a high-fidelity sound system may have a frequency range that extends up to or beyond 20,000 hz. what is the purpose of this extended range?

The initial velocity of the car when the brake was initially applied is 6.3 m/s.

option D is the correct answer.

The velocity of the car when the brake was initially applied is calculated as follows;

Mathematically, kinetic energy formula is given

K.E = ¹/₂mv²

where;

mv² = 2 K.E

v² = ( 2 K.E ) / ( m)

v = √ [  ( 2 K.E ) / ( m) ]

Substitute the given parameters and solve of the initial velocity of the car when the brake was applied.

v = √ [  ( 2 x 23,180 ) / ( 1168) ]

v = 6.3 m/s

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The complete question is below:

A 1,168-kg car comes to a stop without skidding. The car's brakes do -23,180 J of work

to stop the car.

Which of the following was the car's velocity when the brakes were initially applied?

A. 3.2 m/s

B. 1.7 m/s

C. 5.1 m/s

D. 6.3 m/s

The separation between the objective and the eyepiece should be -7.368 cm to get the desired magnification of 30.

Magnification - For a compound microscope, the magnifying power is given by M = Me × Mo where Me = 1 + (d/fe ), is the magnification due to the eyepiece and Mo is the magnification produced by the objective.

According to the given information : fe = 3.5 cm ; fo = 2.0 cm ;

d = 25 cm (d = The normal distance of clear vision of the human eye) and M = 30

Let L be the distance between the objective and the eyepiece.

M = -L/fo (1 + d/fe)

30 = -L/2.0 cm (1 + 25 cm/3.5 cm)

L = -7.368 cm

The separation between the objective and the eyepiece should be -7.368 cm to get the desired magnification of 30.

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When [tex]x=0.33A[/tex] the system's potential energy is 1/9 of the total mechanical energy.

Explanation:

In a simple harmonic motion the mechanical energy is conserved and is expressed by the relation

      Em = ½ k A²

At all points of movement the mechanical energy and

      Em = K + U

remember that potential energy is

      U = ½ k x²

they ask us for the point where

       U = 1/9 Em

 we substitute

      ½ k x² = 1/9 (½ k A²)

      x = √1/9     A

      x = 0.33 A

Energy may take on a variety of shapes. Examples of these include: electrical energy, sound energy, chemical energy, nuclear or atomic energy, light energy, heat energy, mechanical energy, gravitational energy, and so on. Each form has the ability to shift or transform into the others.

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The mechanical advantage of the lever is 4.8

Mechanical advantage is a measure of the ratio of output force (load) to input force (effort applied) in a system, used to analyze the forces in simple machines like levers and pulleys. Changing the forces that are applied, the conservation of energy is still true and the output energy is still equal to the input energy.Mechanical advantage has no unit.

Therefore mechanical advantage is given as Load/Effort

In this case the load is 120N and the effort is 25N

Therefore the mechanical advantage of the lever = 120/25= 4.8N

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Solar activity includes coronal mass ejections, high-speed solar winds, solar energetic particles, and solar flares.

The magnetic fields become tangled, stretched, and twisted due to the Sun's perpetual gas movement. Solar activity, or solar activity as it is also known, is produced by this motion on the Sun's surface. The Sun's surface occasionally exhibits intense activity. The atmosphere can change from time to time.

In actuality, the lengthier, 22-year cycle of solar activity is divided in half by the 11-year sunspot cycle. The magnetic field of the Sun associated with sunspots reverses polarity with each upswing and downswing in the number of sunspots, and the northern and southern magnetic hemispheres of the Sun alternate in their orientation. There is an 11-year cycle between solar activity maxima as determined by the quantity of sunspots.

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The maximum value of the car’s velocity in order to prevent the car from skidding off the road is (urg)^(1/2)

The displacement that an object or particle experiences with respect to time is expressed vectorially as velocity. The meter per second (m/s) is the accepted unit of velocity magnitude (also known as speed).

The direction of a body or object's movement is defined by its velocity. In its basic form, speed is a scalar quantity. In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate.

The pace at which an object's position changes in relation to a frame of reference is known as its velocity, and it depends on time. The definition of velocity is the specification of a moving object's speed and direction (for example, 60 km/h to the north).

