Which of these was NOT seen telescopically by Galileo?

O A. sunspots
O B. Four moons around Jupiter
O C. craters and mare on the Moon
O D. Venus' phase cycle
O E. stellar paralla

The gross weight of the package in kilograms that Donna send to her grandson as birthday present is 7.675 kg.

The weight of the box in which Donna has sent the present (w1)=  0.875 kg. Now  we know, 1 kg = 1000 grams .  So , 0.875 kg = 0.875 * 1000 = 875 grams.

Hence w1=875 grams is the weight of the box in which the present is there.

The weight of the present itself (w2)=6800 grams.

So, the gross weight of the package = w1+w2= 875 +6800 grams = 7675 grams.

So, the gross weight of the package ( the box+the gift) = 7675grams =7675 / 1000 = 7.675 kg.

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In the experiment to investigate how the diameter of a steel ball affects the terminal velocity;

An object falling through a fluid at its greatest speed is said to have reached its terminal velocity. When the combined drag and buoyancy forces are equal to the force of gravity pulling the object downward, it is observed.

To investigate how the diameter of a steel ball affects the terminal velocity, a student should get steel balls of increasing diameter and record the time it takes for the balls to attain terminal velocity in a viscous fluid.

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Energy which is lost by the car on descent is 980×10⁴ J

Let us calculate the energy of car at various heights.

At height 3000 m:

Mass (m) = 1000 Kg

Given, Acceleration due to gravity (g) = 9.8 m/s²

Height (h) = 3000 m

Energy (E) = To be calculated

E = mgh

E = 1000 × 9.8 × 3000

E = 29400000 J

At height 2000 m:

Mass (m) = 1000 Kg

Acceleration due to gravity (g) = 9.8 m/s²

Height (h) = 2000 m

Energy (E) =?

E = mgh

E = 1000 × 9.8 × 2000

E = 19600000 J

Finally, we shall determine the the energy lost

Energy calculated 3000 m = 29400000 J

Energy calculated 2000 m = 19600000 J

Energy lost =?

Energy lost = Energy at 3000 m – Energy at 2000 m

Energy lost = 29400000 – 19600000

Energy lost = 980×10⁴ J

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The amount of energy lost by the car when it descended from a height of 3000 m to 2000 m is 980 ×  10⁵ J.

Given that,

Mass m = 1000 kg

Acceleration due to gravity g = 9.8 m/s²

Height h = 3000 m

Energy E = ?

We know that, E = m g h = 1000 × 9.8 × 3000 = 29400000 J = 294 × 10⁵ J.

At height 2000 m, the energy is,

E = m g h = 1000 × 9.8 × 2000 = 19600000 J = 196 × 10⁵ J.

The difference in energies at the height 3000 m and 2000 m is nothing but the energy lost.

So, the energy lost = 29400000 J - 19600000 J = 980 × 10⁵ J

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A mass was created by the combination of various materials. There is a good chance that this information will be utilized to show how the solar system formed in its early stages.

One of a body's fundamental characteristics is mass. Before the discovery of the atom and particle physics, it was widely considered to be connected to the amount of matter in a physical body. It was discovered that, in theory, the same amount of matter might contain various atoms and elementary particles. One of a body's fundamental characteristics is mass. Before the discovery of the atom and particle physics, it was widely considered to be connected to the amount of matter in a physical body. Theoretically, although having the same amount of stuff, different atoms and elementary particles were discovered to have distinct masses.

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The evidence that most likely indicates the beginning of solar system formation is that materials were pulled together by gravity.

Formation. About 4.5 billion years ago, a dense cloud of interstellar gas and dust gave rise to our solar system. The supernova shockwave from a nearby exploding star, or supernova, may have caused the cloud to collapse. This dust cloud burst into a spinning disk of material known as a solar nebula when it disintegrated.

