Why are masses listed on the periodic table not whole #'s. Ex. 15.9999 for oxygen?​

To determine each property in the three bins, certain items must be measured. The luminosity, surface temperature, and mass are the three important properties of the stars represented by three bins.

The measurement for each property is as follows:

For luminosity: To measure luminosity, we must measure the total amount of energy a star emits in all wavelengths.

For surface temperature: Surface temperature is determined by analyzing the spectrum of light emitted by the star.

The spectrum shows a rainbow of colors, and some colors will be more intense than others. These colors can be used to estimate the temperature of the star's surface.

For mass: Mass is calculated using observations of how the star interacts with its surroundings. Astronomers observe the gravitational effect that a star has on other objects around it. The mass of a star can be estimated using this method.

Stars are gigantic balls of burning gas that light up the sky and heat up planets around them. The sun is a star, for example.

Some stars are smaller and some are larger, but all of them share the same basic structure. The enormous nuclear furnace at the center of every star produces heat and light through fusion.

Stars are made up of mostly hydrogen and helium, but they contain small amounts of other elements. They are classified into three categories based on their luminosity, surface temperature, and mass.

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The image recorded with a CCD (Charge Coupled Device) is better for astronomers than an image recorded on photographic film or plates because a CCD can detect more light and smaller details.

Additionally, CCDs can be read and reset electronically and can produce an image very quickly compared to a film or plate. An image recorded with a CCD is better for astronomers than an image recorded on photographic film or plates because of the following reasons:

CCD (Charge-Coupled Device) sensors, unlike photographic films or plates, have a far more linear response to light. They can handle a higher number of photons per square inch without the contrast distortion, graininess, or noise produced by films.CCD detectors, unlike photographic films or plates, are sensitive to a broader range of light frequencies. They can capture infrared, ultraviolet, and other light frequencies that film can't, allowing astronomers to see the "invisible" or "hidden" areas of space. CCDs are also more sensitive and can detect fainter signals from distant celestial bodies.The high sensitivity of CCD detectors allows them to capture images in far less time than photographic plates or film. Since exposure time is frequently limited by atmospheric interference and telescopic motion, this is critical in astronomy.CCDs, unlike photographic films or plates, don't need to be developed. Astronomers can look at their data instantly, reducing the amount of time it takes to evaluate data by many weeks or even months.

Since CCDs record digital data, they can be adjusted after the fact, making it easier to eliminate or reduce noise, manipulate contrast and brightness, and improve resolution.

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The applied force for the engine will be 24,450 N.

The applied force produced by the engine for a car weighing 12,500 n starting from rest and accelerating to 83.0 km/h in 5.00 s with a friction force of 1350 n is:

Applied force = (Mass x Acceleration) - Friction force

Applied force = (12,500 N x (83.0 km/h / 5.00 s)) - 1350 N

Applied force = 25,800 - 1350 N

Applied force = 24,450 N

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The speed of the ball before the collision was 13 m/s.

According to the conservation of momentum,

Momentum = mass x velocity

For the two objects before the collision:

P1 = M1 x V1 = 2 kg x v m/s = 10 kg m/s

P2 = M2 x V2 = 4 kg x 5 m/s = 20 kg m/s

For the two objects after the collision:

P1' = M1 x V'1 = 2 kg x -1 m/s = -2 kg m/s

P2'= M2 x V'2 = 4 kg x 12 m/s = 48 kg m/s

Since the total momentum of the system is conserved, we have:

P1 + P2 = P1' + P2'

Substituting the values, we get:

2v + 4(5) = -2 + 48

2v + 20 = 46

2v = 26

v = 13 m/s

Therefore, the speed of the glass ball before the collision was 13 m/s.

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The object will decelerate over time, as the net force acting on it decreases. This is because the net force is the vector sum of all forces acting on the object.

When an object is moving to the right in a straight line, and the net force acting on the object is also directed to the right, it means that there is no opposing force to halt its motion.

Therefore, the object will continue to move to the right in a straight line with constant speed since there is no change in the magnitude of the net force.

However, when the net force is directed to the right and is decreasing with time, the object's motion will be altered. The magnitude of the force is decreasing with time, so there will be less force acting on the object.

The force acting on the object is decreasing with time; thus, the object's acceleration will be less than before. As a result, the velocity of the object will decrease with time. Since there is no force opposing the motion, the object will continue to move to the right but with decreasing speed due to the decrease in net force acting on it.

