which range is the approximate audible range for humans?
a. 20-20 000Hz
b. 20-80 000Hz
c. 67-45 000Hz
d. 2000-110 000Hz

Answer:  NOx and VOC combine chemically with oxygen to form ozone

Explanation:

Answer:

A.The sound waves from the two trombones have slightly different frequencies.

Explanation:

This is because, a difference in frequency of waves from two different sources would result in either constructive or destructive interference of the waves. Thereby, causing the observer to hear the sound increasing or decreasing.

Answer:

A.The sound waves from the two trombones have slightly different frequencies.

Answer:

10hr

Explanation:

To get time of journey, we need calculate distance/speed. distance is 600, speed is 60, so answer is 600/60=10(hours)

Hope that this was helpful.

The velocity of the trolley system with the block in it is 1.33 m/s.

Weight of the block, W = 30 N

Mass of the block, m = W/g

m = 30/10 = 3 kg

Mass of the trolley, M = 6 kg

Initial velocity of the trolley, u = 2 m/s

According to law of conservation of momentum,

In an isolated system, when two objects collide, the combined momentum before and after the collision is constant. Due to the fact that the momentum gained by one object equals the momentum lost by another, this occurs.

So, the momentum of the trolley system before and after dropping the block to it are equal.

Mu = (M + m)v

Therefore, the velocity of the trolley system with the block in it,

v = Mu/(M + m)

v = 6 x 2/(6 + 3)

v = 12/9

v = 1.33 m/s

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Answer:

   I = 2.667 kg m²

Explanation:

The moment of inertia of a body can be calculated by the expression

         I = ∫ L² dm

For high symmetry bodies the expressions of the moment of inertia are tabulated, for a rod with its axis of rotation at its midpoint it is

         I = \(\frac{1}{12}\) m L²

let's calculate

         I = \(\frac{1}{12}\)  2  4²

         I = 2.667 kg m²

Answer:

a)  \(v_{oy}\) = 0,  b)  t = 9.035 s, c) x = 587.275 m, d)  v_y = -88.54 m / s,

e) v = 109.84 m / s,  f)  θ = -53.7º

Explanation:

This exercise is a projectile launch

a) as the projectile is launched horizontally, its initial vertical velocity is zero

          \(v_{oy}\) = 0

b) let's use the relation

          y = y₀ + v_{oy} t - ½ g t²

when reaching the ground y = 0 and the initial vertical velocity is v_{oy}=0

         0 = y₀ + 0 - ½ g t²

         t = \(\sqrt{ \frac{2 v_o}{g} }\)

         t = \(\sqrt{ \frac{ 2 \ 400 }{ 9.8} }\)

         t = 9.035 s

c) the horizontal distance is

         x = v₀ₓ t

         x = 65  9.035

         x = 587.275 m

d) the vertical speed when touching the ground

         v_y = \(v_{oy}\) -gt

         v_y = 0 - 9.8 9.035

          v_y = -88.54 m / s

the negative sign indicates that the velocity is directed downwards

e) the velocity at this point

          v = \(\sqrt{ v_x^2 + v_y^2}\)

          v = \(\sqrt{65^2 + 88.54^2}\)

          v = 109.84 m / s

f) the direction of the velocity

let's use trigonometry

          tan θ = v_y / vₓ

          θ = tan⁻¹1 v_y / vₓ

          θ = tan⁻¹ (-88.54 / 65)

          θ = -53.7º

this angle is measured clockwise

The 13th Amendment to the United States Constitution provides that "Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction."

In other words:

Nobody can be a slave or work against their will in any place controlled by the USA, except if they're sentenced to jail or prison for a crime.

The 13th amendment, which was adopted by Congress on Jan 31, 1865, and ratified by the states on December 6, 1865, declared slavery to be illegal throughout the country and in any location under their jurisdiction. It also states that "Neither “ neither slavery nor involuntary, except as a punishment for offense whereof the group shall have indeed been duly found guilty, shall exist."

An amendment can change or add to the terms of a contract or other legal document. A latest arrival or alteration to a document that substantially preserves its integrity is called an amendment.

Common synonyms for amend include correct, emend, rectify, redress, reform, remedy, and revise. All of these words pertain to "setting right what's genuinely wrong," but only amend, reform, and revise suggest improvement via corrective revisions, with amend often denoting minor changes alter a law.