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The meterstick has a mass of 0.40 kg and is suspended from a string that is knotted at the 11-cm point. A 0.40-kg object is suspended from the meterstick's zero end due to its uniform density.

Mass is a physical body's total amount of matter. It also serves as a gauge for the body's inertia, or resistance to acceleration (change in velocity) in the presence of a net force. The strength of an object's gravitational pull to other bodies is also influenced by its mass. The substance's mass per unit of volume is known as its density (volumetric mass density or specific mass). Although the Latin letter D may also be used, the sign most frequently used for density is (the lower case Greek letter rho). Mass is the mathematical definition of density.

M2 = 0.40 Kg

d =  11cm

m1*g*r1 = m2*g*r1

m1*9.8 = 0.40*9.8

m1 = 0.40 kg

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The primary auditory cortex, which is tonotopically organized, is finally reached by auditory afferents in the insular cortex's Heschel's gyrus.

In addition to being critical for language comprehension, this region is also essential for speech generation, phonological retrieval, and semantic processing. The anatomical foundation of the primary auditory area is provided by Heschl's gyrus, which is a significant part of the posterior STG.

The transverse temporal gyrus, often known as "Heschl's gyrus," which is a part of the primary auditory cortex, is credited to Heschl as being first described by a medical professional. Incoming auditory data is processed by this anatomical structure.

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750 nm is the predicted wavelength. The distance between two successive crests or troughs of a wave is known as its wavelength. It is measured in the wave's direction.

A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles. This length is typically defined in wireless systems in meters (m), centimeters (cm), or millimeters (mm) (mm).

= slit separation = 1.8 mm = 0.0018 m

is the monochromatic light's wavelength.

= 4.8 meters from the screen

= first bright fringe's position =

= order = 1

The first bright fringe's position is indicated by

λ = 7.5 x 10⁻⁷ m

λ = 750 nm

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17.1 W is the power dissipated in the wire.

Power is the amount of work completed in a given amount of time, or time spent working. The joules per second (J/s)-based SI unit of power is the Watt (W).

In light of the fact that the potential difference is V = 1.5 V.

The wire is l = 1.5 meters long.

The area of the cross-section is A = 0.6m.

The wire has a 5.25 resistance.

R=ρ l/A

=5.25×10^(-8)×1.5/(0.6×10^(-6) )

=0.13125Ω

The formula to calculate power is

P=V^2/R

Substituting the values, the power will be

P = ((1.5)^2)/0.13125

P = 17.1  W

Thus, the power dissipated in the wire is 17.1 W

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Speed of private jet:200 mph. Speed of commercial jet:400 mph

The private plane traveled at 200 mph, whereas the commercial flight did it at 400 mph.

The commercial jet covers the same distance in six hours that the private jet does in ten.

Commercial jets go roughly 200 mph less than private jets, which travel at three times the speed.

Now, if we suppose that the private jet's speed is X mph, the commercial jet's speed will be (3 X - 200) mph.

For the private jet, if the distance covered is D,

D = 10X

For commercial aircraft,

D = (3X-200)

6

Now, we can write,

10X = 18X - 1200

6X = 1200

X = 200 mph.

Thus, the commercial jet's speed was 400 mph while the private jet's speed was 200 mph.

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The heat absorbed by the ice during changing its phase from a solid-state to the liquid state is called the latent heat. Heat capacity is the amount of heat energy required to raise the temperature of a given quantity of matter by one degree Celsius.

How will the latent heat be obtained when ice undergoes transition?

The ice would have to undergo 2 phase transitions and absorb heat in the 3 phases. The equation would be:

Q=mC(ice) ∆T(ice) +mHf+ mC(water) ∆T(water) +mHv +mC(steam)∆T(steam)

The latent heat of fusion Hf of water is 333.55 J/g

The latent heat of vaporization Hv of water is 2257 J/g

The heat capacity C(water)  of water is 4.184 J/g-C

ΔT(ice)  is from -20 to 0 degrees Celsius

ΔT(water) from 0 to 100 degrees Celsius, and

ΔT(steam)from 100 to 125 degree celcius

Q=10.0×2.09×(0−−20)+10.0×333.55+10.0×4.184×(100−0)+10.0×2257+10.0×1.84×(125−100)Q=10.0×2.09×(0−−20)+10.0×333.55+10.0×4.184×(100−0)+10.0×2257+10.0×1.84×(125−100)

Therefore, main answer is that Heat Capacity is Q=30967.5 J=30.9675 kJ

It requires 31.0 kJ of heat to warm the ice initially at -20.0 ∘C, to steam at 125∘C.