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Car tires are generally considered insulators because they have a very high resistance to the flow of electricity. Insulators are materials that do not allow electric current to flow through them easily.

A substance that conducts heat or energy poorly is known as an insulator. It is a material that has a high electrical resistance, which means that it resists the passage of electric current through it. In electrical circuits, insulators are used to isolate conductors from one another and stop electricity from flowing between them.

Since it prohibits electrons from moving easily through it and has a very high resistivity, the rubber used in car tires functions well as an insulator. This makes it difficult for electric current to pass through the tire, lowering the possibility of electric shock and helping to avoid static electricity buildup.

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The image distance from the lens is calculated to be 6 cm.

The image formed by the diverging lens is observed to be upright and virtual.

The image distance is calculated using the following formula of lens,

1/v = 1/f - 1/u

where,

v is image distance

f is focal length

u is object distance

Focal length f is given as -10 cm as it is diverging.

Object distance u is given as 15 cm.

Putting in the values,

1/v = (-15-10)/150

1/v = -25/150

v = -6 cm

Thus, the image distance is calculated to be 6 cm. As the image is formed by diverging lens being upright and virtual.

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When five vectors are added tail-to-tip and they end up where they started from, the magnitude and direction of R are zero.

What are vectors?

A vector is a quantity that has a magnitude (or length) and direction. It is typically represented by an arrow, with the length of the arrow representing the magnitude of the vector and the arrowhead indicating the direction in which the vector points. Vectors can be added or subtracted to create new vectors.

When vectors are added, they must be placed head-to-tail or tail-to-tip. In other words, the tail of one vector must be placed at the head of the previous vector to create a chain. The resulting vector is called the resultant vector and can be found by drawing a straight line from the tail of the first vector to the head of the final vector.

The magnitude of a vector is the length of the arrow that represents the vector. It is typically represented by the letter "R". So when five vectors are added tail-to-tip and they end up where they started from, the magnitude and direction of R are zero.

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The minimum angular velocity (in rpm) for swinging a bucket of water in a vertical circle without spilling any is 5.56 rpm.

The minimum angular velocity (in rpm) for swinging a bucket of water in a vertical circle without spilling any is given by the formula; Vmin=√g/R

where:

To express the answer in revolutions per minute, the radius of the circle must be converted to meters;R = 35 cm = 0.35 m

Substituting the values given above into the formula;

Therefore, the minimum angular velocity (in rpm) for swinging a bucket of water in a vertical circle without spilling any is 5.56 rpm.

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The power delivered by the person who applied a force of 10N to a box and pushed it 10 m in 10 s = 10 W

To determine the power delivered by the person who applied a force of 10N to a box and pushed it 10m in 10s can be determined by the formula,

P = W/t

Where

P denotes power,

W denotes work, and

t denotes time.

Therefore, power is given by the formula:

P = W/t = (F × s) / t

Here, F = 10 N (applied force)s

= 10 m (displacement)

t = 10 s (time taken)

Hence,

P = (10 N × 10 m) / 10 s

= 10N m / s

= 10 W

Therefore, the power delivered by the person who applied a force of 10N to a box and pushed it 10m in 10s is 10 W.

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The volume of the gas varies inversely with pressure, and the correct answer is (b) P/3.

According to Boyle's Law, at a constant temperature, the volume of a gas is inversely proportional to its pressure. Mathematically, this can be expressed as:

PV = k

where P is the pressure of the gas, V is its volume, and k is a constant.

If we assume that the mass of the gas remains constant, then k is also constant. So we can write:

[tex]P_1V_1 = k and P_2V_2 = k[/tex]

where[tex]P_1 and V_1[/tex] are the initial pressure and volume, and [tex]P_2 and V_2[/tex] are the final pressure and volume.

