Ultrasound in Medicine. A 1.70-MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward the sound receiver as the heart beats. The reflected sound is then mixed with the transmitted sound, and 72 beats per second are detected. The speed of sound in body tissue is 1500 m/s. Calculate the speed of the fetal heart wall at the instant this measurement is made.

A constant acceleration for an object guarantees that its velocity will change continuously throughout time and not remain constant.

Similarities.Acceleration and velocity are both vector quantities, meaning they have both a magnitude and a direction.Both expressions are capable of being zero, positive, or both.

The rate at which in displacement is known as velocity.The rate at which velocity changes is called acceleration.Due to the fact that it includes both magnitude and direction, velocity is an vector quantity.As the rate at which velocity changes, acceleration is likewise a vector quantity.

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1. Filter absorbs all colors of white light.

2. The light that has passed through a filter, is always dim.

The filter selectively transmits the red and blue portions of the incident white light spectrum, but absorbs most of the green wavelength.

Color filters absorb certain wavelengths of color and transmit the other wavelengths allowing them to be seen.

Therefore in conclusion, the right filter can reduce glare, increase contrast, and make lunar features pop.

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The binding stress of the spear gear in the table is 502.22 Pa.

The diameter of the pinion is equal to:

d(p) = Nm(p)

Where

m = module = 5

Np = number of teeth of pinion = 26

d(p) = 5* 26 = 130 = 0.13 m

The pitch line velocity is equal to:

v(t) = d(p)*2pi*w(p)/120

Where

wp = speed of the pinion = 1800 rpm

v(t) = 12.25 /s

The factor B is equal to: 0.396

The factor A is equal to:

A = 50 + 56*(1 - B) = 50 + 56*(1-0.396) = 83.82

The dynamic factor is:

K(v) = A/A+√200v(t) B

K(v)= 0.832

The geometry bending factor at 20°, the application factor Ka, load distribution factor Km, the size factor Ks, the rim thickness factor Kb and Ki the idler factor can be obtained from tables

JR = 0.41

Ka = 1

Kb = 1

Ks = 1

Ki = 1.42

Km = 1.7

The diametrical pitch is equal to:

p(d) = 1/m = 1/5 = 0.2

The bending stress is equal to:

σ = w(t)p(d)k(a)k(m)k(g)k(b)k(i)/FJ(g)K(v)

σ = 502.22 Pa

Therefore, the binding stress of the spear gear in the table is 502.22 Pa.

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Solstices happen when the axis of the Earth is towards our Sun.

what is nourthern hemisphere ?

The portion of the planet north of the equator is known as the northern hemisphere. Other planets in the Solar System are considered to be in the same celestial hemisphere as Earth's North Pole when seen in relation to the solar system's invariable plane.

The Northern Hemisphere experiences winter from the December solstice (usually December 21 UTC) to the March equinox (generally March 20 UTC), and summer from the June solstice through to the September equinox due to the Earth's axial tilt of 23.439281°. (typically on 23 September UTC). The distinction between the astronomical year and the calendar year causes the dates to change every year. Oceanic currents in the Northern Hemisphere can alter weather patterns that have a significant impact on many northern variables.

Solstices happen when the axis of the Earth is towards our Sun. This occurs twice a year when the Earth is in orbit. The summer solstice, the longest day of the northern hemisphere year, occurs around June 21 when the north pole is angled 23.5 degrees toward our Sun.

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Answer:

Explanation:

A leaf appears green becuase of photosyithesis

Milk appears white because all the corols are being aborseb

words on the page are black because all colors are being refcted.

A monochromatic light source with a power output of 59.0W radiates light of wavelength 600nm uniformly in all directions.

A. B(max) = 3.89 × 10⁻⁸ T

B. E(max) = 11.67 N/C

Single-wavelength light sources are known as monochromatic lights, where mono stands for only one and chroma for color. Monochromatic lights are defined as visible light that falls within a certain range of wavelengths. It has a wavelength that falls within a constrained wavelength range.