According to scientists, Earth, and other terrestrial planets, it was created several billion years ago when hot blobs of molten metal and rock coalesced from the combination of dust and gas. They underwent four stages of creation before becoming distinct planets: Cratering, Surface Evolution, Flooding, and Differentiation

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An item obtains mechanical energy when an external force applies positive work to it.

The object experiences negative work when the force and displacement are in the opposite directions; as a result, the item loses mechanical energy.

The power needed, which is defined as energy per unit of time, depends on the velocity.

More power is needed to move a certain distance quickly, thus you must provide the same quantity of energy over a shorter period of time.

Work is defined as the energy transferred while exerting force to move an item across a distance. It is the result of distance and force.

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The pattern that would match creating a negative ion is that they can gain one electron and become 1-.

For example Group 16 elements gain two electrons to become 2-, and Group 15 elements gain three electrons to become 3-.

The pattern that would match creating a positive ion is when they give up one electron and become +1.

In the case of Group 2 elements give up two electrons to become 2+, and Group 3 give up three electrons to become 3+

An ion is described as an atom or molecule with a net electrical charge.

We know that some elements can form ions with two or more different charges. Iron (Fe), for example, can form both an iron ion with 2+ (Fe²⁺) and an iron ion with 3+ (Fe³⁺).

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According to the given statement The crane would develop a power of 405.18 Watts.

The term "power" refers to the rate at which the task is accomplished. It may also be defined as the rate or energy exchange. The SI unit of power is the watt (W), that is derived on joules per second (J/s). A quantity called a backhand (horsepower), which is roughly comparable to 745.7 watts, is occasionally used to characterize the power of motor vehicles and other equipment.

The formula for calculating power is:

Power = Workdone / Time

The SI unit for Power is Watt.

The crane completes 72933 Joules of work for the specified task in 3 minutes and 180 seconds.

Hence,

Power = 72933 J / 180  seconds

Power = 405.18 Watt.

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Fossil fuels, hydroelectric power, and wind power ultimately get their energy from sun. Hence, the correct option is B. the sun.

On earth, energy comes in a variety of shapes and sizes. The sun is regarded as the earth's fundamental source of energy. Energy is a quantifiable property that can be transferred from an item to perform work in physics. Thus, the ability to perform any kind of physical action can be described as having energy. Thus, we can sum up the definition of energy as follows:

The capacity to work comes from energy.

Hydrocarbons, which are made up of carbon, hydrogen, and oxygen, are what we refer to as fossil fuels. These are derived from the breakdown of living things like animals and plants. Nearly all of the fossil energy comes from the sun.

A secondary source of solar energy, hydroelectricity is produced when water flows from a high potential to a low potential. It is a more environmentally friendly option than electricity because it doesn't emit waste, smoke, or heat.

High-speed wind is used to produce the renewable energy known as wind power. It is a renewable source of energy that is used to power wind turbines.

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The position-time equation of the ball that is thrown upward with an initial speed of 3.0 m/s from an initial height of 1.5 m and afterward, it begins moving downward with an acceleration of9.81 m/s² is:

A position-time equation is an equation that gives the displacement of a moving object directly proportional to both the velocity and time of the object as it moves.

The position-time equation of the ball that is thrown upward with an initial speed of 3.0 m/s from an initial height of 1.5 m and afterward, it begins moving downward with an acceleration of9.81 m/s² is given below:

Using the vertical motion model;

h = -9.8t² + vt + s

where;

h is the maximum height of the ball

v is the initial velocity in meters/second, and

s is the height in meters.

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Answer:

1.5t+3t-4.9t^2

Explanation:

a(acceleration)=-9.81m/s^2

u(Initial Speed)=3m/s

y0(Initial Height)=1.5m

y=y0+ut+0.50(-9.8)t^2

After plugging everything in we get:

y=1.5+3t-0.50(9.8)t^2

After that, you multiply, -0.50 by 9.8 and get:

y=1.5+3t-4.9t^2 as your final answer

The amount of ice that is visible whilst floating in water does have a fractional value of 0.083.

