two blocks are attached to opposite ends of a massless rope that goes over a massless, frictionless, stationary pulley. one of the blocks, with a mass of 3.0 kg accelerates downward at 34g.

Thorough inquiry and analysis of materials and sources to establish facts and reach new findings are known as resarch. False is the best answer from the choices provided

Thorough inquiry and analysis of materials and sources to establish facts and reach new findings.

It is false that researchers are required to evaluate and remark on the work of other researchers. It is not their responsibility - they do not have to do it,

But they may if they want to and if the author allows them to. However, they are not compelled to do so by law or anything else. They do it simply out of goodwill or genuine interest.

Hence False is the best answer from the choices provided.

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Answer: false

Explanation:

Answer:

1.11111 century mother duck

The statement that is not true about Gravity is option B) the center of gravity coincides with the geometric center.

The center of gravity is the point where the entire weight of an object appears to act. It is the point where the force of gravity is concentrated. On the other hand, the geometric center is the center of an object based on its shape or dimensions. These two centers may not necessarily coincide, especially for irregularly shaped objects.

Option A is true because the center of gravity will come to rest below the pivot when an object is free to rotate. This is because the weight of the object acts downwards, and the center of gravity is the point where this weight is concentrated.

Option C is also true because the torque due to gravity can be calculated by considering the object's weight as acting through the center of gravity. The torque due to gravity is the turning effect of the force of gravity on an object.

Option D is also true because for objects that are small compared to the Earth, the center of gravity and the center of mass are essentially the same. The center of mass is the point where an object's mass is concentrated. It is also the point where the object is balanced.

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The precise time when puberty begins is influenced by multiple factors, and among the options provided, the age of the person (option C) is the most significant determining factor.The correct answer is (C).

Puberty is a complex process triggered by hormonal changes that lead to physical and sexual maturation. However, it is important to note that the onset of puberty can vary among individuals.

The age of the person plays a crucial role in initiating puberty, with a typical range between 8 and 14 years for girls and 9 and 16 years for boys.

However, it is not solely dependent on chronological age, as there can be variations influenced by genetic and environmental factors.

While factors like neurological programming (option A), reaching a critical weight level (option B), and personality (option D) can have some impact on the timing of puberty, they are secondary factors and do not solely determine its onset.

The intricate interplay between genetic, hormonal, and environmental factors governs the initiation of puberty, making it a complex and individualized process.The correct answer is (C).

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Answer:

Mass and gravity

Explanation:

\({ \rm{weight = mass \times gravity}}\)

Weight is the force exerted on an object due to gravity. The correct answer is mass and gravity. The correct option is an option  (3).

Weight requires both mass and gravity.

The formula for calculating weight is given by:

Weight = mass × gravitational acceleration

W = m × g

The gravitational acceleration is known by the strength of the gravitational field, which is typically constant at any given point.

The mass of an object and the strength of its gravitational field is its weight. It is the gravitational force that pulls an object toward the center of the Earth.

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Therefore, The correct option is (3).

The complete question is:

What does weight require?

1) gravity and volume

2) only mass

3) mass and gravity

4) mass and volume

The value of resistor R that gives the circuit in the figure a time constant of 22 μs is 220 Ω.

The circuit that is in the figure is shown below:Given that time constant (RC) = 22 μs. To find the value of resistor R, we need to use the formula for the time constant:

RC = τ, where R is the resistance and C is the capacitance of the circuit.

Rearranging the above formula, we get:R = τ / C

Where τ is the time constant and C is the capacitance of the circuit.

From the figure, the capacitance is given as 0.1 μF

.Substituting the values of τ and C in the above formula, we get:

R = (22 × 10⁻⁶ s) / (0.1 × 10⁻⁶ F)

R = 220 Ω

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The voltage across the AC power supply varies sinusoidally.

The given statement describes the voltage across the terminals of an AC (alternating current) power supply. The voltage is described by the equation v = v0 cos(ωt), where v is the instantaneous voltage, v0 is the voltage amplitude or maximum voltage, ω is the angular frequency, and t is the time.

In this case, the voltage amplitude is given as v0 = 49.0 V, indicating that the maximum voltage reached is 49.0 volts. The cosine function represents the periodic variation of the voltage with time. As time progresses, the voltage alternates between positive and negative values, following a cosine waveform.