The whole spectrum is theoretically included in each higher-order maximum, but because of potential partial overlap with the next-order maximum, it can be challenging to identify the pattern for a given color. Monochromatic lighting solves this issue.

The intensity of the wave is calculated as:

I = P/A

or, I = P/4πR²

or, I = 59.0 W/ 4π(5.10m)²

or, I = 0.1805 W/m²

A. Emax for the light at a distance of 5.10m from the source.

E(max) = [tex]\sqrt{2u_0cI}[/tex]

or, E(max) = 11.67 N/C

Where, [tex]u_0[/tex] = 4π × 10⁻⁷ T.m/A

c = 3 × 10⁸ m/sec

I = 0.1805 W/m²

B. The amplitude of the magnetic field is calculated as follows:

B(max) = E(max)/c

or, B(max) =  (11.67 N/C) / (3 × 10⁸ m/sec)

or, B(max) = 3.89 × 10⁻⁸ T

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As a result, the wall is 17 m away when a bat flying through a cave makes a sound and then hears its echo 0.1 seconds later.

Distance of the wall from the bat (d) = speed of sound wave (s) x time (1)

Putting the values and we get;

Distance of the wall from the bat (d)=340 ms x 0.05 s = 17 m

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

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An object is thrown vertically up in the air. Its initial velocity is 6 m/s. The object's maximum height is 1.83673 m.

Projectile motion can be regarded as a form of motion that can be  experienced by an object when its been projected near the Earth's surface and follows curved path under the action of gravity only.

Given, the velocity of ball, u= 6 m/s

Here, v be the final velocity, u be the initial velocity and H be the height.

Velocity of the ball at maximum height is zero, v=0

v² - u² =2aH                          

0−(6)²=2×(−9.8)×H        

⟹H= 1.83673 m              

Thus, the object's maximum height is 1.83673 m.

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The work that is done by the gas can be obtained as 110 J.

There is not enough information in the question to determine part B.

We know that a gas is said to do work whenever the gas expands. The expansion of a gas mans that the gas is able to increase its volume and we can see from the question that the volume of the gas was quite able to move from a value of  450 mL to 810 mL .

How then can be be able to obtain the work that has been done by the gas in this case? We are aware that we do have the following parameters from the question;

Pressure of the gas = 3.1 atm

Initial volume of the gas = 450 mL or 0.45 L

Final volume of the gas = 810 mL or 0.81 L

The we have the formula;

W =PΔV

W = work done

P = pressure of the gas

ΔV = change in the volume of the gas

Thus;

W = 3.1 (0.81 - 0.45)

W = 1.12 atm L or 110 J

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Time period of the pendulum, T = 19.7 s

The time period of the pendulum is given by :

T = [tex]2\pi \sqrt{\frac{l}{g} }[/tex], l is the length of the pendulum

substituting,

l = 174.32 meters

What is the time period?

Time period (plural time periods) is the amount of time that a behavior lasts or a condition persists. Depending on the type of activity or situation under consideration, it may be measured in seconds or in millions of years.

Hence, the answer is 174.32 m

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Answer:

d) temperature

Explanation:

Answer:

D) temperature

Explanation:

Temperature is a measure, an actual measurable number of the average kinetic energy of the particles of one substance.

Answer:1/64. im glad i could at least try to help lol im in middle school and i just ran through a bunch of articles 4 u

At the end of 20 ns, the electron's velocity will be approximately 5.2 × 10⁶ m/s.

The force per unit charge exerted on a positive test charge that is at rest at a given position is the force per unit charge that is used to define the electric field analytically.

Electric charge or magnetic fields with variable amplitudes can produce an electric field. The attraction forces that keep together atomic nuclei and electrons at the atomic scale are brought on by the electric field.

Given that:

the electric field is 1.25 kN/C

So, acceleration of the electron: a = eE/m

= (1.6 × 10⁻¹⁹×1.25×10³)/(9.1×10⁻³¹) m/s²

= 2.6 × 10¹⁴  m/s².