The density of a material or thing is a measure of how densely its mass is packed. The density of a substance or object may be calculated using the following formula: mass in kilograms divided by volume in cubic meters equals density in kilograms per cubic meter. Density is described as mass spread inside a volume, in other words. Or, to put it in another way, it's the number of kilograms that anything weighing 1 meter cubed weighs. If each cubic meter of the substance weights more, it is denser.

fraction of the ice's volume.

Ice has a known hardness of 917 kg/m3.

Moreover, fresh water density= 1000 kg/m³

Assume that V is the total volume and that v is the amount of ice over water.

Volume displacement in water then equals V-v,

V917g = (V-v) 1000g V-v/V=917/1000 1-v/V=917/1000 v/V=1-917/1000 v/V=83/1000 =0.083 using the law of flotation

0.083 is the resulting fractional value.

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Plugging in the given values and solving for the final velocity of the 6kg block will give you the speed of the 6.00-kg block after it has descended 1.50 m. In this case, the normal force is the weight of the 8kg block, and the displacement is the distance that the 8kg block moves.

To calculate the speed of the 6.00-kg block after it has descended 1.50 m, you can use the conservation of mechanical energy. The initial mechanical energy of the system is the potential energy of the 6.00-kg block (mgh) and the potential energy of the 8.00-kg block (mgh). As the blocks move, some of this energy is converted into kinetic energy, and some is lost to friction. The equation for the conservation of mechanical energy is:

E_initial = E_final + W_friction

Where E_initial is the initial mechanical energy of the system, E_final is the final mechanical energy of the system, and W_friction is the work done by friction.

The final mechanical energy of the system is the kinetic energy of the 6.00-kg block (1/2 mv²) and the potential energy of the 8.00-kg block (mgh).

To calculate the work done by friction, you can use the equation:

W_friction = force x distance x cos(theta)

Where force is the force of friction, distance is the distance over which the force of friction acts, and theta is the angle between the force of friction and the displacement. The force of friction is the coefficient of kinetic friction times the normal force.

In this case, the normal force is the weight of the 8kg block, and the displacement is the distance that the 8kg block moves.

W_friction = m_kF_nd

Where m_k = 0.25 is the coefficient of kinetic friction, F_n = 8*9.8 N is the normal force, and d = 1.5m is the distance that the 8kg block moves.

Plugging in the given values and solving for the final velocity of the 6kg block will give you the speed of the 6.00-kg block after it has descended 1.50 m.

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The net force on the balloon will be 0.0807 pounds..

The apparent weight of an object at its lowest point would be equal to its normal force. The formula to employ for buoyant force was F = Vg, where seems to be the fluid density, not just the object density. V stands for the fluid displacement's volume.

Gravity pulls liquid helium downward with such a force about 0.0114 pounds for one cubic left foot helium-filled balloon, whereas the air drives up with such an equal must weight of the oxygen the helium evacuated or 0.0807 pounds. The upward and downward forces differ by 0.069 pounds.

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The decimal place moves the left when we convert smaller unit to larger units. Decimal place moves to the right when larger unit converts to smaller units. When centimeter is converted to meters, decimal place moves to the left.

Decimal places are number of digits coming after the decimal point. The conversion of bigger units to smaller units of amount or any physical quantity move the decimal place to the left and when the reverse is done, decimal place moves to the right side.

Hence, centimeters to meters moves decimal place to left.

megameters to meters - right

kilometers to millimeters - right

micrometer to millimeters - left

millimeters to kilometer - left.

One centimeter = 0.01 m

Hence there are 100 cm in 1 m.

There are 100 years in one century and 1000 years in a millennium.

One millimeter is 10⁻³ m. Then there are 1000 mm in one m.

One microliter is 10⁻⁶ L. Then there are 10⁶ microliters in one liter. There are 1000 m in one kilometer. One megagrams is 10⁶ grams.