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Let west be the negative direction, and east be positive. Then the total momentum of the system is conserved such that

(3.00 kg) (-2.00 m/s) + m (1.50 m/s) = 0

Solve for m :

m = (3.00 kg) (2.00 m/s) / (1.50 m/s) = 4.00 kg

The resistance is 6.84 ohms, the current is 52.78 A, and the amount of energy produced is 5,400,000 J, or 1.5 kWh.

Accordingly, a 3kW heater will consume 3kW (3000 watts) every hour and run about 43 pence*, or £3.43* for 8 hours. The operating costs will depend on the power rating (watts/kWs); the higher the watts, the more it will cost to operate. Visit Sust-it's Electric Heating Cost Calculator for a quick comparison.

To find the current:

I = P/V = 19,000 W / 360 V = 52.78 A

To find the resistance:

R = V²/P = (360 V)²/ 19,000 W = 6.84 ohms

To find the energy generated in joules:

E = P * t = 19,000 W * (50 min * 60 s/min) = 5,400,000 J

To find the energy generated in kW-h:

E_kWh = E / (3.6 * 10⁶ J/kWh) = 1.5 kWh

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Answer:

YES the first option

Explanation:

two atom are held together

Answer:

In a covalent bond, two atoms are held together by the attraction between each atom and the shared electrons. The number of covalent bonds that an atom can form depends on the number of valence electrons in the atom.

The wavelength of the wave will be 4 meters. when 5 complete waves occupy a length of 20m.

Wavelength is defined as the space between waves' crests, particularly between electromagnetic or sound wave points. A recurring event's frequency is measured by how many times it occurs in a unit of time. To underline the difference from spatial frequency, it is also occasionally referred to as temporal frequency.

There is an inverse relationship between the frequency and the wavelength of the waves as the wavelength increases the frequency decreases and if the wavelength decreases the frequency increases.

Given that a wave has 5 complete waves occupying a length of 20m. The wavelength of the wave will be calculated as below:-

λ = Distance / frequency

λ = 20 / 5

λ = 4 meters

Therefore, the wavelength of the wave will be 4 meters. when 5 complete waves occupy a length of 20m.

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Material strength to weight ratio refers to the amount of strength possessed by a material compared to its weight. It is used to evaluate a material's ability to endure loads while maintaining its lightweight.

Strength-to-weight ratio:

There are two methods to describe the strength-to-weight ratio of materials: specific strength and specific stiffness. Specific strength refers to a material's maximum strength divided by its density, whereas specific stiffness refers to a material's modulus of elasticity divided by its density.

In the aerospace industry, the material strength-to-weight ratio is crucial since it determines the efficiency of aircraft, rockets, and spacecraft. Materials with high strength-to-weight ratios, such as carbon fiber composites, are frequently used to create strong, lightweight components for these purposes, resulting in a reduction in fuel consumption and greater overall efficiency.

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Answer:

a luminous ball of plasma

Natural gas was the largest source about 38% of U.S. electricity generation in 2021. Natural gas is used in steam turbines and gas turbines to generate electricity.

Tyler wants to learn about the types of insects in the soil near his house. He could collect a large amount of data for a low cost.

Descriptive investigation, comparative investigation, and experimental investigation are the three types of investigations that scientists use to research and create explanations for events in nature.

Providing descriptions is the aim of descriptive research. It should describe phenomena in a factual, precise, and organized manner without attempting to infer their causes. It does not provide an explanation for the how, when, or reasons why a specific phenomenon occurred.

In various situations, scientists employ a variety of investigational techniques. These techniques include fair testing, identifying and classifying, modeling, pattern seeking, and researching (in no particular order). According to research, fair testing dominates science instruction.

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An acceptable charging circuit voltage for a 12-volt system typically ranges from 13.5 to 15 volts. The correct option is A.

This voltage range is crucial for maintaining the battery's health and ensuring that it operates efficiently. The charging circuit, which consists of the alternator, voltage regulator, and wiring, maintains the battery's charge and provides electrical power to the vehicle's systems.

The alternator, driven by the engine, generates electrical power, while the voltage regulator controls the output voltage to prevent overcharging or undercharging.

When the engine is running, the charging circuit must supply enough voltage to recharge the battery after starting and provide power to the vehicle's electrical systems without overloading the battery.

A voltage range of 13.5 to 15 volts ensures that the 12-volt battery is sufficiently charged, and its capacity is maintained at an optimal level.

Overcharging (above 15 volts) can cause excessive heat, leading to battery damage or failure, while undercharging (below 13.5 volts) can result in reduced battery life and inadequate power for the vehicle's electrical systems.

