An airplane mechanic notices that the sound from a twin-engine aircraft rapidly varies in loudness when both engines are running. What could be causing this variation from loud to soft?

The density of object 2 is 8000kg/m^3.

d=2d=8000kg/m^3

The substance's density is defined as its mass per unit of volume (volumetric mass density or specific mass). Although the Latin letter D may also be used, the symbol for density that is most usually used is (the lower case Greek letter rho). Mathematically, density is determined by dividing mass by volume.

Weight per unit volume is a common informal definition of density, although this is incorrect scientifically; the exact term is specific weight. The US oil and gas industry serves as one illustration of this.A pure substance's mass concentration in numbers is equal to its density. Density varies greatly between different types of materials and may be significant in terms of packaging, purity, and buoyancy.

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Integers is referred to as the data type that is made up of whole numbers represented as binary values and is therefore denoted as option B.

This is referred to as discrete values which are used to describe information which could be in different forms such as quantity, quality etc.

Integers is referred to the data type which comprises of whole numbers represented as binary values and it could be zero , a positive or negative number and examples include 0, 1, -2 etc. This is therefore the reason why option B was chosen as the most appropriate choice.

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By the velocity, the interval time after the p wave arrived is 6 seconds.

We need to know about velocity to solve this problem. Velocity can be determined as the distance traveled divided by time interval. It can be written as

v = s / t

where v is velocity, s is distance and t is the time interval.

From the question above, we know that.

vp = 5000 m/s

vs = 3000 m/s

s = 45 km = 45000 m

Determine the time taken by p wave

tp = s / vp

tp = 45000 / 5000

tp = 9 seconds

Determine the time taken by s wave

ts = s / vs

ts = 45000 / 3000

ts = 15 seconds

The time interval after p waves is

interval time = ts - tp

interval time = 15 - 9

interval time = 6 second

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The Kinetic energy of the pupil with mass of 55kg swinging back on a chair and falling off at a speed of 0.6 m/s is "9.9 J".

Kinetic energy is defined as the energy possessed by a body due to the virtue of velocity.

the S.I. unit of Kinetic energy is joule .

Kinetic energy is conserved.

velocity is defined as the displacement per unit time.

S.I unit of velocity is m/s.

given:

Mass (m) = 55 kg

velocity (v) = 0.6 m/s

Kinetic energy(K)=1/2×mv²

Kinetic energy (K)=1/2×55×0.36

Kinetic energy (K)= 9.9 joule

therefore,

The Kinetic energy of the pupil with mass of 55kg swinging back on a chair and falling off at a speed of 0.6 m/s is "9.9 J".

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By using uniform motion, the average force is 3106.89 N.

We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule

vt = vo + a . t

vt² = vo² + 2a . s

s = vo . t + 1/2 . a . t²

where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.

From the question above, we know that

vo = 0 m/s

vt = 10.6 m/s

m = 0.85 kg

t = 2.9 ms = 2.9 x 10¯³ second

Find the acceleration by using the first equation

vt = vo + a . t

10.6 = 0 + a. 2.9 x 10¯³

a = 3655.17 m/s²

Find the average force

F = m . a

F = 0.85 . 3655.17

F = 3106.89 N

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The displacement of the dealer's homing pigeon in the car is 12.81 miles.

The displacement of an object is the change in position of an object.

Displacement is a vector quantity because it can be described by both magnitude and direction.

The displacement of the dealer's homing pigeon in the car is calculated as follows;

initial position = 10 miles east

final position = 8 miles south

displacement = √(10² + 8²)

displacement = 12.81 miles

Thus, the displacement of the dealer's homing pigeon in the car is 12.81 miles.

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The average speed of driving the 10 miles would be lower than 35 mph.

The average speed of an object is the ratio of the total distance to the total time of motion of an object.

Mathematically, average speed of an object is given as;

v(average) = total distance / total time

The average speed of a car decreases with increase in the total time of motion.

Due to the many stop lights along the drive, the total of motion of the car will increase will the total distance traveled by the car (10 miles) will be constant.

Also, since the speed limit is 35 mph, the average speed of the car will lower than the 35 mph speed limit.

Thus, the average speed of driving the 10 miles would be lower than 35 mph.

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The speed of sound used in water is 5408 Hz.

(d) The frequency that submarine B is able to detect is   [tex]fo = fs (V -V_O/ v +V_s).[/tex]

                  [tex]=53.273[/tex] × [tex]10 3hz) (1533 m/s + 11 m/s / (45 m/s - 1533 m/s))[/tex]

Frequency [tex]= 5408 HZ[/tex]

Hence, the speed of sound used in water is [tex]5408Hz[/tex].