If we divide these two equations, we get:

[tex]P_1V_1/P_2V_2 = 1[/tex]

Since[tex]V_1[/tex] is inversely proportional to [tex]P_1[/tex], we can write:

[tex]V_1 = k/P_1[/tex]

Similarly, [tex]V_2 = k/P_2.[/tex]

Substituting these values in the above equation, we get:

[tex](k/P_1)/(k/P_2) = 1[/tex]

Simplifying this, we get:

[tex]P_2/P_1 = V_1/V_2[/tex]

Since we are given that the temperature remains constant, we can assume that k is constant, and therefore:

[tex]V_1/P_1 = V_2/P_2[/tex]

If we let [tex]P_2 = 3P_1[/tex], then we get:

[tex]V_1/P_1 = V_2/(3P_1)[/tex]

Simplifying this, we get:

[tex]V_1/V_2 = 1/3[/tex]

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According to the given figure, we can observe that a rod of length L with total charge Q is there. We need to find the expression for the electric field strength at point P on the axis of the rod at distance R from the center.

The electric field strength at point P on the axis of the rod at distance R from the center is given by:

[tex]E= KQ/(R^{2}+(L/2)^{2})^{3/2}[/tex]

Where, k is Coulomb's constant, Q is the total charge on the rod, L is the length of the rod, R is the distance between the point P and the center of the rod.

The derivation is given below.

Consider a thin rod with length L and total charge Q.

The linear charge density λ is given by:

λ = Q/L

Consider a small element of length dx at a distance x from the center of the rod. The electric field due to this small element is given by:

dE = kλdx/[tex]x^{2}[/tex]

Using Pythagoras theorem, we have:

[tex](R^{2}+(x-L/2)^{2} =z^{2}[/tex]

Thus, z = sqrt(R2+(x-L/2)2)

The electric field due to this small element is given by:

dE = kλdx/[tex]z^{3}[/tex]dE = kλdx/([tex]R^{2}[/tex]+[tex](x-L/2)^{2}[/tex])3/2

The total electric field is obtained by integrating the electric field due to all the small elements from -L/2 to L/2.

E =  ∫ dE from -L/2 to L/2

E = ∫kλdx/([tex]R^{2}[/tex]+[tex](x-L/2)^{2}[/tex])3/2 from -L/2 to L/2

E = kQ/[tex](R^{2} +(L/2)^{2})^{3/2}[/tex]

Therefore, the expression for the electric field strength at point P on the axis of the rod at distance R from the center is given by:

E = kQ/[tex]((R^2+(L/2)^2)^{3/2} )[/tex].

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The necessary speed with respect to the Earth for a rocket to escape if fired from the Earth at the equator in a direction eastward is 11.256 km/s. The necessary speed with respect to the Earth, for a rocket to escape if fired in a westward direction at the equator is 10.558 km/s.

The necessary speed, with respect to Earth, for a rocket to escape if fired from the Earth at the equator in a direction eastward will be

ve = 11.182 km/s

vr = 2πR/T

vr =2π(6,380 km)/(1 day)

vr = 464.7 m/s

vE= ve + vr = 11.182 km/s + 464.7 m/s = 11.256 km/s

The necessary speed with respect to Earth, for a rocket to escape if fired from the Earth at the equator in a direction eastward will be:

ve = 11.182 km/s

vr = 2πR/T

vr =2π(6,380 km)/(1 day)

vr = 464.7 m/s

vE = ve − vr = 11.182 km/s − 464.7 m/s

vE = 10.558 km/s

The necessary speed, with respect to Earth, for a rocket to escape if fired in a westward direction at 25° north latitude will be:

ve = 11.182 km/s

vr = 2πRcos(25°)/(1 day)

vr = 358.4 m/s

vE = ve − vr = 11.182 km/s − 358.4 m/s

vE = 10.599 km/s

The necessary speed, with respect to Earth, for a rocket to escape if fired from the Earth at the equator vertically upward is 11.182 km/s. Since the Earth is a sphere, any vertical movement will not cause the rocket to gain any additional speed with respect to Earth.

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The speed of an electron whose total energy is equal to the total energy of a proton that is at rest would be zero.

We can use the conservation of energy to solve this problem, where the total energy of the electron is equal to the total energy of the proton at rest. The total energy of a particle is given by the sum of its kinetic energy and rest energy (mass-energy), which is given by Einstein's famous equation, E=mc^2.

The rest energy of the electron and proton can be neglected compared to their kinetic energies, which are given by 1/2 mv^2, where m is the mass and v is the speed of the particle.

Since the total energy of the electron is equal to the total energy of the proton at rest, we can equate their kinetic energies:

1/2 me * ve^2 = 1/2 mp * 0^2

where me is the mass of the electron, mp is the mass of the proton, and ve is the speed of the electron.