To summarize, for a 12-volt system, the acceptable charging circuit voltage is 13.5 to 15 volts, as this range allows for efficient battery charging, optimal performance, and extended battery life.

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The forces exerted by the pillars when a 90.0 kg diver stands at the far end of a 5.00 m long diving board with a mass of 6.6 kg supported by two pillars, one at the left end of the diving board, and the other 1.50 m away are 512 N and 490 N. Here options B and D are correct.

The answer to the first question is B) Counterclockwise. This is because the force applied by the adult is not directly over the pivot point, so it creates a torque that causes the teeter-totter to rotate in the counterclockwise direction.

To answer the second question, we can use the principle of torque equilibrium, which states that the sum of the torques acting on an object must be zero for it to be in rotational equilibrium. In this case, we can consider the diving board and the diver as a system.

When the diver stands at the far end of the board, the board experiences a torque due to the weight of the diver, which is given by:

τ = F × d

where F is the weight of the diver, and d is the distance from the pivot point to the point where the weight acts. Since the weight of the diver is acting downwards, the torque is acting in the clockwise direction.

At the same time, the two pillars are exerting forces on the board to support its weight and the weight of the diver. Let's call the force exerted by the pillar at the left end of the board \(F_1\), and the force exerted by the pillar 1.50 m away \(F_2\). Since the board is in static equilibrium, the sum of the forces acting on it must be zero. This gives us:

\($F_1 + F_2 - F_g = 0$\)

where \(F_g\) is the weight of the board, including the weight of the diver We can solve for \(F_1\) and \(F_2\) by considering the torque equilibrium equation:

\($\tau_1 + \tau_2 - \tau_g = 0$\)

\($\tau_1 = F_1 \times 0 = 0$\)

\($\tau_2 = F_2 \times 1.50 \text{ m}$\)

Substituting these values and the torque due to the weight of the board and the diver into the torque equilibrium equation, we get:

\($F_2 \times 1.50 \text{ m} - (90.0 \text{ kg} + 6.6 \text{ kg}) \times 9.81 \text{ m/s}^2 \times 2.50 \text{ m} = 0$\)

Solving for F2, we get:

\($F_2 = \frac{(90.0 \text{ kg} + 6.6 \text{ kg}) \times 9.81 \text{ m/s}^2 \times 2.50 \text{ m}}{1.50 \text{ m}} = 512 \text{ N}$\)

Substituting this value of \(F_2\) into the equation for the sum of the forces, we get:

\($F_1 + 512 \text{ N} - (90.0 \text{ kg} + 6.6 \text{ kg}) \times 9.81 \text{ m/s}^2 = 0$\)

Solving for \(F_1\), we get:

\($F_1 = (90.0 \text{ kg} + 6.6 \text{ kg}) \times 9.81 \text{ m/s}^2 - 512 \text{ N} = 490 \text{ N}$\)

Therefore, the forces exerted by the pillars are 490 N and 512 N, which is option D) 512 N and 490 N.

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Complete question:

Which direction does a teeter-totter rotate when an adult applies a force of 95 N at a distance of 2m from the pivot?

A) Clockwise

B) Counterclockwise

C) It does not rotate

D) Cannot be determined

What are the forces exerted by the pillars when a 90.0 kg diver stands at the far end of a 5.00 m long diving board with a mass of 6.6 kg supported by two pillars, one at the left end of the diving board, and the other 1.50 m away?

A) 675 N and 327 N

B) 327 N and 675 N

C) 490 N and 512 N

D) 512 N and 490 N

Answer:

ocean currents

Explanation:

The required rate of return on a bond fell by 0.5 percent from 9.7 percent to 9.2 percent, the fair present value rose from $945 to $970. The bond pays interest annually. The duration of the bond is approximately -0.026.

To calculate the duration of a bond, we need to use the formula

Duration = (ΔPV / PV) / Δy

Where

ΔPV is the change in present value (PV)

PV is the initial present value

Δy is the change in yield (required rate of return)

Given the information provided:

Initial PV = $945

New PV = $970

Initial yield = 9.7%

New yield = 9.2%

Calculate the change in present value:

ΔPV = New PV - Initial PV

ΔPV = $970 - $945

ΔPV = $25

Calculate the change in yield:

Δy = New yield - Initial yield

Δy = 9.2% - 9.7%

Δy = -0.5%

Now we can calculate the duration:

Duration = (ΔPV / PV) / Δy

Duration = ($25 / $945) / (-0.005)

Duration ≈ -0.026

The duration of the bond is approximately -0.026. Note that the duration can be negative if the change in yield and change in present value have opposite signs.

