Which of the following statements is true about synovial fluid? It contains lactic acid. It is found within the reinforcing ligaments. It contains stem cells. It nourishes the articular cartilage. It has a watery consistency.

Answer:

the molecules form new chemical bonds

Explanation:

The circumstance which will not occur when water undergoes a physical change is that the molecules form new chemical bonds. Thus, the correct option for this question is B.

Physical change may be defined as a type of change within the compound or things that significantly do not change the chemical properties of the matter. It usually involves the process of transition from one state to another.

When water undergoes a physical change means liquid to solid, solid to liquid, or gas, the motion of the molecules, kinetic energy, and density alter with respect to the state of matter. So, all these attributes are classified into the category of physical change.

Therefore, the molecules forming new chemical bonds is the option that will not occur at any point in time when water undergoes a physical change. Thus, the correct option for this question is B.

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Answer:

Research usually is a cyclical process because it starts with a problem and ends with a problem.

This is bad or lessens the value of the research?

No, because there are problems that in nature are cyclical, (for example the related ones to action research).

And it also may be a good thing, solving one "problem" leads to another problem, but in the process of solving the first one we may win a lot of knowledge, and the same happens with the next one, and so on.

Two possible advantages of cyclical research are:

Knowing beforehand that the research will be cyclical, will allow us to estimate better the amount of time and money needed because we already know (more or less) where to aim.

It also may lead to a better end product, as we already know that we must focus in solving one thing and then we can focus in the next one.

Another possible advantage may be that we know that after the work, there will be a new thing to research, and it is fun, so if you are curious enough this may be a good thing (especially in scientific areas, physics, chemistry, etc).

Centripetal refers to “center-seeking” Quantifies the change in directionof the velocity The acceleration is directed toward the center of the circle of motion.

The magnitude of the centripetal acceleration is given by V^2/r, the direction is toward the center of the circle. The tangential component of the acceleration is due to changing speed. The centripetal component of the acceleration is due to changing direction.

When an object is rotating at a constant angular velocity, the whole object has a constant angular velocity. Therefore, every mint on the turntable has the same, constant angular velocity.

The acceleration which causes the tangential velocity to change direction is called Centripetal acceleration. Centripetal acceleration is always in toward the center of the circle.

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Answer: read your text book

Explanation:

Answer:

y = (-1/3)x + 5

Explanation:

the gradient of required equation (m2)

the gradient of given equation (m1) = 3

m1*m2 = -1 ( they are perpendicular)

3*m2 = -1

m2 = -1/3

required equation

y = m2 + c

( 9,2) satisfy the above equation

2 = (-1/3)*9 + c

c = 5

y = (-1/3)x + 5

True

The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0. 250 mw

Intensity of laser beam is 72.3W/m²

Given:

average power output = 0. 250 mw

To Find: intensity of laser beam

First of all, we need to find the area of the circular spot, which is given by:

A = πr^2

where r is the radius of the spot, which is half the diameter, therefore

r = d/2 = 2.10mm/2 = 1.05mm = 1.05 x 10^-3m

So, the area of the spot is

A = π(1.05 10^-3m)^2 = 3.46 10^-6m²

We know that the power output of the laser is

P = 0.250mW = 2.5.10^-4W

So the intensity of the laser beam is

I = P/A = 2.5^-10 W/3.46-10^-6m^2 = 72.3W/m²

So, intensity of laser beam is 72.3W/m²

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Answer:

5.25MJ

Explanation:

Considering the weight of the skydiver constant over the descent -ie, the acceleration of gravity not decreasing as you go up the earth surfice, the work is simply the product of the two:

\(w= \vec F\cdot \vec x = Fx = 1050\times 5000 = 5,250,000 = 5.25MJ\)

Explanation:

uasjwwbwjwbwia GJ wkwkjwnwnwjwjjwjwd7beba s

Hi there!

To solve, we can use a summation of torques.

For the see-saw to balance, the sum of torques must equal 0, so:

∑τ = 0

Recall that:

τ = rFsinθ

r = distance from pivot (meters)

F = force (N)

In this case, the forces are the weight of the children. Also, we can leave the distance in centimeters for this type of problem, but others do require a conversion to meters.

