a sound power level reading of 127 db was taken near a construction site where chippers were being used. when all but one of the chippers stopped working, the sound power level reading was 120 db. estimate the number of chippers in operation when the reading of 127 was obtained.

Answer:

v=1.132m/s

Explanation:

velocity=total distance/ total time

first convert 1km to m so that would be 1000m then add the total distance so 200+1000=1200. 1200 is the total distance. now add the total time so we need to convert 15 min to sec which is 900 sec. 160 +900=1060. now divide total distance by total time.

v=?

d=1200m

t=1060s

v=d/t

v=1200m/1060s

v=1.132m/s

Standard computed tomography X-rays are a type of x-ray machine that includes pieces of high-resolution fixed x-ray equipment that allow physicians to diagnose and perform surgery in a minimally invasive manner.

X-ray imaging equipment includes X-ray machines. Since many years ago, X-rays, a type of electromagnetic radiation, have been employed in the medical industry. With the help of this technology, we have been able to see images of our internal organs, including the heart, lungs, and even bones. Electromagnetic radiation such as X-rays can reflect off a variety of materials. Some substances have a high density, whilst others have a low density.

Standard computed tomography X-ray machines are employed for airport security as well as in the medical industry.

These X-rays can image a variety of body areas, including bones, skin, lungs, and the heart, due to their strong X-ray radiation power. Additionally, CT scans are frequently used in X-rays to image organs like the brain that are invisible to traditional X-rays.

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A planar motion known as a projectile occurs when at least two position coordinates change at once. The following two elements can be separated out of the projectile's projection velocity.

The gravitational effect of gravity causes the projectile's vertical velocity to continuously decrease.

Initial vertical velocity is given by ux = u sinФ.

Ay = -g for acceleration along the vertical.

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1.016 nm is  the shortest-wavelength x rays produced by the television

E = hc/λ

13200×1.6×10-19 = 6.62×10-34 ×3×108 /λ

2.11×10^-17=2.144×10^-31/λ

λ = 1.016 nm

Since the relationship between wave frequency and wavelength is inverse, gamma rays have extremely tiny wavelengths that are only a small portion of the size of atoms, whereas other wavelengths can extend as far as the universe. No of the medium they are passing through, electromagnetic radiation's wavelengths are typically expressed in terms of the vacuum wavelength, but this isn't always stated explicitly.

The wavelength of electromagnetic radiation affects how it behaves. Speed of light = wavelength x frequency Energy = Planck's constant x frequency Wave number = 1/wavelength in cm. The wavelengths of different parts of the electromagnetic spectrum are displayed together with a rough approximation of the wavelength size.

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The gravitational force is reduced by a factor of 4 and the distance between two objects is doubled when the radius between them is increased by a factor of 2.

The gravitational force attracts mass-containing objects to one another. We frequently reflect on the gravitational pull of the Earth. This force keeps your body rooted to the ground. In light of the fact that the gravitational force is inversely proportional to the mass of the two interacting objects, heavier objects will be drawn by stronger gravitational forces. The gravitational pull between two objects therefore increases as their relative masses do.

The radius of a circle is the separation from its centre to its edge. Always, the radius is half as big as the diameter. To obtain the formula, multiply the diameter by two.

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A 1.0 N metal disk rest on an index card that is balanced on the top of the glass, then the net force acting on the disk is 0 N.

A force in physics is an effect that has the power to alter an object's motion. A mass-containing object's velocity can alter, or accelerate, as a consequence of a force. Intuitively, a push or even a pull can also be used to describe force. Being a vector quantity, a force also has magnitude and direction. The SI unit of newton is often used to measure it (N). The letter F stands for force.

As per Newton's second law's initial conception, an entity's net force is equal to the speed at which its momentum is changing over time.

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The acceleration would be produced by the same force applied to a 9. 1 kg mass is 0.68 m/s².