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Fundamentally, sound waves differ from other waves.

Electromagnetic waves include radio waves, light waves, and X-rays.

Which of the following stands apart from the others fundamentally? Reasoning: Mechanical waves are what make up sound. The remaining responses involve EM waves, which are NOT mechanical waves.

Light and radio waves are both electromagnetic waves; their primary distinction is in their frequency. While the oscillations of the electrons within atoms produce light waves, radio waves are produced by the acceleration of electrons in a radio antenna.

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The metals were transported to the core via o convection.Higher temperatures are preferable for condensing the heavier rock and metallic elements.

As the rocky planets formed, this concentration in metals close to the sun was incorporated into them.Iron and nickel, two readily available metals, moved toward the planet centers, where gravitational pull was highest, as the planetary systems developed.

Unlike other planets which lack a solid surface, terrestrial planets are composed of rocks or metals and have a hard surface.A few moons, a molten hard rock core, and landforms like cliffs, valleys, volcanoes, and craters are other characteristics of terrestrial planets.

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The average speed of the electrons in a lamp when a light switch is flipped on in a DC circuit is less than 1 cm/s.

When the switch is flipped to the on position, the circuit is closed and a potential difference in electricity is created between the two ends of the external circuit. Nearly as fast as light, electromagnetic energy and information can go along a cable. The electrons themselves move considerably more slowly. The electromagnetic wave that is resonating through the electrons is what causes it to move almost as quickly as light. The actual propagation speed depends on the wire's diameter and electrical characteristics, such as its inductance, although it typically hovers around 90% of the speed of light, or 270,000 km/s.

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In the case of glass to air, the speed of light is the same in both materials, so the refractive index is 1.0.

The refractive index of a material is a measure of how much the speed of light is reduced as it passes through the material. When light travels from one medium to another, the refractive index is determined by the ratio of the speed of light in the two materials.

When light enters a material, the speed of light is reduced. This happens because the light interacts with the material and is absorbed and scattered.

This results in a decrease in the speed of light, and an increase in the refractive index. The refractive index is a measure of how much the speed of light is reduced as it passes through the material. The higher the refractive index, the more the speed of light is reduced.

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The brightest stars and planets fall around -2 on this scale. The top limit is around +5.5 in a rural, unpolluted, serene sky with adequate, unaided vision.

Stars are any large, gaseous bodies that are self-luminous and emit light as a result of their own internal energy sources. Only a very small portion of the observable universe's tens of billions of trillions of stars are visible to the unaided eye. In pairings, multiple systems, or stellar clusters, there are a lot of stars. These star groupings' members are gravitationally attracted to one another and are physically connected by a shared origin. Stellar associations, which are loose collections of stars with a comparable physical makeup but lack collective mass to maintain their organisation, are somewhat linked to star clusters.

On a scale of apparent luminance, stars are rated. The star is fainter the higher the number. On this scale, the brightest stars and planets fall around -2. In a rural, unpolluted, calm sky with decent, unaided vision, +5.5 is roughly the upper limit. The Pleiades star cluster (M45, if I remember correctly), which contains stars with apparent magnitudes of +3 and fainter, was once employed by the Romans to gauge someone's eye-sight.

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Based on the provided information, the excess electrons are 2.559 x 10^14 electrons and mass increase would be 2.329 x 10^-16 kg.

In the given case, as the electron affinity of the wool is less than human body, some amount of electron will be transferred from wool to the feet of the person. The total amount of charge that is accumulated on her feet is -41 micro coulomb. When a body gets negative charge, an integral amount of electronic charge is transferred to the body.

Total charge = number of electrons × one electronic charge

Q = n x e

As e = - 1.602 x 10^-19 coulomb and Q = -41 micro coulomb = -41 x 10^-6 coulomb

Hence,

-41 x 10^-6 = n x - 1.602 x 10^-19

n = 2.559 x 10^14 electrons

Hence, the excess electron would be 2.559 x 10^14 electrons.