The angular frequency ω determines the rate at which the voltage oscillates. It is related to the frequency f of the AC power supply through the equation ω = 2πf, where π is a mathematical constant approximately equal to 3.14159. The frequency f represents the number of complete cycles of voltage per second.

Overall, the given information describes the voltage behavior of an AC power supply, with a specified voltage amplitude and a variation pattern determined by a cosine function.

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The unknown wavelength is 400 nm.

When two light waves interfere constructively, the path difference between them must be equal to an integer number of wavelengths. In this problem, the path difference between the m=4 bright fringe of the unknown wavelength and the m=3 bright orange fringe is three wavelengths of orange light. Therefore, the path difference between the two sources is:

(4λ_u - 3λ_o) = 3λ_o

where λ_u is the unknown wavelength and λ_o is the wavelength of the orange light. Solving for λ_u gives:

λ_u = (3λ_o + 3λ_o)/4 = 1.5λ_o/2

Substituting λ_o = 500 nm gives:

λ_u = 1.5(500 nm)/2 = 375 nm

However, this is not a visible wavelength of light. The problem states that the unknown wavelength is visible, so we must assume that the m=4 bright fringe of the unknown wavelength actually overlaps the m=3 bright fringe of orange light, but is not exactly aligned with it. This means that the path difference is slightly less than three wavelengths of orange light. The only visible wavelength that satisfies this condition is 400 nm, which is violet light. Therefore, the unknown wavelength is 400 nm.

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The femur can withstand a compression of about 4.1945 mm before breaking.

We can use the formula for compressive stress to calculate the amount of compression that the femur bone can withstand before breaking:

Stress = Force / Area

where the force is the force applied to the bone and the area is the cross-sectional area of the bone.

To find the cross-sectional area of the femur bone, we can assume that it has a circular cross-section and use the formula:

Area = πr^2

where r is the radius of the cross-section.

Since the length of the femur bone is 0.5 m, we can assume that the cross-sectional area remains constant along its length.

Let's assume that the force required to break the bone is the maximum compressive stress that it can withstand, which is 1.51 × 10^8 Pa. We can rearrange the stress formula to solve for the force.

We can use the equation for strain under compression:

strain = stress / Young's modulus

where stress is the maximum stress the bone can withstand before breaking, and Young's modulus is a measure of the stiffness of the material. The strain is a measure of how much the bone compresses under stress.

To find the compression distance, we can rearrange this equation to solve for the compression distance:

compression distance = strain x original length

where the original length is the length of the bone before compression

Substituting the given values:

stress = 1.51 × 10^8 Pa

Young's modulus = 1.8 × 10^10 Pa

original length = 0.5 m

First, we can calculate the strain:

strain = stress / Young's modulus = (1.51 × 10^8 Pa) / (1.8 × 10^10 Pa) ≈ 0.008389

Next, we can calculate the compression distance:

compression distance = strain x original length = (0.008389) x (0.5 m) = 0.0041945 m

Finally, we can convert the result to millimeters:

compression distance = 0.0041945 m x (1000 mm/m) = 4.1945 mm

Therefore, the femur can withstand a compression of about 4.1945 mm before breaking using Stress = Force / Area

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If a kiloparsec (kpc) is equal to 1000 parsecs, light years is a kiloparsec equal to: 3, 260 light years.

The distance that light travels in a light-year is one year. At 186,000 miles (300,000 kilometres) per second and 5.88 trillion miles (9.46 trillion kilometres) per year, light travels through interstellar space.

Since a light-year is the maximum distance light can travel in one year and nothing can move faster than that, the answer appears to be 13.8 billion light-years.

Thus, 3,260 many light years is a kiloparsec.

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Answer:

Explanation:

A concave mirror is a curved mirror that is coated outwards. The outer part of the mirror is always coated. The nature of image formed by an object placed in front of a concave mirror can be real or virtual depending on the distance of the object on the axis from the mirror. The only time the object produces a virtual image is when it is placed between the focus and the pole of the mirror. The virtual image formed is a "MAGNIFIED and upright image"

For a convex mirror, the inner part is always coated and the nature of the image formed by the object doesn't depend on the distance between the image and the mirror. No matter where the object is placed, the image formed will always be virtual, upright and DIMINISHED. This means that magnification is always less than 1.