Multiply each mass by 10 (g ≈ 10 m/s²) to get the weight:

Στ = 270(400) - x(300) = 0

270(400) = 300x

Solve for 'x', the distance in cm away from the fulcrum:

108000/300 = 360 cm

Therefore, the speed of the block as it crosses,

(a) The point when the spring is not stretched = 1.93 m / s

(b) 5.00 cm to the left of point in (a) = 1.93 m /s

KE = 1 / 2 m v²

U = 1 / 2 k x²

According to law of conservation of energy,

KEi + Ui = KEf + Uf

k = 100 N / m

m = 0.2 kg

a ) The point when the spring is not stretched,

vi = 0

xi = - 10 cm = - 0.1 m

xf = 0 m

1 / 2 m vi² - 1 / 2 k xi² = 1 / 2 m vf² + 1 / 2 k xf²

0 + ( 1 / 2 * 100 * ( -0.1 )² ) = 1 / 2 * 0.2 * vf² + 0

0.5 = 0.1 vf²

vf² = 5

vf = 2.2 m / s

b ) 5.00 cm to the left of point in (a),

Here, the final values of previous scenario becomes the initial value of this scenario.

xf = - 5 cm = - 0.05 m

xi = 0

vi = 2.2 m / s

1 / 2 m vi² + 1 / 2 k xi² = 1 / 2 m vf² + 1 / 2 k xf²

1 / 2 * 0.2 * 2.2² + 0 = 1 / 2 * 0.2 * vf² + 1 / 2 * 100 * ( -0.05 )²

0.5 = 0.1 vf² + 0.125

vf²  = 0.375 / 0.1

vf = 1.93 m / s

c ) 5.00 cm to the right of point in (a),

The velocity of the block at a distance 0.05 m to left of its equilibrium position, equals its velocity at the same distance to right of its equilibrium position .

vf = 1.93 m / s

Therefore, the speed of the block as it crosses,

(a) The point when the spring is not stretched = 2.2 m / s

(b) 5.00 cm to the left of point in (a) = 1.93 m /s

(c) 5.00 cm to the right of point in (a) = 1.93 m / s

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Answer:

The starting height of the ball is approximately 0.604 m

Explanation:

The given parameters are;

The mass of the the ball = 0.050

The speed with which it travels through the top loop = 2 m/s

The given height at which the ball moves at 2 m/s = 0.40 m

Therefore, we have;

1/2·m·v² = m·g·h

1/2·v² = g·h

h = 1/2·v²/g = 1/2 × 2²/9.81 ≈ 0.204

The additional height = h = 0.204 m

Therefore;

The starting height of the ball  ≈ The given height at which the ball moves at 2 m/s + h

The starting height of the ball  ≈ 0.40 + 0.204 = 0.604 m

The starting height of the ball ≈ 0.604 m.

When any object in rest, then potential energy is present. But when object is in motion then object have kinetic energy.

Starting height of the ball is 0.604 m.

We know that, when any object is start from rest, then potential energy is converted into kinetic energy.

     \(\frac{1}{2}mv^{2} =mgh\)

Where m is mass of object, g is gravitational acceleration , h is height and v is velocity of object. (value of g = 9.81 m/ second square)

from above equation,

we get,     extra height        \(h=\frac{v^{2} }{2g} \\\\h=\frac{4}{2*9.81}\\\\h=0.204\) meter

The starting height of the ball will be sum of the height at which ball moves 2 m/s and extra height.

Starting height = 0.40 + 0.204 = 0.604 meter.

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Answer:All three states of matter (solid, liquid and gas) expand when heated. ... Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

Explanation:well I tried lol she just copied and pasted faster than I could

The statement that is true about the time constant is that the product of the resistance R and the capacitance C is equal to the time constant τ of the charging capacitor.

A time constant describes the rate of change of current or voltage in a circuit. When an RC (resistance-capacitance) circuit is charged, the time constant represents the duration required for the capacitor to charge to 63.2% of its maximum charge potential. It also represents the time required for the capacitor to discharge to 36.8 percent of its maximum potential.

The formula for calculating the time constant of an RC circuit is:τ = RC.

Where R is resistance, and C is capacitance.

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The statement "a star of apparent magnitude +5 looks brighter than one of apparent magnitude +2." is false.

In terms of apparent magnitude, a star with a lower apparent magnitude appears brighter than a star with a higher apparent magnitude. The magnitude scale is logarithmic, meaning that each whole number increase in magnitude represents a decrease in brightness by a factor of approximately 2.5.

So, in this case, a star with an apparent magnitude of +2 would appear brighter than a star with an apparent magnitude of +5. The star with magnitude +2 is approximately 2.5 times brighter than the star with magnitude +5.

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A parallel plate capacitor with circular plates of radius and plate separation is being charged at the rate of Displacement current. Correct answer: letter A.

This is because the plates are parallel and current can flow freely between them. The current flow is perpendicular to the plates, so the charge on the plates is proportional to the area of the plates.

The magnitude of the magnetic field between the capacitor plates at a radius from the axis of the capacitor is zero.