Mass of one electron = 9.1 x 10^-31 kg

Total mass increased will be equal to the total mass of excess electrons i.e.,

Mass increased = me x n = 9.1 x 10^-31 x 2.559 x 10^14 = 2.329 x 10^-16 kg.

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The force does the ground exert on her when a 42 kg parachutist lands moving straight downward with a speed of 3.85 m/s is 415.03N

Given the mass of parachutist (m) = 42kg

speed of parachute (v) = 3.85m/s

distance the parachutist covers (s) = 0.750m

Finally the parachutist comes to rest the final velocity = 0m/s

constant acceleration is maintained.

We know from newtons law of motion F = ma

Here v^2 - u^2 = 2as. So we can find acceleration as:

a = -u^2/2s = -3.85 x 3.85/ 2x 0.750 = -9.88m/s^2

The force exerted (F) = 42 x -9.88 = -415.03N

Hence force does the ground exert on her is 415.03N.

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The force does the ground exert on her when a 42 kg parachutist lands moving straight downward with a speed of 3.85 m/s is 415.03N

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.

A spring balance can be used to calculate the Force. Newton is the SI unit of force (N).

Given the mass of parachutist (m) = 42kg

speed of parachute (v) = 3.85m/s

distance the parachutist covers (s) = 0.750m

Finally the parachutist comes to rest the final velocity = 0m/s

constant acceleration is maintained.

We know from newtons law of motion F = ma

Here v^2 - u^2 = 2as. So we can find acceleration as:

a = -u^2/2s = -3.85 x 3.85/ 2x 0.750 = -9.88m/s^2

The force exerted (F) = 42 x -9.88 = -415.03N

Hence force does the ground exert on her is 415.03N.

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In ten seconds,a total of 5 waves crash onto the shore of the beach .

The distance between each wave crest on the water is 8 meters.

Wave length is the length between two wave crests that is the distance between two wave crests.

We know distance between each wave crest is 8 meters

Total of 5 wave crests, the distance between first and second wave crest is 8 meters

the distance between second and third wave crest is 8 meters

So wave length = 8+8 = 16 meters

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Answer:

values of g (acceleration due to gravity) are different on earth vs. moon

Explanation:

Weight = mg

m = mass

g(earth) = 9.8 m/s²

g on the moon is different because the moon has less mass than earth.

g(moon) = 1.625 m/s²

For example, if your mass on earth is 68 kg, your weight on earth is:

W = (68 kg)(9.8 m/s²) = 666.4 N

On the moon, your mass is still the same (68 kg), but your weight would be:

W = (68 kg)(1.625 m/s²) = 110.5 N

The charge on the capacitor C1 nearest to a when Vab=490V is:

Qa1 =150μC.

The given Values are:

C₁=6.6 C₂=4.4 Vab=490V

Reduction of the farthest right leg yields:

C=(1/C₁+1/C₁+1/C₁)⁻¹

C=(1/6.6μF+ 1/6.6μF+ 1/6.0μF)⁻¹

C=3.1μF=C₁/3

It combines in parallel with C₂ i.e.,

C=4.4μF+3.1μF=7.5μF=C₁

​So, the next reduction is the same as the first: C=3.1μF=C₁/3

​And the next is the same as the second, leaving 3C₁'s in series.

So, Ceq=3.1μF=C₁ /3.

For the three capacitors nearest to points a and b:

QC₁=CeqV=(3.1×10⁻⁶F)(490V)=1.5×10⁻⁴

Therefore, the equivalent capacitance of the network between points a and b. QC=150μC

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The negatively charged van de Graff generator can make a flow of electrons through the tape and these both will repel each other. When the tape comes in contact with the balloon, the positive charges of balloon gets attracted and they stick together.