For a plane mirror, the nature of the image produced by a plane mirror also virtual because it is always formed behind the mirror. The size of the image formed is always THE SAME as that of the object. This means that the magnification is always equal to 1.

a) In summary, the difference between virtual images produced by concave, plane, and convex mirrors is that virtual images produced by concave mirror are MAGNIFIED, virtual images produced by plane mirror are THE SAME SIZE as that of the object and virtual images produced by convex mirrors are always DIMINISHED.

b) Magnification is defined as the ratio of the image distance to the object distance. Mag = v/u

Note that object distances are always positive, hence it is only the image distance that can either be positive or negative which in turn affects the magnification causing it to be positive or negative.

Negative image distance shows that the image is virtual while positive image distance shows that the image is real.

A negative magnification therefore shows that the nature of the image is a virtual image.

Answer:

Heat

Explanation:

Because chemical energy is stored, it is a form of potential energy. When a chemical reaction takes place, the stored chemical energy is released. Heat is often produced as a by-product of a chemical reaction – this is called an exothermic reaction.

Hope this helped.

Explanation:

Answer Should be B.

Its in Form of Heat.

Answer:

gravity

Explanation:

keeps the ball down on the surface

When dribbling a ball, the gravity should control the direction and downward motion of the ball.

When a particle is hurled obliquely near the surface of the earth, it travels along a curved path while accelerating continuously in the direction of the planet's centre (we assume the particle stays close to the surface of the globe). Such a particle's motion is known as projectile motion, and its route is referred to as a projectile.

Two distinct rectilinear motions occur simultaneously in a projectile motion:

When a ball is sent into the air at a certain speed, the only force acting on it is the acceleration caused by gravity (g).

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Answer:

1428  m/s

Explanation:

Given that,

The frequency hear by a dolphin, f = 280 kHz

We need to find the speed of sound in water if a wave with this frequency has a wavelength  of 0.51 cm.

The formula for the speed in terms of wavelength and frequency is given by :

\(v=f\lambda\\\\v=280\times 10^3\times 0.51\times 10^{-2}\\\\v=1428\ m/s\)

So, the speed of sound in water is 1428  m/s.

The work done by the tension in the string on the ball - tension does no work at all is the correct answer.

The forces tugging on the rope from either end cause the tension in a particular strand of string or rope. Keep in mind that force is defined as mass times acceleration. If the rope is stretched tightly, any change in the mass or acceleration of the objects it is supporting will result in a change in the tension of the rope.

A force known as tension is particularly effective on medium-length materials like rope and cable that are also flexible. A gravitational force still exists in tension. When the body is traveling upward, the tension is denoted by the formula T = W + ma. The thickness is the same as T = W - ma when the body descends.

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Answer:

Scientific theories attempt to explain how events occur in the natural world.

Answer:

The answer is option  A. Scientific theories attempt to explain an entire group of related phenomena.

Explanation:

I got it right on the test

Hope it helps!

Answer:

See below

Explanation:

We know that the unit of pressure is Pascal.

We have,

Pressure = \( \frac{force}{area} \)

\( = \frac{m \times g}{l \times b} \)

\( = \frac{kg \: \times \: {meter \: per \: second \: }^{2} }{ {m}^{2} } \)

\( = kg \: {m}^{ - 1} \: {s}^{ - 2} \)

The unit of pressure i.e Pascal is derived unit because it is expressed depending on more than two units i.e kg / [ m × s × s ]

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Answer:

Speed: 109.4–120.7 km/h (68.0–75.0 mph)

Strength: Couldn't find out.

Explanation:

The increase in the length of the rail on a hot day when the temperature is 30 °C is 0.0363 m.

Length is a measurement of distance or size. It is one of three fundamental measurements (along with width and height) used to describe the size of an object. Length can be measured in a variety of units, such as meters, feet, inches, or centimeters. In mathematics, length is defined as the longest dimension of an object or distance between two points. In physics, length is a fundamental quantity used to measure objects and distances.

The increase in the length of the rail on a hot day when the temperature is 30 °C can be calculated using the formula for linear expansion:

ΔL = L0 * α * ΔT

Where L0 is the original length of the rail (34 m), α is the linear expansion coefficient of steel (11 x 10-6 (°C)-1), and ΔT is the change in temperature (30 °C - (-3 °C) = 33 °C).