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The statement leads us to the conclusion that 7.07kJ of heat are needed to warm the ice.

An object's heat is made up all of the potential of all intrinsic molecular motion. Temperature is a unit of measurement for the heat produced of typical energy of an object, such as the parts of a material.

Given data:

Ice has a mass of 15.0 grams (m).

The starting temperature is 10 degrees Celsius below zero.

T' = 110.0 degrees Celsius, which is the final temperature.

Ice has a heat capacity of c = 2.09 J/g C.

Steam has a heat capacity of c' = 2.01 J/g C.

At 110 degrees Celsius, the transformation from freezing to water (a liquid) and then to steam occurs as ice absorbs heat. So,

This is how much heat was absorbed:

Q = m[c(T' - T) + c'T']

Q = 15[2.09(110-(-10)+(2.01*110)]

Q = 7078.5 J

Convert in kJ as,

Q = 7078.5/1000

Q = 7.07 kJ

Therefore, we may say that 7.07kJ of heat are needed to warm the ice.

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The complete question is-

How much heat (in kJ) is required to warm 15.0 g of ice, initially at −10.0 °C, to steam at 110.0 °C? The heat capacity of ice is 2.09 J/g · °C, and that of steam is 2.01 J/g °C.

The electron's K.E. is P 2 /2m=2.4151019 J=1.51 eV. The relationship between the system's energy output and input is referred to as the "energy balance," "energy payback ratio," or "energy ratio."

The balance of energy can be written as. Eo = dE plus Ei. The energy returned by the material to the energy taken in from the environment is known as the yield ratio. Only the primary fuel can speed up growth, but their availability is constrained.

The De Broglie hypothesis states that p= h \s​

= \s1∗10 \s−9

6.62∗10 \s−34

​ \s =6.62∗10 \s−25 \s kg−m/s

No matter if it's an electron or a photon, the value is constant.

(b) λ=1 nm

E = hc / e = 1243.1 eV = 1.24 keV

Momentum, p=h/=6.631025 kgm/s, is shown in (c).

The electron's K.E. is P 2 /2m=2.4151019 J=1.51 eV.

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A chemical reaction took place absorbing thermal energy from the pack

Ligaments, which are tenacious bands of fibrous tissue that hold two bones together in your joints, can be stretched or torn during a sprain. An ankle sprain is the most typical type of injury. The first course of treatment entails rest, ice, compression, and elevation.

A direct or indirect injury (trauma) that misaligns the joint, overextends it, and occasionally tears the supporting ligaments results in a sprain. A sprain can result from various injuries, for instance: rolling your ankle while running, switching directions, or coming down from a jump

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In each trial the material and hence the index of refraction in the region between the barrier and the screen is 487.8 nm

Given D=2.05,d=5

m=1,Y1=20cm

we have d sinθ = mλ

λ=dYn/mD=

5*10⁻⁶*20*10⁻²/1*2.05

λ=487.8 nm

In physics, refraction is the direction change brought on by a wave's speed change as it passes through one medium and enters another. In deep water, for instance, waves move more quickly than in shallow water. When two materials with different densities, such as air and glass, are in contact, light waves change their speed. Refraction is the term for the resultant change in direction that results.

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3.325m/s^2 acceleration will you give to a 24.9 kg box if you push it horizontally with a net force of 82.8 N.

What is Newton's second law?

Following Galileo, Isaac Newton investigated the motion of various substances and came up with his three famous laws, the first of which defines force and the second of which analyzes it. When an object's mass is constant under certain circumstances, the force is theoretically equal to the sum of the body's mass and the acceleration it experiences.

Data Given

- Mass of the box[tex]$m=24.9 \mathrm{~kg}$[/tex]

- Net horizontal force on the box[tex]$F=82.8 \mathrm{~N}$[/tex]

As per Newton's second law

[tex]$$\begin{aligned}& F=m a \\& a=\frac{F}{m} \\& a=\frac{82.8 \mathrm{~N}}{24.9 \mathrm{~kg}} \\& a=3.325 \mathrm{~m} / \mathrm{s}^2\end{aligned}$$[/tex]

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The temperature of the junction H2 is and the heat currents flowing in these three rods is H1 = 2KA/3L (Ti - To).