Hence, after  the end of 20 ns the electron's velocity will be = at

= 2.6 × 10¹⁴ × 20 × 10⁻⁹ second

= 5.2 × 10⁶ m/s.

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The correct statement about the given two object when placed in a container is b)Object B has a greater density than object T. So, correct option is b.

At the point when an item stay balance while lowered, its gravity should be equivalent to the lightness force, which is equivalent to the fluid weight dislodged by the lowered volume:

[tex]V_s[/tex]ρ[tex]_l[/tex]g=mg=Vρ₀g

=>[tex]V_s[/tex]ρ[tex]_l[/tex]=Vρ₀

=>ρ₀=([tex]V_s[/tex]ρ[tex]_l[/tex])/V

where ρ₀,ρ[tex]_l[/tex]  are densities of the object and liquid, separately. are the volume lowered and the item volume, separately.

In the event that object B is completely lowered, the thickness of article B is equivalent to the fluid thickness (on the grounds that ).

With respect to protest T as it's just to some extent lowered, the mass of the fluid dislodged is same as mass of article. And keeping in mind that the volume uprooted is just a piece of the entire item volume (), this implies that the fluid thickness is more noteworthy than object T's thickness.

Hence, correct option is b.

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(Complete question) is:

Two objects, T and B, have identical size and shape and have uniform density. They are carefully placed in a container filled with a liquid. Both objects float in equilibrium. Less of object T is submerged than of object B, which floats, fully submerged, closer to the bottom of the container. Which of the following statements is true?

a. Object T has a greater density than object B.

b. Object B has a greater density than object T.

c. Both objects have the same density

Energy is transferred by a sound wave between particles, when sound waves get closer then frequency of wave is high.

Pulses caused by brief disturbances of the medium Wavepackets: like harmonic waves, but with finite extent. We usually focus on harmonic waves that extend forever. They are useful because they have simple math, and accurately describe a lot of wave behavior.

A harmonic wave moving in the positive x direction can be described by the equation y(x,t) = A cos(kx - wt).

Sound waves or electromagnetic waves that are created from a point source are spherical waves, i.e., they move radially from the source in all directions. These waves can be represented by circular arcs. These arcs are surfaces of constant phase (e.g., crests)

In general for spherical waves the intensity will fall off as 1/r2 i.e., the amplitude falls off as 1/r. We have all sorts of waveforms, but thanks to superposition, if we find a nice simple set of solutions, easy to analyze, we can write the more complicated solutions as superpositions of the simple ones.

It is a mathematical fact that any reasonable waveform can be represented as a superposition of harmonic waves. This is Fourier analysis, which many of you will learn for other applications.

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The matter in this series of images is going through a change and a conclusion about the type of change is shown which indicates that it is a chemical change.

This is referred to as the type of change which occurs when the substance's composition is changed and it also occurs when a substance combines with another to form a new substance or when one is broken down into two or more different substances.

The image shown indicates that fire was lit and the substance was subjected to heat which therefore means that there will be gases produced as bubbles are likely to be seen also which indicates a new substance being formed and it is a characteristic of a chemical change which is therefore the reason why it was chosen as the correct choice.

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At the dew point, air can no longer absorb water vapor. When air cools above its dew point, water vapor becomes a liquid. This is a physical process known as condensation.

While you breathe out (exhale), your lungs put carbon dioxide again into the air. but, the breath you exhale doesn't only contain carbon dioxide. It additionally includes moisture from your mouth and lungs. This moisture is inside the form of water vapor, the gasoline shape of water.

While you exhale on a chilly day, the air that goes out is saturated and the temperature of the air you exhale is warmer than the encompassing air.

The water vapor to your breath condenses into many tiny droplets of liquid water and ice that you could see within the air as a cloud. It seems pretty similar to fog.

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If you hear an echo 0.15 seconds after banging, the barn is 25.725 m long.

An echo is a sound that results from the return of sound waves to the listener from a surface. It is the reflection of sound, which reaches the listener after the direct sound has passed.

Given data:

you hear an echo 0.15 seconds after banging.

we know that speed of sound in air is 343 m/s.