Plugging in the values, we get:

ΔL = 34 m * 11 x 10-6 (°C)-1 * 33 °C

ΔL = 0.0363 m

Therefore, the increase in the length of the rail on a hot day when the temperature is 30 °C is 0.0363 m.

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Answer:

the answer is at the BOTTOM OF THEIR QUESTION

Explanation:

IT IS CORRECT BTW

Answer:

A

Explanation:

Because we need clean water to obtain a healthy diet, need oxygen which plants provide through photosynthesis and soil is important for food.

Sensory memory it stores sensory input in its raw form for a very brief duration; essentially long enough for the brain to register and start processing the information, Working memory is the component of memory in which current conscious mental activity occurs,  Long-term memory is also known as permanent memory.

The three components of memory described in the provided statements are:

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After slowing down by 15 miles per hour and reducing the speed by one third, you are now going at 60 miles per hour.

If you are initially driving at a rate of one and a half miles per minute, it means you are traveling at a speed of 90 miles per hour (since there are 60 minutes in an hour).

In the second step, you slow down by 15 miles per hour. This reduces your speed to 75 miles per hour.

Finally, you reduce your speed by one third, which means you need to subtract one third of 75 from 75. One third of 75 is 25, so subtracting 25 from 75 gives you a speed of 50 miles per hour.

Therefore, after slowing down by 15 miles per hour and then reducing your speed by one third, you are now traveling at a speed of 50 miles per hour.

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We have the next definitions

Distance It is all the way traveled by a mobile or moving body.

Displacement: It is a straight line distance from an initial position to a final position. This distance has direction therefore it is a vector

Therefore the statement that is not true is

Its displacement can be larger than its distance.

ANSWER

Chemists commonly use a rule of thumb that an increase of 10 K in temperature doubles the rate of a reaction. The activation energy be for this statement to be true for a temperature increase from 25 to 35°C is must be 52.5 kJ/mol.

To find the activation energy, we can use the Arrhenius equation k = A * e^(-Ea/RT). Where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant (8.314 J/mol*K), and T is the temperature in Kelvin. We are given that the rate of the reaction doubles when the temperature increases from 25°C to 35°C, or from 298 K to 308 K.

We can set up the equation as follows:
2k = A * e^(-Ea/(8.314*308))
k = A * e^(-Ea/(8.314*298))
Dividing the first equation by the second equation gives us:
2 = e^(-Ea/(8.314*308) + Ea/(8.314*298))

Taking the natural log of both sides gives us: ln(2) = (-Ea/(8.314*308) + Ea/(8.314*298))
Solving for Ea gives us: Ea = (ln(2) * 8.314 * 308 * 298) / (308 - 298)
Ea = 52.5 kJ/mol
Therefore, the activation energy must be 52.5 kJ/mol for the statement to be true for a temperature increase from 25 to 35°C.

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The distance between two adjacent nodes in terms of the wavelength λ of the standing wave is B) The distance between the two adjacent nodes = λ/2.

A standing wave is a wave that appears to be standing still, resulting from the interference of two waves of identical wavelength and frequency traveling in opposite directions.

In standing waves, the nodes are located at fixed points of the wave, with no displacement at the nodes. Standing waves are created by the superposition of two waves of the same amplitude and frequency traveling in opposite directions in a medium, resulting in a wave that appears to be standing still.

The distance between the two adjacent nodes is equal to half of the wavelength λ of the standing wave, according to the formula,

Distance between the adjacent nodes = λ/2.

Therefore, option B is correct.

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Answer: the answer is B. It slows down the transfer of thermal energy from inside to outside the coat

Explanation: I took the test and got this right:) Hope this helped!!

Answer:

B. It slows down the transfer of thermal energy from inside to outside the coat.

Answer:

1) Proportion of light bulbs lasting less than 1380 hours.

P(X<1380) = 0.2317(4dp)

2)The longest lasting 5% of light bulbs last 1736.7 hours or more

3) The middle 85% of light bulbs last between 1274.1 and 1705.9 hours

4) Proportion of light bulbs lasting between 1310 hours and 1680 hours is 0.7823 (4 dp)

5) Proportion of light bulbs lasting more than 1680 hours is 0.1026(4dp)

6) The shortest lasting 10% of light bulbs last 1297.8 hours.

Explanation:

The calculations are handwritten and attached as files to this solution. Check the files below for all the workings