Using the fact that the proton mass is about 1836 times the mass of the electron (mp/me = 1836), we can solve for the speed of the electron:

ve^2 = (mp/me) * 0^2 = 0

Therefore, ve = 0. The speed of the electron whose total energy is equal to the total energy of a proton at rest is zero, which means that the electron is not moving.

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The forces acting on the turtle and the cat when they are on the ground and not moving are balanced. Therefore, option 1 is the correct answer.

When the forces are balanced, the object is at rest or it will move at a constant speed in a straight line. In this case, both the turtle and the cat are on the ground and not moving. Therefore, the forces acting on both of them are balanced.

Unbalanced forces cause the object to accelerate or change direction. The magnitude and direction of the forces are not equal in unbalanced forces. Therefore, options 2, 3, and 4 are incorrect answers.

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The radius of the orbit of such a satellite will be about 1.40 × 10⁵ kilometers.

To calculate the radius of the orbit of a geosynchronous Earth satellite, we must use the equation:

r³T² = 1.01 × 10¹⁸ km³y²

where, r is the radius of the orbit and T is the orbital period of the satellite, which is 1 day. We can rearrange the equation to calculate r, giving us:

r = (1.01 × 10¹⁸km³y²)1/3/(1 day)2/3

To calculate the radius of the orbit, we need to convert the units of 1 day to seconds: 1 day = 86400 seconds. We can substitute this into the equation:

r = (1.01 × 10¹⁸km³y²)1/3/(86400 seconds)2/3

Finally, we can calculate the radius of the orbit: r = 1.40 × 10⁵ km

Therefore, the radius of the orbit will be about 1.40 × 10⁵ km.

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The frequency of NPR radio station is 8.87 x 107 Hz.

Frequency is the number of waves that pass a fixed point in a given amount of time. The unit of frequency is hertz (Hz).

The distance between two successive crests or troughs of a wave is known as wavelength. The unit of wavelength is meters.

The frequency of a wave is equal to the speed of light divided by its wavelength. In mathematical terms, it can be written as:

where

Given:

Wavelength of the signal = λ = 3.38 mSpeed of light = c = 3.0 x 108 m/sFrequency of the signal = ?

Formula:

Substitute the given values:

Therefore, the frequency of the NPR radio station is 8.87 x 107 Hz.

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The correct answer is B. Increasing the pressure on the lid of the cylinder to 1000 Pa increases the pressure of the water inside the cylinder by 1000 Pa.

According to the principle of Pascal, when there is an application of pressure at one point in an incompressible fluid, the pressure gets transmitted uniformly in all directions. This means that the pressure transmitted by the fluid at a point is equal to the pressure applied on it.

Therefore, in the given case, when the lid is pushed with a pressure of 1000 Pa, this pressure will be transmitted to the bottom of the cylinder uniformly. Hence, the pressure at the bottom of the cylinder will also increase by 1000 Pa.So, the water pressure at the bottom of the cylinder increases by 1000 Pa. This is because pressure is transmitted equally throughout the water in the cylinder, so increasing the pressure on the lid will increase the pressure at the bottom of the cylinder by the same amount.

Option B is the correct answer.

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The given statement "Small aperture phone aperture stop doubly-telecentric full control over the light collection uniform across the entire field of view. Furthermore it would allow resolution to be uniform across the same field of view" is False.

Aperture refers to the opening in a camera lens that regulates the amount of light that enters a camera. The camera aperture is determined by the size of the lens opening, which may be adjusted using a ring on the lens. The smaller the opening, the larger the f-number, which reduces the amount of light entering the camera.

Resolution refers to the ability of a lens to capture an image in detail. The resolution of an image is measured in pixels, and it is directly proportional to the number of pixels in the image. The resolution of an image is determined by the size of the camera sensor, the pixel density, and the quality of the lens.

Doubly telecentric lenses are those that have a telecentric entrance pupil, a telecentric exit pupil, or both. The telecentric entrance pupil implies that the aperture stop is located at the entrance pupil's location. The telecentric exit pupil implies that the pupil is located at the aperture stop's location. The doubly telecentric means that both the entrance and exit pupils are at the same location. As a result, the lens is able to provide sharp images with uniform resolution across the entire field of view.

The given statement, "Small aperture phone aperture stop doubly-telecentric full control over the light collection uniform across the entire field of view. Furthermore it would allow resolution to be uniform across the same field of view" is False.