Newton's second law states, the acceleration of an object depends directly on the net force acting on the object, and inversely on the mass of the object. The formula F = ma

Perimeter

F₁ = F₂

m₁ × a₁ = m₂ × a₂

2.2 × 2.8 = 9.1 × a₂

6.16 = 9.1 × a₂

[tex]a_2 = \frac{6.16}{9.1}[/tex]

a₂ = 0.68 m/s²

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The parallax angle for this star is 0.1 seconds of arc.

Parallax angle How astronomers use angle measurements to calculate distances in space. The parallax angle is the angle between the Earth one season of the year and the Earth six months later, as measured from a nearby star. Astronomers use this angle to determine the distance of this star from Earth.

Parallax is based on an optical illusion. Because the human eye perceives nearby objects as larger than distant objects, distant objects appear to move slowly. The illusion has long been translated into parallax in various media to facilitate realistic effects. Parallax is a method based on measuring the two angles and sides of the triangle formed by the star and the Earth after 6 months.

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The phase in degree and radians is 2π/6 radian.

Solution:

1/6 cycle

1/6 cycle = 1/6 × 2π = 2π/9 radian

Phase angles are measured in radians. A radian is an angle whose arc length equals its radius. One rotation is equivalent to 2π radians or 360 degrees. In electronic signals, phase is the position of the wave at a particular point in time in the waveform cycle. It measures exactly where the wave is within its cycle.

Phase is the position of the instant in the cycle of the waveform. Phase is a dimensionless quantity. A complete cycle is called a phase. Phase is also expressed in radians. Phase is a measure of the relative time difference between two sine waves. Phase is actually a time difference but is most often measured in degrees or radians.

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The force that causes centripetal acceleration of a car making a turn on a flat road is friction

The centripetal acceleration is required to create a centripetal force. The centripetal force that cause an object to turn in a circular path is due to the force of friction between the tyres and the road. The magnitude of centripetal force is numerically equal to the magnitude of frictional force.

Fc = f

m v² / r = μ N

Fc ∝ 1 / r

The larger the centripetal force the the smaller the radius of curvature.

Therefore, the force that causes centripetal acceleration of a car making a turn on a flat road is friction

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Answer:

900 N

Explanation:

Simple to remember formula:

F = m * a

  = 300 * 3  = 900  N

Answer:

See below

Explanation:

1A 2D 3B 4C

The correct answer is 90pi in ^2/min.

Area of the spill

Area of the spill=S=πr²

dS/dr=(πr²)=2πr

Radius change with speed=dr/dt =2.5(m/s)

Area of the spill will increase with speed

dS/dt = dS/dr × dr/dt =2πr ×dr/dt

=2π×18×2.5

=282.74

Therefore the area in which the paint spilled is increasing with speed. The rate at which the area of spill is increasing is 90pi in²/min.

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Answer:

transversal

Explanation:

or transverse line

The velocity of cart B is 1.73 ft/sec moving towards Q at instant when cart A is 5 ft away from Q .

We have given in question that,

length of rope (l) = 39 ft

the distance between pully point P and horizontal point Q = 12 ft

velocity of cart A = 4 ft/sec

let a = position of cart A relative to Q =0

b = position of cart B relative to Q =0

we want to find out value of db/dt when a = 5 ft .

da/dt = velocity of cart A = 4 ft/sec

Now, consider right angle triangle PQB,

(PB)² = 12² + b² ---(1)

(PA)² = 12² + a² (right angle triangle PQA)

39 = (PA)² + P² = √144+b² + √ 144+a²

so, 39 = √144+b² + √144+ a² ---(2)

differenating equation (2) with respect to time t

we get,0 = b/√144+b² × db/dt + a/√144+a² ×da/dt -----(3)

from equation (2) put a = 5 (given)

39 = √144+b² + √144+25 = 13 + √144+b²

144 + b² = (39-13)² = 676 => b² = 532

=> b = +√532 , b= -√532 but b is on negative side of Q= 0 so, b = -√532

Now, putting value of b, a, da/dt in equation (3)

0 = (-√532 /√144+532 )× db/dt + (5√144+25 )× 4

=> 0 = (-√532/26) × db/dt + 20/13

=> db/dt = ( 20/13 )(26/√532) = 40/√532

= 1.73 ft/sec

Hence , the velocity of cart B moving towards Q is 1.73 ft/sec when cart A is 5 ft away from point Q.

