divide the total charge transferred (in this case, 25 coulombs) by the elementary charge which is the charge per electron. The result approximates to 1.56 × 1020 electrons.

The number of electrons transferred during a lightning strike can be determined by dividing the total charge transferred by the charge of a single electron. The charge of a single electron, also known as the elementary charge, is approximately 1.60218 × 10-19 Coulombs. Therefore, if a lightning bolt transfers about 25 Coulombs to the ground, the number of electrons transferred can be calculated as follows:

Number of electrons = Total charge transferred / Charge per electron

= 25 Coulombs / 1.60218 × 10-19 Coulombs

Therefore, a lightning bolt that transfers about 25 Coulombs to the earth transfers approximately 1.56 × 1020 electrons.

https://brainly.com/question/31623799

#SPJ3

Answer:

Sample Response: 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:

SS and Ss

I did the test!!!!

White light is composed of a spectrum of many different colors (Option A).

The spectrum is the variety of colors created when light travels through a glass prism or a drop of water.

White light is a mixture of all the colors of the visible spectrum, which includes red, orange, yellow, green, blue, indigo, and violet. When light passes through a prism, it is separated into its individual colors, creating a rainbow-like effect.

This is because different colors of light have different wavelengths, and a prism bends the light of different wavelengths by different amounts, causing them to spread out and form a spectrum.

So, white light is actually composed of many different colors of light, each with its own unique wavelength.

Learn more about the spectrum here:

https://brainly.com/question/13435566

#SPJ6

Answer:

6,100 N

Explanation:

Answer: apparent weighlessness.

Explanation:

1) Balance of forces on a person falling:

i) To answer this question we will deal with the assumption of non-drag force (abscence of air).

ii) When a person is dropped, and there is not air resistance, the only force acting on the person's body is the Earth's gravitational attraction (downward), which is the responsible for the gravitational acceleration (around 9.8 m/s²).

iii) Under that sceneraio, there is not normal force acting on the person (the normal force is the force that the floor or a chair exerts on a body to balance the gravitational force when the body is on it).

2) This is, the person does not feel a pressure upward, which is he/she does not feel the weight: freefalling is a situation of apparent weigthlessness.

3) True weightlessness is when the object is in a place where there exists not grativational acceleration: for example a point between two planes where the grativational forces are equal in magnitude but opposing in direction and so they cancel each other.

Therefore, you conclude that, assuming no air resistance, a person in this ride experiencing apparent weightlessness.

The center of mass and speed can be calculated using the formulas provided. Adding a fifth mass at either the origin or the current center of mass will affect the location of the center of mass, but it can only be determined with knowledge of the mass of the new particle.

The center of mass for a system of particles can be calculated using the following formulas: Xcm = ∑mi xi/mi and Ycm = ∑mi yi / ∑ mi, where 'mi' denotes the mass of the ith particle and 'xi' and 'yi' are the x and y coordinates respectively. This principle extends not just to two dimensions but also to three dimensions.

The speed of the center of mass of a group of particles can be calculated by the formula Vcm = ∑mi vi / ∑ mi, where 'vi' is the vector sum of the velocities of the particles, and 'mi' is the mass of the ith particle.

When a fifth mass is placed at the origin, the location of the center of mass can only be determined if the mass is known. Similarly, when a fifth mass is placed at the center of mass, the new location depends on the mass of the fifth particle and cannot be determined otherwise.

https://brainly.com/question/33607198

#SPJ3

Answer:

Angular acceleration, α = -2βt

Explanation:

Angular velocity of fan is [tex]\omega_{z(t)}=\gamma -\beta t^2[/tex]

[tex]\gamma=4.90\ rad/s[/tex]

[tex]\beta=0.750\ rad/s^3[/tex]

Angular acceleration is given by :

[tex]\alpha=\dfrac{d\omega}{dt}[/tex]

[tex]\alpha=\dfrac{d(\gamma -\beta t^2)}{dt}[/tex]

[tex]\alpha=-2\beta t[/tex]

Hence, the above equation is the angular acceleration as a function of time.   

0.35 m is the maximum distance that the block will compress the spring after the collision.

Given :

Mass, [tex]\rm m_b = 15 \;Kg\;and\; m_s = 3\;Kg[/tex]

Spring constant, K = 500 N/m

Solution :

Before the collision the total momentum is,

[tex]\rm p_i = m_s \times v_s[/tex]

Whare [tex]m_s[/tex] is mass of stone and [tex]\rm v_s[/tex] is the velocity of stone beforethe collision.