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Answer:

periscope, an optical instrument used in land and sea warfare, submarine navigation, and elsewhere to enable an observer to see his surroundings while remaining under cover, behind armor, or submerged.

Explanation:

The closest answer among the options given is 3.9 x 105 J. . An object can accelerate by increasing its speed, changing its direction, or both.

What is Acceleration?
Acceleration is the rate of change of velocity of an object over time. It is a vector quantity, meaning it has both magnitude and direction, and is expressed in units of meters per second squared (m/s^2) or feet per second squared (ft/s^2)

The work done to accelerate the car can be calculated using the kinetic energy formula:

K = 1/2 mv^2

Substituting the given values, we get:

K = 1/2 (1600 kg) (22 m/s)^2

K = 677,600 J

Therefore, the work done to accelerate the car to this speed is 677,600 J.

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The main difference between a mission and a vision is that a mission defines a company's purpose, while a vision outlines its long-term goals.

The five characteristics of a vision are:

Inspiring: A vision should be inspiring and give people something to strive for. The primary difference between vision and mission is that the former defines the company's ultimate goal, whereas the latter outlines the company's strategic path to accomplishing that goal. A mission statement is a brief statement that summarizes an organization's core goal, competitive benefit, and guiding principles. It is a short, straightforward declaration of what a company intends to achieve in the long run.

A vision statement, on the other hand, is a forward-thinking declaration of where the company hopes to be in the future. It describes the company's aspirations and anticipations. In this answer, we will describe the five characteristics of a vision.

Five characteristics of a vision:

1. Clear and concise: A vision statement should be short, understandable, and to the point.

2. Realistic: It should be achievable while also being challenging.

3. Time-bound: It should have a timeframe within which it must be accomplished.

4. Flexible: It should be adaptable to shifting market dynamics, environmental conditions, or technological advancements.

5. Inspiring: It should motivate and engage staff, customers, and stakeholders.

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When a resistor is connected to a battery with a lower voltage, the amount of current flowing through it would decrease.

R is the resistance applied through the 6 volt cell. We obtain by replacing values. As a result, the potential difference across the 6V cell is 8.4 V. The voltage is the difference in potential between two sites in an electric field. In an electric field, the current is the movement of charges between two sites.

According to Ohm's Law

I = V/R

The current flowing through a 200 ohm resistor attached to a 12 V automotive battery is:

I = V/R

= 12 V / 200 ohms

= 0.06 A

Applying Ohm's Law once more, the new current would be:

I = V/R

= 6 V / 200 ohms

= 0.03 A

Therefore, When a resistor is connected to a battery with a lower voltage, the amount of current flowing through it would decrease.

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It will take approximately 1.67 seconds for the car to go from a speed of 20.0 m/s to a speed of 25.0 m/s if the acceleration is 3.0 m/s².

[tex]v = u + at[/tex]

Given:

u = 20.0 m/s (initial velocity)

v = 25.0 m/s (final velocity)

a = 3.0 m/s² (acceleration)

Rearranging the equation, we get:

[tex]t= \frac{(v - u)}{a}[/tex]

Substituting the given values:

t =  [tex]\frac{(25.0 m/s - 20.0 m/s)}{3.0 m/s^{2} }[/tex]

t = 1.67 s

Speed is the measure of the rate at which an object moves. It is defined as the distance an object travels per unit of time. Speed is a scalar quantity and is expressed in units of distance per unit of time, such as meters per second (m/s) or kilometers per hour (km/h). It is important to note that speed does not tell us anything about the direction of motion or any changes in direction. This is where velocity comes in, which is a vector quantity that includes both speed and direction.

Speed can be either average or instantaneous. Average speed is the total distance traveled divided by the total time taken, while instantaneous speed is the speed at a particular instant in time. Speed can also be described in terms of velocity, which includes direction as well as magnitude.

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"The relationship between the laser wavelength λ, the angle of the m th bright fringe, and the diffraction grating spacing d is d sinθ = m λ."

Waves overlap as they spread out between slits. Constructive interference occurs along anti-nodal lines. Bright fringes are seen where anti-nodal lines intersect the viewing screen.

Diffraction gratings can be used to split light into its constituent wavelengths (colours). Although the output light intensity is typically much lower, it generally provides greater wavelength separation than a prism.