Submarine, any naval vessel capable of propulsion both below and above the surface of the ocean. Submarines are very distinct from surface ships in terms of appearance and design, making this a unique capacity among warships.

When Germany used them to attack surface merchant ships during World War I (1914–18), submarines initially played a significant role in naval warfare. Torpedo's, a type of self-propelled underwater missile used by submarines, were used as their main armament in such attacks. In World War II (1939–1955), submarines participated in similar operations on a bigger scale, in both the Atlantic (by Germany) and Pacific (by the United States).

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The electric flux is zero through four cube surfaces.

Assuming the charged filament is quite long, and you are not near the edges, the two opposing sides that the filament travels through have no flux. If the charge filament is long, which you may assume is indefinitely long, then there is the equal amount of charge on the left and right of where you are, therefore the electric field has no preference for left or right.

This implies that the electric field can only travel in or out of the filament. No field lines run through the two faces of the cube that the filament goes through if the electric field is not moving left or right. There are electric field lines on the four sides of the filament.

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Answer:

Third answer choice

Explanation:

Dot in the middle and Fn and Fg

Hope this helps! :)

The statements about the skateboarder's energy is true option C which is  if friction is present, mechanical energy will be conserved. the pe is the greatest at the bottom of the ramp.

Energy is the ability to perform a task or do work. Energy can be potential or kinetic energy. Potential energy is the energy posses by a body in a state of rest while kinetic energy is the energy in motion.

As the skateboarder travels  the ramp, potential energy turn to kinetic energy and if  friction is present some of the energy in the system is converted to heat energy.

Therefore, The statements about the skateboarder's energy is true option C which is  if friction is present, mechanical energy will be conserved. the pe is the greatest at the bottom of the ramp.

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The difference in air pressure between the second floor and the top floor of a building is about equal to (1.2)(10)(100) = 1200 N/m2, where air density is equal to 1.2 kg/m3 and gravity acceleration is equal to 10 m/s2.

In physics, gravitational acceleration refers to the speed at which a body falls freely in a vacuum (and thus without experiencing drag). This is the constant acceleration brought on just by the gravitational pull. Gravimetry is the measurement and analysis of these rates. All bodies accelerate at the same rate in vacuum, independent of their masses or compositions.

The combined effects of gravity and the centrifugal force from Earth's rotation cause the Earth's gravity to be as great as it is at a given location on the surface. Depending on height, latitude, and longitude, the free fall acceleration varies at various locations on the surface of the Earth from 9.764 to 9.834 m/s2 (32.03 to 32.26 ft/s2). The exact definition of a conventional standard value is 9.80665 m/s2 (32.1740 ft/s2). Gravity anomalies are areas where this value differs significantly. Other effects like buoyancy or drag are not included in this.

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If the particle's speed is doubled. The momentum's value is then increased by twice.

In Newton's equations of motion, an object's linear momentum, translational momentum, or simply momentum is the product of its speed and mass. Given that it has a dual magnitude and its direction, it is a vector quantity. kg-m/s is the SI unit for momentum.

Let m be the item's mass and v be its speed. Then the momentum is given as,

P = mv   kg-m / s

A particle is traveling less quickly than c / 2. if the particle's speed is twice.

P = m(2v)

P = 2mv

If the particle's speed is twice. The momentum's value is then increased by a factor of two.

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paraffin wax–cs0.33wo3 [cesium tungsten bronze]

Its coating effectively reduce the solar heat gain and air conditioning energy utilization of building because of  high selective NIR

( NIR - near infrared )  absorbing ability.

the solar energy that absorbed by the window glass will overheat the glass due to photothermal conversion of paraffin wax.

to reduce this problem.

A new energy efficient composite window is designed by NIR shielding.

In the composite window the hexagonal phase cs0.33wo3 is prepared by a reaction of solid state then coated on commercial float glass.

cs0.33wo3 in the window reduces the heat gain.

This composite window is expected to better the  energy efficiency of buildings located in the high temp fluctuations.

The given question is incomplete The complete question is.

paraffin wax–cs0.33wo3 composite windows with excellent near- infrared shielding and thermal energy storage abilities

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The resultant  superposition of waves is -1.647cm

We are given that

y₁ = 3.0 cos (4.0x - 1.6t)

y₂ = 4.0 sin (5.0x -2.0t)

where x and y are in centimeters and seconds respectively

It is given that resultant wave is y1+y2

at x=1, t=1

y= y1+y2

 = 3.0 cos (4.0x - 1.6t) + 4.0 sin (5.0x - 2.0t)

  = 3.0 cos ( 4 x 1 -1.6 x1) + 4.0 sin(5 x 1 - 2.0 x 1)

  = 3 cos (2.4rad) + 4 sin(3rad)

   = -2.212 + 0.5645

 =  -1.647cm

Hence the superposition of waves is -1.647cm

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Answer:

a wire carrying a currents creates a magnetic field this can interact with another magnetic field causing a force that pushes the wire at right angles. This is called the motor effect

The number of turns required on the secondary winding is 1,600 turns.