The thermal conductivity of a fabric is a degree of its capability to behavior warmth. it's miles usually denoted by k, lambda, or kappa. warmth switch occurs at a decrease rate in materials of low thermal conductivity than in materials of excessive thermal conductivity.

Calculation:-

H2 = H1/2

K A ( T initial - T final)/L

= 2KA ( T i T f)/L

T = (T1 + 2To)/3

H1 = 2KA/3L (Ti - To)

By symetry and law of comservation of energy.

H1 + H2 + H3 = O

H1 = H2 + H3

H2 = H3. (same properties)

H1/2 = H2 + H3

Rod 1

H1 = K(T i - T j)/L

Rod2

H2 = KA(T j - T o )/L

Thermal conductivity is a belongings that describes how properly warmness flows thru a substance. The better the thermal conductivity, the higher a substance conducts warmness.

The lower the thermal conductivity the higher, because the material conducts much less heat strength. Thermal conductivity is a assets of the cloth and does not consider thickness. Different thicknesses of the identical fabric nevertheless have the identical λ-fee.

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Beginning with the examination of the sound's pitch, location, and volume, the temporal lobes become aware of the sound.

The process of closely scrutinizing something to learn more about it or form an opinion about it as a result of doing so: The performance of the investment plan was examined independently by our financial specialists. Clare's evaluation of the circumstance piqued my curiosity.

The process of organizing and analyzing experimental data in physics is done to support a theory or hypothesis. It is a crucial step in the scientific process and calls for students to show high levels of proficiency in critical scientific abilities.

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The gases in the cell is under 8333.3 Pa of pressure.

Pressure is the term used to describe the physical force exerted on an object. Per unit area, a perpendicular force is delivered to that same surface of the objects. F/A is the primary formula for tension . Pascals are a unit of pressure (Pa). Relative, atmospheric, disparity, and gauge pressures are various types of pressure.

Briefing:

By using the first law of thermodynamics, we can find the work done by the gas:

ΔU = Q -W

where in this problem:

ΔU = 530kJ  is the change in internal energy of the gas

 Q = 830KJ is the heat absorbed by the gas

W is the work done by the gas (positive if done by the gas, negative otherwise)

Therefore, solving for W,

W = Q - ΔU

   =  830 - 530

   =  300KJ

   =  [tex]3.00 .10^{5}[/tex] J

So, the gas has done positive work: it means it is expanding.

Then we can rewrite the work done by the gas as

[tex]W = p(V_{f} -V_{i} )[/tex]

where:

[tex]V_{i} = 52 m^{3}[/tex] is the initial volume of the gas

[tex]V_{f} = 88 m^{3}[/tex] is the final volume

P is the pressure

And solving for P, we find

[tex]V_{f} = V_{i} + \frac{W}{P}[/tex]

[tex]88 = 52 + \frac{3.00.10^{5} }{P}[/tex]

[tex]88-52 = \frac{3.00.10^{5} }{P}[/tex]

[tex]36 = \frac{3.00.10^{5} }{P}[/tex]

[tex]P = \frac{3.00.10^{5} }{36}[/tex]

[tex]P = 8333.3 Pa[/tex]

Therefore , the pressure of the gas is 8333.3 Pa

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The yellow red stain that occurs on some rock surfaces is the result of Oxidation Form of weathering

A molecule, atom, or ion undergoes oxidation when it loses electrons as a result of a process.

When a molecule, atom, or ion's oxidation state is raised, oxidation takes place. When there is an increase in electrons or a drop in an atom, molecule, or ion's oxidation state, the process is known as reduction.

According to the given information

When you see crimson stains on rock, you are looking at the results of oxidation, which is when oxygen causes chemical changes. Steel and other iron-containing materials oxidise, which sets off a chemical reaction that causes the material to rust. Similar chemical weathering occurs in rocks.

The yellow red stain that occurs on some rock surfaces is the result of Oxidation Form of weathering

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The nuclear equation for Uranium-235 decays into thorium-231 is as follows:

²³⁵U₉₂ → ²³¹Th₉₀ + ⁴He₂

Helium also known as alpha particle is been emitted during the decay.