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The material that is the best conductor of heat is aluminum which takes 15 minutes to melt the ice water.

Time taken by different materials to melt ice,

The order of better conductors is,

Aluminum > Glass > Plastic > Foam

A conductor is a material that allows heat and current to flow through without any resistance. The better the conductor lesser will be the resistance. Metals are good conductors.

Therefore, the best conductor of heat is aluminum

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The frequency of a radio wave with a wavelength: Frequency of oscillation x wavelength = speed of light

If we have other measurements we can use this relationship to find the wavelength or frequency of the electromagnetic wave. Just divide the speed of light by the measurement you have and you'll get the other.By counting the number of wavefronts that pass a fixed point in a second or so, you can measure the frequency of a wave.

The higher the number the higher the wave frequency. Natural sources of radio waves include astronomical radio sources in space, such as the sun, galaxies, and nebulae as well as radio noise generated by lightning and other natural processes in the Earth's atmosphere. All warm objects radiate high frequency radio waves as part of their black body radiation.

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Alternating current is also known as mains power, domestic power supply, domestic power supply, mains power supply, or wall power supply, as it is the voltage supplied by the outlet.

The rate of change of direction is typically 50 to 60 times per second and is called hertz (Hz). There are three main types of power supplies.

Uncoordinated (also known as brute force), Linear Coordinated, and Switching. A fourth type of power circuit, called ripple regulation, is a hybrid of "brute force" and "switching" designs and deserves its own subsection. One way to tell if you're using an AC-DC adapter or a DC-DC model is to check the device itself. Input and output information is often displayed somewhere in the interface. If the input is AC, it is an AC-DC power supply; if both input and output are DC, it is a DC-DC model.

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According to relativity, the clocks on the spaceship move more slowly when viewed from the spaceship.

Relativity is the measure of relative motion of objects.

According to Einstein's theory of relativity in 1905 its postulates state that

Now, since Clocks on a spaceship moving at high speed relative to the earth. Since the clock on the spaceship is moving, using the third postulate, we see that the clock on the spaceship runs more slowly when viewed from the spaceships moving frame, since it is moving relative to the earth.

So, we can see that the clocks on the spaceship move more slowly when viewed from the spaceship.

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Let Distance moved by objects x = 45cm.

Velocity can be easily calculated by multiplying the centroid distance between the previous frame and the current frame by the frame rate of the video and scaling the units to meters pixels. Average velocity is defined as the change in position or displacement divided by the time interval over which the displacement occurs.

Average velocity can be positive or negative depending on the sign of the shift. From a particle's velocity versus time graph, its average velocity can be found by calculating the total area under the graph and dividing it by the appropriate time interval. For particles with uniform acceleration, the velocity-time graph is a straight line. Calculate acceleration by dividing the change in velocity by the change in time.

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The probability density function (pdf) for the uniform distribution has the basic formula: f(x) = 1/ (B-A) for A x B.

A continuous probability distribution, the uniform distribution is concerned with equally likely outcomes. It is referred to as having a rectangular distribution on the interval [a,b] or having a uniform distribution for the continuous random variable X. Above is a representation of the probability density function of a continuous uniform distribution. The probability of drawing a heart, club, diamond, or spade is equally likely; hence, the area under the curve is 1, which makes sense given that the total of all probabilities in a probability distribution is 1.

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The relationship between acceleration velocity and time is v(t)=at.

What is velocity?