The number of turns needed in the secondary winding is calculated as follows;

Ns/Np = Es/Ep

where;

Ns/80 = 2200/110

Ns = 80( 2200/110)

Ns = 1,600 turns

Thus, the number of turns required on the secondary winding is 1,600 turns.

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In order to make his measurements for determining the Earth-Sun distance, Aristarchus waited for the Moon's phase to be exactly half full while the Sun was still visible in the sky. For this reason, he chose the time of a half (quarter) moon.

It was now possible for another Greek astronomer, Aristarchus, to attempt to determine the Earth's distance from the Sun after learning the distance to the Moon. Aristarchus discovered that the Moon, the Earth, and the Sun formed a right triangle when they were all equally illuminated. Now that he was aware of the distance between the Earth and the Moon, all he needed to know to calculate the Sun's distance was the current angle between the Moon and the Sun. It was a wonderful argument that was weakened by scant evidence. Aristarchus calculated this angle to be 87 degrees using only his eyes, which was not far off from the actual number of 89.83 degrees. But when there are significant distances involved, even slight inaccuracies might suddenly become significant. His outcome was more than a thousand times off.

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Answer:

it moves with a speed of 20m/s and for 10 seconds

Explanation:

using Newton's third law of motion ....s=ut +at/2 ....where s is the distance covered....t time taken ;can be found and since the object was at rest the u ....initial velocity will be 0

The object moves with a speed of 20m/s for time 10 sec.

According to Newton's third law, there is an equal and opposite reaction to every force (action) in nature. When object A pulls on item B, object B pulls back on object A with an equal and opposing force. In other words, interactions lead to forces. The air is diverted downward by an airfoil's action, and the wing is pushed upward as a result. This is the motion of lift from an airfoil.

When a ball is spinning, the air deflects to one side, causing the ball to move in the opposite direction as a response.

When a jet engine is moving, thrust is produced, hot exhaust gases exit the back of the engine, and thrust is generated in the opposite direction.

Using Newton's third law of motion,

where,

s is the distance covered

t time taken ;can be found and since the object was at rest the

u initial velocity will be 0

S = v₀t + [tex]\frac{1}{2}[/tex]at²

S = 0⋅t + [tex]\frac{1}{2}[/tex] ⋅ at²

S = [tex]\frac{1}{2}[/tex] ⋅ at²

t² = [tex]\frac{2s}{a}[/tex]

t² = [tex]\frac{2(200)}{4}[/tex]

t² = 100

t = 10 sec.

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Answer:

01110111 01101000 01111001 0100000 01110100 00100000

The total energy output in 1010 years is therefore equal to (22M + 33S) 1010 kWh.

Energy output in 1010 years will be equal to (22M + 33S) 1010 kWh.

22 windmills make up the model home. M kWh of energy are produced by one wind turbine year. 22 windmills generate 22 M kWh of energy each year. 33 solar panels make up the model home. S kWh of energy is produced by one solar panel annually. Energy produced by 33 solar panels annually equals 33 S kWh.

Now, the total amount of energy produced by 22 windmills and 33 solar panels in a year is equal to (22 M + 33 S) kWh.

One of the most crucial steps you can take to lessen your influence on the environment is to use renewable energy. More than all of our driving and flying put together, electricity production is our main source of greenhouse gases. Clean energy also lessens damaging smog, toxic buildup in our air and water, and the effects of coal mining and gas extraction. It will take time to replace our fossil fuel infrastructure, and clean energy demand from consumers and companies, as well as strong, continuous support from state and federal mandates to create renewable energy generation.

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You should connect two 10 Ohms resistors in parallel and then connect it in series with a 3 Ohms resistors.

In order to achieve the desired resistance under the given circumstances, we would connect two 10 Ohms resistors in parallel and then connect it in series with a 3 Ohms resistors.

Mathematically, the total equivalence resistance of two resistors that are connected in parallel is given by:

1/Rt = 1/R₁ + 1/R₂

1/Rt = 1/10 + 1/10

1/Rt = 2/10

1/Rt = 1/5

Rt = 5 Ohms.

Next, we would connect this 5 Ohms resistor in series with the 3 Ohms resistor:

R₃ = 3 + Rt

R₃ = 3 + 5

R₃ = 8 Ohms.