Radioactive decay is the release of energy in the form of ionizing radiation. Because ionizing radiation can affect the atoms of living organisms, it poses health risks by damaging genetic tissue and DNA. Emitted ionizing radiation may contain alpha particles. Atoms decay radioactively if there is a low-energy nuclear configuration available for transition. The actual decay events of single atoms occur randomly and are not the result of the atom's age or aging. Some known radioactive decay is:

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The rate constant for the nuclide is 0.38.

We know that the rate of first order reaction is given by : [tex]kt = 2.303*log(R'/R)[/tex]

where k = rate of reaction

           t = time = 3.4 days

           R' = initial amount = 45 g

           R = final amount = 12.1 g

Putting these values in above reaction we get k = 0.38

i.e. the rate constant for the nuclide is 0.38.

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A garden hose with a small puncture is stretched horizontally along the ground. The hose is attached to an open water faucet at one end and a closed nozzle at the other end.

Height up to which water squirts vertically out of the puncture is, h2 = 0.73 m

Let A be the area of the cross-section of the hose.

From Bernoulli's equation, we can write,

[tex]P1 + (1/2) \rho v12 + \rhogh1 = P2 + (1/2) \rho v22 + \rhogh2[/tex]

we assume that the area of the cross-section of the hose is equal to the area of the puncture so that the velocity of the water both inside the hose and at the puncture is the same. Since the hose is on the ground, h1 = 0 m. Also, P2 = 0 as water in the open experiences no pressure.

Thus, we can write

[tex]P1 = PGH_{2}[/tex]

where [tex]Pgh_{2}[/tex]is the potential energy per unit volume?

[tex]\rho = 1000 kg/m3and g = 9.8 m/s2[/tex]

So,

P1 = 1000 kg/m3 * 9.8 m/s2 * 0.73 m

[tex]P1 = 7154 kg/m.s2\approx 7kPa[/tex]  is the pressure inside the hose.

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The ideals that we place Our time is equivalent to 20 seconds since S is 400 meters and an is four meters per second squared.

Car's acceleration was gradual. To move through the grades more quickly than is typical: to follow a sped-up educational curriculum. The rate of change has accelerated in recent months.

Any alteration in an object's velocity might take the form of a change in direction of motion or a speed increase or reduction. The moon orbiting the earth, an apple falling to the ground, and a car stalled at a stop sign are a few instances of acceleration.

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The average power increases by a factor of 3^2 = 9 since is proportional to the square of the rms voltage.

What is rms voltage?

In the AC waveform tutorial, we briefly looked at the RMS voltage value of a sine wave and said that this RMS value would give the same heating effect as the equivalent DC power. We detail them in terms of RMS voltage and current.

The term 'RMS' stands for 'Root Mean Square'. Most books define this as "the amount of AC power that produces the same heating effect as equivalent DC power" or something along those lines, but the RMS value is much more than that. Mean value of the quadratic function of instantaneous values. The symbols used to define RMS values ​​are VRMS or IRMS.

Therefore, the average power increases by a factor of 3^2 = 9 since is proportional to the square of the rms voltage.

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the average power input to the wheel during this time interval, power  P = I ω f  2 /2 T

What is average power?

It is the average amount of work done or energy converted per unit of time. The average power is often simply called "power" when the context makes it clear. The instantaneous power is then the limiting value of the average power as the time interval Δt approaches zero.

Power  P = torque * average angular speed

             = I α ( 0 + ω f ) / 2

where  I = moment of inertia

         α= angular accleration = ω f / T

So, power P = I ω f  2 /2 T

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The distance from the wall is 17 m when a bat flying in a cave emits a sound and receives its echo 0.1 s later.

Given sound wave velocity (s) = 340m/s

Time taken for the sound wave (echo) to travel towards the wall and reflect off the bat = 0.1 s

So the time taken by the sound wave to travel to the wall only (t) = 0.1s/2 = 0.05s

Distance from wall to bat (d) = speed of sound wave(s) * time(t)

The distance between the wall and the bat is = 340 m/s * 0.05 s = 17 m

Thus, the distance from the wall when a bat emits a sound and receives its echo 0.1 s later in a cave is 17 m.