The speed of something in a given direction.velocity is the directional speed of to an object in motion as an indication of its rate of the  change in position as in observed from a particular to frame of reference and it's as measured by a particularly standard of time.

Sol-As per the newton's first law of motion.

Vt= vo+at

Here,

Velocity at time t is v(t).

Initial velocity is vo.

Accelaration is a and the time is t.

The initial velocity is zero.Put the 0 for vo in above equation.

v(t) = 0+at

v(t)= at

Thus, the aceelaration of a falling body (a), the time it takes to fall (t), and its instantaneous velocity when it hits the ground.

(V) is v(t) = at.

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Using the concepts of Extensive and Intensive Properties, we got The specific volume of a substance is the volume per gram of substance. It is an example of physical extensive property.

Physical characteristics of matter are classified into two types: intense properties and extended properties.

An extensive property is a property that is affected by the amount of materials in a sample. Mass and volume are the two examples of extensive characteristics. An intense property is a property of matter that is determined only by the kind of matter in a sample and not by its quantity.

All the specific properties are extensive properties. It can be understood with the example of a specific volume, which is defined as the volume per gram of substance. Therefore, it includes mass.

Thus, it is an extensive property.

Hence, The specific volume of a substance is the volume per gram of substance. It is an example of physical extensive property.

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Answer:

Explanation:

11.535 newtons

Answer:

4 m/s

Explanation:

momentum = m v

    14           = 3.5  * v

v = 14/3.5 = 4 m/s

The quantity of light energy emitted at 40W, in five minutes or 300 seconds will be 1200J.

Equation:

40 W total power

40 W = 40 J/s (joules per second)

10% efficiency

Efficiency x Power Equals Actual Power output

40x0.1 = 4W

Power x Time Equals Energy

300 s x 4 W = 1200 J

Energy of Light = 1200 J

Things like stars, lightbulbs, lasers, and hot objects all emit light energy. Light energy travels from stars like our Sun to the Earth. A natural source of light energy is the Sun.

The electromagnetic spectrum is much larger than the light we can see, which is made up of each hue in the rainbow. Other forms of light include those that are invisible to the human sight, such as radio waves, microwaves, infrared radiation, ultraviolet rays, X-rays, and gamma rays.

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The induced drag coefficient of the plane is 0.0067

In aerodynamics, drag caused by lift, induced drag, vortex drag, or drag due to lift is the aerodynamic drag that occurs when a moving object redirects the airflow coming over it.

Given,

Weight (w) = 9800 N

Wing area (A) = 16.2 m²

Span efficiency factor (E) = 0.62

Zero-lift drag coefficient (CD0) = 0.03

Velocity (v) = 725 km/h = 300 km/h or 83.34 m/s

Density of air (p) = 1.225 kg/m³

Aspect ratio (AR) = 7.31

W = ¹/₂ pv²×A×Cl

Cl = lift coefficient    

Cl = 2w/pARv²

Cl = 2×9800/1.225×7.31×83.34²

Cl = 0.31

Coefficient of induced drag (Cdi) = Cl²/π×E×AR

Cdi = 0.31²/3.14×0.62×7.31

Cdi = 0.0067

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Answer:

(C)

Explanation:

i took the test and please make me the brainlest

The angular momentum quantum number / azimuthal quantum number for the magnetic quantum number of 8 is 7/2

The magnetic quantum number of the atom = 8

The azimuth (or orbital angular momentum) quantum number describes the shape of a particular orbital. This is denoted by the symbol 'l' and its value is equal to the total number of angular nodes in the trajectory. Azimuthal quantum number values ​​can indicate either s, p, d, or f subshells with different shapes.

The angular momentum or azimuthal quantum number can be found using the formula,

                      m = 2l + 1

where m is the magnetic quantum number

           l   is the azimuthal quantum number

Let us substitute the known values in the above equation, we get

                   8 = 2l + 1

                  2l = 8 -1

                  2l = 7

                    l = 7/2

Therefore, the angular momentum quantum number is 7/2

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