That is, it is determined by the amount of charge on the plates and the distance between the plates. Therefore, the closer the plates are to each other, the greater the magnetic field.

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Constructive interference in performance halls and the elimination of echoes are reasons why choir concerts better in performance halls than in gymnasiums.

Constructive interference is a phenomenon which occurs when two waves travelling in same direction and which are in phase add up together to produce a wave of greater amplitude.

Constructive interference occurs in performance halls while destructive interference occurs in gymnasiums.

Also in performance halls, echoes are minimized due to the padded walls and the curtains while echoes which disturb choir concerts occur in gymnasiums.

Therefore, choir concerts better in performance halls than in gymnasiums because of constructive interference in performance halls and the elimination of echoes.

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Answer:

9.773m/s2

Explanation:

Given,

h=8848m

The value of sea level is 9.08m/s2

So,

Let g′ be the acceleration due to the gravity on the Mount Everest.

g′=g(1−h2h)

=9.8(1−640000017696)

=9.8(1−0.00276)

9.8×0.99724

=9.773m/s2

Thus, the acceleration due to gravity on the top of Mount Everest is =9.773m/s2

Hope it helped!!!

The equivalent resistance between points A and B in the diagram is 22 Ω

We shall begin by obtaining the equivalent resistance in parallel (i,e the three 6 Ω resistor). Details below:

1/Rₜ = 1/R₁ + 1/R₂ + 1/R₃

1/Rₜ = 1/6 + 1/6 + 1/6

1/Rₜ = 3/6

1/Rₜ = 1/2

Rₜ = 2 Ω

Finally, we shall determine the equivalent resistance between A and B (i.e series arrangement). Details below:

R = R₁ + R₂ + R₃ + R₄ + R₅ + R₆ + R₇ + R₈ + R₉ + R₁₀ + R₁₁

R = 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2

R = 22Ω

Thus, we can conclude that the equivalent resistance is 22 Ω

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The student rides the bike at a constant speed.

The appearance of a velocity-time graph depends on the motion being described. However, in general, a velocity-time graph shows how an object's velocity changes over time.

If an object is moving with a constant velocity, the velocity-time graph will be a horizontal line at a constant height, indicating that the object's velocity is constant and not changing over time.

If an object is accelerating, the velocity-time graph will show a non-horizontal line, with the slope of the line indicating the acceleration of the object. A steeper slope indicates a greater acceleration, while a shallower slope indicates a smaller acceleration.

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The magnitude of the force F on the 1.0 nC charge in the figure is the positive charge and force F is 8 x 10^9 N (8 Giga Newtons).

The force F on the 1.0 nC charge in the figure can be calculated using Coulomb's law, which states that the force between two point charges is proportional to the inversely proportional to the square of the distance between the charges and a product of the charges. The magnitude of the force can be calculated using the following formula:

|F| = k x |q1| x |q2| / r^2

where k is the Coulomb constant (9 x 10^9 Nm^2/C^2), q1 and q2 are the charges (in Coulombs), and r is the distance between the charges (in meters).

In this case, q1 = 1.0 nC = 1.0 x 10^-9 C and q2 = -1.0 nC = -1.0 x 10^-9 C (since the charges are opposite and the force is attractive) and r = 0.1 m.

So, the magnitude of the force F can be calculated as:

|F| = k x |q1| x |q2| / r^2 = (9 x 10^9 Nm^2/C^2) x (1.0 x 10^-9 C) x (-1.0 x 10^-9 C) / (0.1 m)^2 = 8 x 10^9 N

The magnitude of the force F is 8 x 10^9 N (8 Giga Newtons)

It's important to note that the direction of the force is from the positive charge.

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The minimum distance 'd' between the cars to avoid a collision is either 45 feet if Car B stops instantly or 645 feet if Car B takes 10 seconds to come to a stop after the driver applies the brakes.

To determine the minimum distance 'd' between the cars to avoid a collision, we need to consider the time it takes for both cars to come to a stop after the driver of Car B applies the brakes.

1. Car B:

  - Initial velocity: 60 ft/s

  - Deceleration: -12 ft/s² (negative because it's decelerating)

  - Time to come to a stop: Unknown, denoted as 'tB'

2. Car A:

  - Initial velocity: 60 ft/s

  - Deceleration: -15 ft/s^2 (negative because it's decelerating)

  - Reaction time: 0.75 s

  - Time to come to a stop: 'tB' + Reaction time

Since both cars come to a stop, we can equate their respective distances traveled to zero using the kinematic equation:

Distance = Initial velocity × Time + 0.5 × Acceleration × Time²

For Car B:

0 = 60 ft/s × tB + 0.5 × (-12 ft/s²) × tB²

Simplifying this equation will give us the time 'tB' for Car B to come to a stop.