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The projectile hit the ground 3,992.97 m in front of the release point.  The projectile speed when it hits the ground is 438.5 m/s

When a level-flying aircraft fires a projectile horizontally in the direction of travel, it means:

v₁ = speed of the plane = 500 km/h

v₁ =500 x 1000 km = 138.89 m/s

                3600s

v₂ = velocity of bullet with respect to plane = 290 m/s

v = projectile velocity relative to the ground

v = v₁ + v₂ = 428.89 m/s

The projectile moves horizontally, but has projectile motion that moves horizontally and vertically along a parabola curve.

In the vertical direction, the projectile moves with un uniform motion.

uy = initial vertical velocity = 0 m/s

h = height = 850m

g = gravitational acceleration = 9.8 m/s²

2h = 1/2 gt²

2 × 850 = 9.8 × t²

t = √1,7009.8

t = 9.31 seconds

The projectile moves horizontally with constant velocity.

distance

d = vt

d = 428.89 × 9.31

d = 3,992.97m

when the projectile almost touches the ground

vertically

maximum speed

vy = gt = 9.8 × 9.31 = 91.24 m/s

horizontally

vx = v = 428.89 m/s

projectile final velocity

v² = vx² + vy²

v² = 428.89² + 91.24²

v² = 183,946.63 + 8,324.37

v² = 192,271.004

v = 438.5 m/s

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The maximum magnetic field strength is 6.22 × 10⁻⁴ T. The result is obtained by dividing the maximum electric field strength by the speed of the wave.

The ratio of electric field strength to magnetic field strength in any electromagnetic wave is equal to the speed of light.

E/B = c

Where

If the speed of the medium wave is 0.75c and the maximum electric field strength is 140 kV/m. The maximum electric field strength would be

B = E/0.75c

B = 140.000/0.75c

B = 140.000/(0.75 × 3 × 10⁸)

B = 14×10⁻⁴/2.25

B = 6.22 × 10⁻⁴ T

Hence, the maximum electric field strength in the electromagnetic wave is 6.22 × 10⁻⁴ T.

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The pressure reading of the pitot tube is 12.0 mm hg at a speed of at 830 km/h will be 187.45 mm of Hg.

It is given that,

The pressure reading of the pitot tube =12 mm of Hg

[tex]$\mathbf{p}_1=12 \mathrm{~mm}$[/tex] of Hg

Velocity at this height [tex]$\mathrm{v}_1=210 \mathrm{~km} / \mathrm{h}$[/tex]

Pressure reading at height [tex]$\mathrm{h}_2=$[/tex]

Velocity at this height [tex]$\mathrm{v}_2=830 \mathrm{~km} / \mathrm{hr}$[/tex]

Now applying the concept of the Bernoulli principle

[tex]$$\mathrm{p}_1+\frac{1}{2} \rho \mathrm{v}_1^2+\rho \mathrm{gh}_1=\mathrm{p}_2+\frac{1}{2} \rho \mathrm{v}_2^2+\rho \mathrm{gh}_2$$[/tex]

From the above equation it is clear that

[tex]$$\begin{aligned}\Delta \mathrm{p}_1^2 & =\frac{1}{2} \rho \mathrm{v}_1^2 \\\Delta \mathrm{p}_2 & =\frac{1}{2} \rho \mathrm{v}_2^2 \\\frac{\Delta \mathrm{p}_2}{\Delta \mathrm{p}_1} & =\frac{\frac{1}{2} \rho \mathrm{v}_2^2}{\frac{1}{2} \mu \mathrm{v}_1^2} \\\frac{\mathrm{p}_2}{\mathrm{p}_1} & =\frac{\mathrm{v}_2^2}{\mathrm{v}_1^2}\end{aligned}$$[/tex]

Hence, the value of the Pressure is given in terms of mm of Hg will be:

[tex]$$\begin{aligned}& \frac{\mathrm{h}_2}{\mathrm{~h}_1}=\frac{\mathrm{v}_2^2}{\mathrm{v}_1^2} \\& \mathrm{~h}_2=\mathrm{h}_1\left(\frac{\mathrm{v}_2^2}{\mathrm{v}_1^2}\right) \\& \mathrm{h}_2=\frac{12(830)^2}{210^2}=187.45 \mathrm{~mm} \text { of } \mathrm{hg}\end{aligned}$$[/tex]

For such more questions on Bernoulli principle

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