After the collision stone and block both are moving therefore total momentum is,

[tex]\rm p_f = m_sv_s' + m_bv_b[/tex]

where, [tex]\rm v_s'[/tex] is the velocity of stone after collision, [tex]\rm m_b[/tex] is the mass of block and [tex]\rm v_b[/tex] is the speed of the block after collision.

Now, momentum should be conserve

[tex]\rm p_i = p_f[/tex]

[tex]\rm m_sv_s= m_sv_s'+ m_bv_b[/tex]

[tex]\rm v_b = \dfrac{m_s}{m_b}(v_s - v_s')[/tex]  ------- (1)

[tex]\rm v_s = 8\;m/sec[/tex]      (Given)

[tex]\rm v_s' = 2 \;m/sec[/tex]      (Given)

Now putting the values in equation (1) we get,

[tex]\rm v_b = \dfrac{3}{15}(8-2)[/tex]

[tex]\rm v_b = 2\;m/sec[/tex]

Therefore, block slides with the speed of 2 m/s to the right after the collision.

We know that the block starts to move with speed 2 m/s, so its kinetic energy is

[tex]\rm K = \dfrac{1}{2}m_bv_b^2[/tex]

As the spring is compress, block speed decreases and its kinetic energy is converted into elastic potential energy of the spring and the elastic potential energy of the spring is,

[tex]\rm U = \dfrac{1}{2} Kx^2_m_a_x[/tex]

Now through conservation of energy we have,

[tex]\rm K = U[/tex]

[tex]\rm m_bv_b^2 = Kx^2_m_a_x[/tex]

[tex]\rm x_m_a_x = \sqrt{\dfrac{m_bv_b^2}{K}}[/tex]----- (2)

Putting the values of  [tex]\rm m_b,\;v_b\;and\; K[/tex]  in equation (2),

[tex]\rm x_m_a_x= \sqrt{\dfrac{15\times2^2}{500}}[/tex]

[tex]\rm x_m_a_x=0.35\;m[/tex]

0.35 m is the maximum distance that the block will compress the spring after the collision.

For more information, refer the link given below

https://brainly.com/question/15707891?referrer=searchResults

The relationship between the force between two magnetic poles and the distance of separation is The magnetic force is inversely proportional to the square of the distance between them.

Coloumb's law of magnetism states the relationship between the magnetic strength of two magnets. The force of attraction or repulsion between two magnets is directly proportional to the strength of magnetic poles and inversely proportional to the square of the distance between them.

Coloumb's law of magnetism describes the electric field between two charged objects. The force of attraction or repulsion is inversely proportional to the absolute permeability of the surrounding medium.

The attractive and repulsive force, F∝ m₁×m₂ / μ₀r², where m₁, and m₂ are the magnetic strength or magnetic poles and r is the distance between two magnets.

The attractive or repulsive force, F = k (m₁×m₂) / μ₀r², where μ₀ is the permeability of the medium and k is the constant of proportionality. The unit is Newton/Tesla. The magnetic force is inversely proportional to the square of the distance of separation.

Hence, the ideal solution is option D.

To learn more about Magnetism:

https://brainly.com/question/2841288

#SPJ2

This question involves the concept of Newton's Second Law of Motion.

The force exerted on the rocket is "5.85 x 10⁷ N".

According to Newton's Second Law of Motion, whenever an unbalanced force is applied to an object, it produces an acceleration in the direction of the force. Mathematically,

[tex]F=ma[/tex]

where,

Therefore,

[tex]F = \frac{m\Delta v}{t}[/tex]

where,

Therefore,

F = (1300 kg/s)(4.5 x 10⁴ m/s)

F = 5.85 x 10⁷ N

Learn more about Newton's Second Law of Motion here:

https://brainly.com/question/23845187

Answer:

The brightness of the beam of light increases.

Explanation:

As per Einstein's experimental verification he proves that light is of particle nature and his equation for energy balance is given as

[tex]h\nu = \phi + KE[/tex]

so incident photons on a photosensitive plate will eject the electrons from the plate with some sufficient KE.

So here light is considered as particles which means one photon will eject one electron. So here intensity of light is considered as

Intensity = (number of photons per second) (energy of one photon)

so it is given as

[tex]I = \frac{N}{t}(\frac{hc}{\lambda})[/tex]

now if the intensity of light is increased for same wavelength of light then it means the number of photon must have to be increase.

so correct answer will be

The brightness of the beam of light increases.