In conclusion, you can create an equivalent resistance of 8 ohms from only 10 ohms resistors and 3 ohm resistors by connecting two 10 Ohms resistors in parallel and then connect it in series with a 3 Ohms resistors.

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The displacement versus time plots that best represent the student’s trip will be graph C. Then the correct option is C.

The examination of motion without taking the mass or the motion's source into account.

The first student spends some hours in the nest position. so that time and location are represented on a graph from t₀ to t₁.

When a pupil moves slowly in a straight line, their position changes, and their speed increases. Thus, location is represented in the graph by "ab" in the time range from t₁ to t₂.

The condition is shown in the time interval from t₂ to t₃ when the person stops and the velocity is nil.

The constant decrease in velocity and displacement occurs as a student sprint back to her starting position.

Then the correct option is C.

The remaining question is attached below.

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Answer:

Pressure forces heat into food, which triggers the chemical reaction of food. Also entire pot has same temp and pressure. Also successful pressure cooking much like an autoclave requires three things: sustained time, pressure and temperature to be effective.

The given equations of motion are rearranged for the said variables.

In the given equations of motion, the variables used represents:

[tex]v_{f}[/tex] = Final velocity

[tex]v_{i}[/tex] = Initial velocity

Δx = Displacement

a = Acceleration

t = Time

The given equations that are rearranged for said variables are as follows.

Therefore, the given equations of motion are rearranged above for the said variables.

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The energy of a photon with a wavelength of 21 nm is approximately 9.429 x [tex]10^-^1^6[/tex] Joules.

The energy of a photon can be calculated using Planck's equation:

E = (hc) / λ

Where:

Given that the wavelength (λ) is 21 nm (21 x [tex]10^-^9[/tex] m) and using the given value of the Planck constant, we can calculate the energy of the photon:

E = (7 x [tex]10^-^3^4[/tex] x 3.00 x 10^8) / (21 x[tex]10^-^9[/tex] )

When we calculate this, we get the value: 9.429 x [tex]10^-^1^6[/tex] Joules.

Therefore, the energy of a photon with a wavelength of 21 nm is approximately 9.429 x [tex]10^-^1^6[/tex] Joules.

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The electric field outside the cylinder a distance r from the axis. E=6k/λr [k= 1/4πε1]

The electric force per unit charge is referred to as the electric field. It is assumed that the field's direction corresponds to the force it would apply to a positive test charge. From a positive point charge, the electric field radiates outward, and from a negative point charge, it radiates in.

From the point charge, the electric field radiates outward in all directions. Spherical equipotential surfaces are represented by the circles. The vector sum of the individual fields can be used to calculate the electric field from any number of point charges.

E outside of the cylinder is given by:

E(2rL) = L+2rL

q out =3λL

E=0 2rL /3rL

E=6k/λr [k= 1/4πε1]

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The electric field at a point halfway is 18.37 x 10⁵ N/C.

We need to know about the electric fields to solve this problem. The electric field produced by a single-point positive charge is a radial field, whose strength is given by the equation

E = k.Q/r²

where E is the electric field, Q is the charge and r is the radius.

From the question above, we know that

k = 9 x 10⁹ Nm²/C²

Q1 = -5μC = -5 x 10¯⁶ C

Q2 = 4μC = 4 x 10¯⁶ C

x = 21 cm = 0.21 m

from midpoint (r = 0.105 m)

The electric field directly outward from Q2 to Q1 so that the total electric field between the charges will be added up.

Etotal = E1 + E2

Etotal = k.Q1/r² + k.Q2/r²

Etotal = k/r² x (Q1 + Q2)

Etotal = 9 x 10⁹/(0.21)² x (5 x 10¯⁶ + 4 x 10¯⁶)

Etotal = 18.37 x 10⁵ N/C

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Answer:

A?

Explanation:

i don't know correct me if i'm wrong

A family ice show is held at an enclosed arena. The skaters perform to music with level 80.0 db. This level is too loud for your baby, who yells at 75.0 db. 155 db. is the combined sound level.

In physical science, the force or motion of brilliant energy is the power moved per unit region, where the region is estimated on the plane opposite to the heading of spread of the energy. Light force assumes an essential part. With expanded light the fish' s vision improves, and they will turn out to be more careful about hunters.

The formula for intensity is given by, I = P A. Where I am the intensity, P is the power and A is the area of cross section.

The sun' s point decides how much light entering the water. As would be normal, the most elevated measure of sun-based force happens on the globe right where the sun is above and as the point of the sun brings down, the sun-oriented power declines.

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