As in this time sound waves goes to the barn and returns back.

Hence, the barn is = 343×0.15/2 m long = 25.725 meter long.

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Because whilst depth of incident mild will increase, it approach that wide variety of photons will increase in incident mild.

If wide variety of incident photons will increase, then wide variety of emitted picture graph electrons additionally will increase, therefore the picture graph electric powered contemporary will increase.

The photoelectric impact. In the photoelectric impact, mild waves (pink wavy lines) hitting a steel floor motive electrons to be ejected from the steel.

Current in picture graph electric powered impact is immediately proportional to the depth of the incident mild. paintings function, preventing potential, most kinetic electricity are unbiased of depth of incident mild, they rely upon the frequency, wavelength of the incident mild and cloth of the steel.

Using L for luminosity, the depth of mild system becomes I=LA I = L A . Because mild waves unfold in all directions, to correctly calculate mild depth, the denominator withinside the system have to be the floor vicinity of a sphere. In fact, maximum electromagnetic calculations are achieved over a sphere.

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Answer:

889.2 J

Explanation:

F = ma = (12 kg)(3.9 m/s²) = 46.8 N

W = Fd = (46.8 N)(19 m) = 889.2 J

If the rodent oscillates at a frequency of 0.950 kg/s, the motion will be critically dampened at a value of 1.732 kg/s for constant b. to highlight how different from angular frequency ordinary frequency is.

The frequency of an event is its repetitions per unit of time. When contrasting it with spatial frequency, it is also sometimes referred to as temporal frequency.

given damping force: mass = 0.3 kg, k = 2.5 N/m Fx=-bvx+b = 0.950 kg/s

This oscillator is underdamped since the equation of motion for it is mx" + bx' + kx = 0, which results in b2 - 4mk = 0. W = square root(k/m - b2/4m2) yields the angular frequency of oscillation.

For critically damped motion, b2 = 4mk b = 1.732 kg/s, where w = 2.41379 rad/s.

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The best statement is option A.There is more cold, dense gas in the disk than in the bulge.

Star-forming regions are concentrated in galaxies with high concentrations of the material that stars are made of: gas and dust. These concentrations of gas and dust can be "pushed" to the point where they collapse to form stars, depending on the type of galaxy and the types of gravitational interactions it may encounter. Gravity pushes gas and dust to form stars more efficiently in spiral arms than in other parts of the spiral galaxy. This is why spiral arms have more star-forming regions and collections of young stars (open clusters) than other parts of a spiral galaxy.

Thus, due to heavy gravity, gas are more cold and dense in the disk.

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Answer: 31.1 m/s²

Explanation:

avg. accel. = (Vfinal - Vinitial) / Δt

Vfinal = 14 m/s

Vinitial = 0 m/s

Δt = 0.45 s

avg. accel. = (14 m/s - 0 m/s)/0.45 s = 31.1 m/s²

The magnitude of the magnetic field at the center of the loop is 3.31 x 10⁻⁶ T.

The magnetic field is the region of space around which the influence an magnetic force is felt.

Mathematically, the formula for magnetic field at the center of a loop is given as;

B = μ₀I / 2r

where;

The magnitude of the magnetic field at the center of the loop is calculated as;

B = ( 4π x 10⁻⁷ x 0.58 ) / ( 2 x 0.11 )

B = 3.31 x 10⁻⁶ T

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A basketball player shoots a basketball at 5.98 m/s at a 56.7° angle. If the goal is 7.24 m away, 2.205 sec time does the ball take to reach the horizontal position of the goal.

The same as for speed, "m/s" is the SI unit for velocity. While velocity is the rate at which a body's displacement changes, speed is the rate at which a body's distance travelled changes. While velocity is a vector quantity and requires both magnitude and direction to be described, speed is a directionless quantity.

As an example, consider the speed of a car driving north on a highway or the speed of a rocket after launch.