Electrons are drawn from the earth by a Van de Graaff generator, transported via a belt, and then stored on the big sphere. These electrons are attracted to one another and try to distance themselves from one another by dispersing throughout the surface of the sphere.

Electrons can spread out widely on the earth, thus they will choose the shortest route possible to return to the ground. The electrons from the tape repel the electron from the tape, make the tape negatively charged.

This negatively charged tape when comes in contact with the balloon, it will polarize the balloon and its positive charges aligns with the tape's charge and gets stuck.

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The  hunter have walked to reach the same spot 45.62 m in  single straight - line displacement.

The term "displacement" refers to a shift in an object's position. It is a vector quantity with a magnitude and direction. The symbol for it is an arrow pointing from the initial location to the ending place.

Jack Pott walks 45.0 m south and then he walks 7.50 m east .

Total displacement = √(45.0²+7.50²) m = 45.62 m.

Hence, the  hunter have walked to reach the same spot  45.62 m in  single straight - line displacement.

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Aerial lifts are not permitted for any of the reasons listed below if they fall short of the required work height.

You are not allowed to stand on the middle safety rail, use a step as long as it is 6" or less, or use a 4' step ladder while you are tied off, regardless of how high the aerial lift is above the desired work height. Working from an aerial lift is not allowed while belting off to a nearby pole, building, or piece of machinery. Extensible boom platforms, aerial ladders, vertical towers, and other vehicle-mounted aerial devices are examples of aerial lifts that are used to elevate personnel to job sites above ground. Aerial equipment is defined as lifts whether or not they can rotate about a significantly vertical axis. It can be built of metal, wood, fiber glass reinforced plastic (FRP), or other materials. It can also be electrically or manually operated.

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You can tell the direction of propagation of the initiation by the direction of cloud motion. Correct answer: letter C.

Cloud motion is the speed and direction of the clouds in the sky, which can indicate the direction of the wind and the propagation of the initiation.

This is especially important for forecasting storms and other weather events, as the direction of wind can help to predict the direction of the storm's movement. Additionally, it can also be used to help predict the intensity of the storm, as the speed of the wind can help to determine the strength of the storm.

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Momentum and energy are the two fundamental quantities that are always conserved in collisions, according to classical mechanics. Since we are concerned in the velocities of the objects but kinetic energy could not be conserved after collisions, we will now disregard energy. Energy is a formless substance.

Kinetic energy seems to be the power a thing has as a result of motion. Applying a force is necessary if we wish to accelerate an object. Once the job is finished, energy is transferred to the item, which then moves at a new, constant speed.

The word kinetic is derived from the Greek kintikos, which means "of motion" and is related to the word kinein, which means "to move." kinetic is indeed a relatively new English word compared to several other words with Greek origins; the first documentation of its use originates in the 19th century.

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A force of 3.00 newtons causes the spring to stretch 60.0 cm. Then the spring constant is 5 N/m.

A spring will increase in length if there is a force on the spring. The increase in length of a spring can be different from one spring to another. The difference in the addition of the length of a spring occurs because of the characteristics of the spring between one spring and another which is expressed through the spring constant (k) with units of N/m. The spring force formula is:

                                  F = k.x

Where:

F = force exerted on a spring (N)

k = spring constant (N/m)

x = Addition of spring length due to force (m)

In this question given F = 3.00 N and x = 60.0 cm = 0.6 m

So:

F = k.x

k = F/x

k = 3/0.6

k = 5 N/m

So that the spring constant is 5 N/m.

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The frequency of the second harmonic of a note with a fundamental frequency of 200 Hz is 400 Hz, and the frequency of the third harmonic is 600 Hz.

To calculate the harmonics of a note, you will need to know the fundamental frequency of the note. The frequency of the second harmonic is twice the fundamental frequency, and the frequency of the third harmonic is three times the fundamental frequency. For example, if the fundamental frequency is 200 Hz, then the frequency of the second harmonic is 400 Hz and the frequency of the third harmonic is 600 Hz.

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