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Answer:thanks

Explanation:xixo

gv

Answer:

(AIDS) is a chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV). By damaging your immune system, HIV interferes with your body's ability to fight infection and disease. HIV is a sexually transmitted infection (STI). It can also be spread by contact with infected blood or from mother to child during pregnancy, childbirth or breast-feeding.

Explanation:

To help prevent the spread of HIV: 1. Use treatment as prevention (TasP). If you're living with HIV, taking HIV medication can keep your partner from becoming infected with the virus.

In the event of an accident or a car crash, road safety barriers and fences prevent automobiles from running off the road.

Newton's Three Laws of Physics can help explain what these safety barriers are and how they help to save lives during car accidents :

I.  Unless acted upon by an imbalanced force, an object at rest will remain at rest, and an object at constant velocity will remain at constant velocity.

II.  If an imbalanced force occurs, a mass will experience acceleration proportional to its magnitude.

III.  When you apply a force to an object, you will feel a force that is equal    in magnitude but opposite in direction.

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The total distance traveled in one full cycle of simple harmonic motion is twice the amplitude (A) of the oscillation.

Hence, the correct option is C.

The total distance traveled by the block in one full cycle of its motion can be determined by analyzing the nature of simple harmonic motion.

In simple harmonic motion, the block oscillates back and forth around its equilibrium position. During one complete cycle, it moves from its initial position to one extreme position, then returns to the equilibrium position, and finally moves to the other extreme position before returning back to the equilibrium position again.

The total distance traveled in one full cycle of simple harmonic motion is twice the amplitude (A) of the oscillation. This is because the block travels a distance of A in one direction to reach the first extreme position, and then it travels the same distance of A in the opposite direction to reach the other extreme position.

Therefore, the correct option is (c) 2A.

Hence, the correct option is C.

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Answer:

Explanation:

Yes, the nucleus contains neutrons along with protons.

Answer:

81.6 J

Explanation:

let the acceleration due to gravity = 9.8 m/s/s

W = F • s

F = newtons of force

s = distance travelled

the force to carry a mass is equal to mass multiplied by the acceleration due to gravity. This is confirmed using Sir Issac Newtons second and third law stating that the force of an object is equal to its mass multiplied by its acceleration (F = m • a) and that every action has an equal and opposite reaction, respectively. This means that the force of the object is equal to 8.45kg • 9.8 m/s/s, or 82.81 newtons of force.

F = 82.81 N

To find the distance displaced, you simply subtract 0.835m from 1.82m, giving a value of 0.985m.

s = 0.985m

Finally, in order to find work, you multiply 82.81 N by 0.985m resulting in a work equal to 81.6 J, after being rounded due to match the significant digits of the question.

The change in the kinetic energy of the calcium ion's is 6.4 x 10⁻¹⁶ J.

The change in the kinetic energy of the ion's which accelerated through the given potential difference is calculated as follows;

ΔK.E = qV

where;

Substitute the given parameters in the above equation and solve for change in kinetic energy.

ΔK.E = (2e)V

ΔK.E = (2 x 1.6 x 10⁻¹⁹) x (2.0 x 10³)

ΔK.E = 6.4 x 10⁻¹⁶ J

Thus, the change in the kinetic energy of the calcium ion's is 6.4 x 10⁻¹⁶ J.

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At the center of a quasar is a supermassive black hole that is surrounded by a disc of gas and dust that is heated to incredibly high temperatures. This disc is the energy source of the quasar, as it emits large amounts of radiation and energy.

Over time, the energy source at the center of a quasar can diminish as the black hole consumes the surrounding material. As the material is consumed, the disc of gas and dust becomes smaller, which reduces the amount of energy that is being emitted.

This process can take millions or even billions of years, depending on the size of the black hole and the amount of material that is available. Eventually, the energy source of a quasar can completely run out, which causes the quasar to stop emitting radiation and energy.

At this point, the black hole will still exist, but it will no longer be surrounded by a disc of material that can provide energy. Instead, it will become dormant and will no longer be visible as a quasar.

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Answer:

9172.8 N

Explanation:

F = ma

F = (936 kg)(9.8 m/s^2)

F = 9172.8 N