Given that,

initial speed (u) = 5.98 m/s

angle (θ) = 56.7°

distance (R) = 7.24 m

Now, considering motion along horizontally,

R = (u cosθ) × t

or, 7.24 = 5.98 (cos 56.7°) × t

or, t = 2.205 sec

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Answer:

2.21

Explanation:

The partition function of a system of particles is a statistical measure that describes the distribution of particles over different energy states.

It is defined as:

Z = Σexp(-E_i/kT)

where Z is the partition function, E_i is the energy of the i-th particle, k is the Boltzmann constant, and T is the temperature of the system. The sum is taken over all possible energy states of the particles.

In the case of a system of volume v and temperature t consisting of n independent, distinguishable particles, each of which can be in one of two states with energy equal to 0 or e, the partition function can be expressed as:

Z = exp(-0/kT) + exp(-e/kT)

This is because there are two possible energy states for each particle (0 or e), and the partition function is a sum over all possible energy states of the particles.

Substituting the values of k, T, and e into the partition function equation, we can compute the value of Z:

Z = exp(-0/kT) + exp(-e/kT)

= exp(0) + exp(-e/kT)

= 1 + exp(-e/kT)

Thus, the partition function of the system is given by the equation:

Z = 1 + exp(-e/kT)

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(a) The maximum speed of the object is 1.37 m/s.

(b) The locations of the object when its velocity is one-third of the maximum speed is 5.87 cm.

In easy words, speed is the rate at which some thing actions in a specific direction. For instance as the rate of a vehicle journeying north on a highway, or the rate a rocket travels after launching. The scalar method absolutely the cost value of the rate vector is constantly be the rate of the motion.

Velocity is a vector expression of the displacement that an item or particle undergoes with appreciate to time . The preferred unit of speed value (additionally called speed ) is the meter according to second (m/s). Alternatively, the centimeter according to second (cm/s) may be used to specific speed value.

Maximum speed for the object:

[tex]w=\sqrt{ \frac{k}{m}\\\\\\w=\sqrt{ \frac{77.5}{0.215}\\\\\\\\\\\\\w=\sqrt{ 360.46}\\\\\\\\w=18.98[/tex]

Maximum velocity = ωr

v=  18.98*0.0725

v= 1.37.

Maximum velocity = ωr = 1.37.

The speed of the object at a distance x from its mean position is given as:

[tex]v=w\sqrt{a^2- x^{2} } } \\so,\\ v=x\\x=\sqrt[]{8(*7.25} \\x= 5.87[/tex]

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The correct option is b) Observations of the amount of hydrogen in the universe.

What is big bang theory?

The Big Bang Theory is the most popular theory about how the cosmos came into being. Simply expressed, it claims the universe as we know it began with an unimaginably hot and dense single point that expanded and contracted over the course of the following 13.7 billion years, first at incomprehensible speeds and then at a more palpable rate, to the still-expanding cosmos that we know today.

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The shear force V and bending moment M is 0.15 kN and 0.15 kNm respectively.

What is shear force?

A force acting in a direction parallel to (over the top of) a surface or cross section of a body is known as a shear force. It is determined as the algebraic total of all transverse forces operating on either side of a beam or frame section.

What is bending moment?

A bending moment is the reaction in a structural element caused by an external force or moment that causes the element to bend.

In this question,

Moment about A,

[tex]B_y[/tex] * 0.6 = (6 kN/m * 0.3m) * (0.15m)

[tex]B_y[/tex] = 0.45 kN

Force balance along Y direction,

[tex]A_y[/tex] + [tex]B_y[/tex]  = 6 kN/m * 0.3 m = 1.8 kN

[tex]A_y[/tex]  + 0.45 = 1.8

[tex]A_y[/tex]  = 1.35 kN

At a section 200mm (or 0.2m right of A)

V = [tex]A_y[/tex]  - (6*0.2) = 1.35 - 1.2 = 0.15 kN

M = -[[tex]A_y[/tex]  * 0.2] + [6*0.2*(0.2/2)] = 0.27-0.12 = 0.15 kNm

The shear force V and bending moment M is 0.15 kN and 0.15 kNm respectively.

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