For Car A:

0 = 60 ft/s × (tB + 0.75 s) + 0.5 × (-15 ft/s²) × (tB + 0.75 s)²

Simplifying this equation will give us the total time for Car A to come to a stop.

To find the minimum distance 'd' between the cars, we need to determine the value of 'd' when both cars come to a stop simultaneously. This occurs when the total time for Car A to stop is equal to 'tB'. Substitute this value into the equation:

d = 60 ft/s × (tB + 0.75 s)

0 = 60tB - 6tB²

This is a quadratic equation in terms of 'tB'. Rearranging the equation:

6tB² - 60tB = 0

Factor out a common term of 6tB:

6tB(tB - 10) = 0

This equation will be satisfied when either 6tB = 0 or tB - 10 = 0:

1) 6tB = 0

  tB = 0

2) tB - 10 = 0

  tB = 10

We have two possible solutions for 'tB': tB = 0 and tB = 10.

Now let's substitute these values into the equation for 'd' to find the minimum distance:

For tB = 0:

d = 60 ft/s × (0 + 0.75 s) = 45 ft

For tB = 10:

d = 60 ft/s × (10 + 0.75 s) = 645 ft

Therefore, the minimum distance 'd' between the cars to avoid a collision is 45 feet when Car B stops instantly, or 645 feet when Car B takes 10 seconds to stop.

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The voltage induced across a coil of 22 mH (millihenries) is:

a. 22 V

b. 440 V

c. 1.32 V

The voltage induced across a coil can be calculated using the formula:

V = L * di/dt

where V is the voltage induced, L is the inductance of the coil, di/dt is the rate of change of current.

a. For a rate of change of current of 1 A/s, the voltage induced is:

V = (22 mH) * (1 A/s) = 22 V

b. For a rate of change of current of 20 mA/ms, the voltage induced is:

V = (22 mH) * (20 mA/ms) = 440 V

c. For a rate of change of current of 6 mA/100 μs, the voltage induced is:

V = (22 mH) * (6 mA/100 μs) = 1.32 V

Therefore, the voltage induced across the coil depends on the rate of change of current and the inductance of the coil.

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Answer:

The answer is 40°

Explanation:

Law of reflection

0i=0r

0i=angle of incidence

0r=angle of reflection

0r=40°

True, The vitreous fluid fills the anterior area of the eye. At which optic nerve exits the eyeball, the optic disc creates a blind patch.

Light that enters your eye is converted by the retina into electrical signals that your nerve cells sends to your brain, which produce the images you see. It's an important aspect of your vision. The coating at the back of our eyeball is called the retina.

Loss of eyesight is frequently caused by retinal damage. According to medical professionals, blood vessels are impacted when the retina is hurt due to a disease or an accident. Between the brain and the optic nerve, neurons are transported by the veins. Neurons die when they are harmed, which prevents the brain from receiving visual information.

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Answer:

In a longitudinal wave, the crest and trough of a transverse wave correspond respectively to the compression, and the rarefaction.

Explanation:

Answer:

well they make the siren go beacaus eyou are doing somthing wrong so what were you thinking

Explanation:

Answer: it’s when Somethisomething is at the High Point like the top of the roller coaster or the top of the hill I will add a photo to explain

Explanation:

Answer:

(3rd Question about the Black Widow Pulsar)

J1311 is a fast spinning neutron star, which means it emits strong beams of radiation from it's poles.

As the beam of the pulsar sweeps across the surface of the companion star, it heats it up and blows its material outward into space, thus decreasing its mass.

The statements true in regards to heat is 3. Heat is a form of energy, can be reflected by a mirror, and cannot pass through a vacuum.

Heat is a form of energy. Heat is the transfer of thermal energy from one object to another. Thermal energy is the energy of motion of the particles in an object. Heat can be reflected by a mirror. Heat is a form of electromagnetic radiation, and electromagnetic radiation can be reflected by mirrors.

Heat cannot pass through a vacuum. Heat is a form of electromagnetic radiation, and electromagnetic radiation cannot pass through a vacuum. Heat is not an electromagnetic radiation. It is a form of energy that is transferred from one object to another because of a difference in temperature.

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Complete question:

Which of the following statements are true regarding heat?

(a) Heat is a form of energy

(b) Heat can be reflected by mirror

(c) Heat is an electromagnetic radiation

(d) Heat can pass through vacuum

Select the correct answer from the codes given below :

1. 1, 2 and 3

2. 2, 3 and 4

3. 1, 2 and 4

4. 1, 3 and 4