The bright fringes that result from constructive interference of the light waves from various slits are found at the same angles when light meets an entire array of identical, evenly spaced slits, known as a diffraction grating, as opposed to when there are only two slits. But the pattern is a lot more defined.

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In a three battery combination whose second resistor is opposite in polarity of the other two, the Σε and Σr are 24 V and 14 Ω respectively.

Begin by finding the equivalent voltage and resistance of the circuit:

Since ε₂ is in the opposite direction, subtract it from the other two voltages:

∑ε = ε₁ + ε₃ - ε₂ = 12 V + 18 V - 6 V = 24 V

To find the equivalent resistance, first combine the 6 Ω and 12 Ω resistors in parallel:

1/Rp = 1/6 Ω + 1/12 Ω = 1/4 Ω

Rp = 4 Ω

Then combine the 4 Ω resistor in series with the 10 Ω resistor:

R = 4 Ω + 10 Ω = 14 Ω

Therefore, ∑ε = 24 V and ∑r = 14 Ω.

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We know that Fg = mg = 4.5 kg * 9.8 m/s² = 44.1 NTherefore, F(t) = F_net + Fg = 1.5525 N + 44.1 N = 45.6525 NThe magnitude of the force F when t = 3.60 s is 45.65 N.Given,The mass of the crate, m = 4.5 kgHeight of the crate above its initial position, y(t) = (2.80m/s )t + (0.61m/s³)t³Let F(t) be the force applied upward on the rope.The upward force F(t) acting on the crate = Weight of the crate - Tension in the ropeTension in the rope is because of the force applied upward.

Therefore,Tension in the rope, T = F(t) - mgWhere g is the acceleration due to gravity= 9.8 m/s²Let's differentiate the given height of the crate equation to obtain the velocity of the crate above its initial position, dy(t)/dt.dy(t)/dt = (2.80m/s) + 3(0.61m/s³)t²We can determine the velocity of the crate at t= 3.60s by substituting the value of t = 3.60s. dy(3.60s)/dt = (2.80m/s) + 3(0.61m/s³)(3.60s)² = 16.34 m/sFrom the equation of motion, v² = u² + 2asWhere v is the final velocity, u is the initial velocity, a is the acceleration, and s is the distance.The initial velocity, u = 0m/s.The distance traveled by the crate when the force is applied, s = (2.80m/s)t + (0.61m/s³)t³ = (2.80m/s)(3.60s) + (0.61m/s³)(3.60s)³ = 23.63 mThe acceleration, a = (v² - u²)/2s = (16.34m/s²)/47.26m = 0.345 m/s²The net force, F_net = maWhere m is the mass of the crate and a is the acceleration of the crate due to the applied force F(t).F_net = m * a = 4.5kg * 0.345m/s² = 1.5525 NThe net force F_net is the sum of the force applied upward F(t) and the weight of the crate Fg, F_net = F(t) - FgWe know that Fg = mg = 4.5 kg * 9.8 m/s² = 44.1 NTherefore, F(t) = F_net + Fg = 1.5525 N + 44.1 N = 45.6525 NThe magnitude of the force F when t = 3.60 s is 45.65 N.

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The work done on the block by friction during the motion of the block from point A to point B is 2.49 J.

The normal force acting on the block at point A and point B is different. We can find the weight of the block at points A and point B using the following formula:

Weight = mg,

where m is the mass of the block and g is the acceleration due to gravity.

Weight at point A = m × g

Weight at point B = m × g

Now, the normal force acting on the block at point A is given as 3.95 N.

Therefore, we can write the equation for the weight and normal force as:

Weight at point A - Normal force at point A = m × a

Now, at point A, the acceleration acting on the block is the centripetal acceleration a = v²/R where v is the velocity of the block at point A.

We can write the equation for the weight and normal force as:

m × g - 3.95 = m × v²/R

Similarly, at point B, we can write the equation for the weight and normal force as:

m × g - 0.680 = m × v²/R

Now, we can solve both the equations for the velocity of the block at point A and point B:

Velocity at point A, v₁ = √(gR - 3.95/m)

Velocity at point B, v₂ = √(gR - 0.680/m)

The change in kinetic energy during the motion from point A to point B is given by:

∆KE = KE₂ - KE₁

= (1/2)mv₂² - (1/2)mv₁²

We know that work done, W = ∆KE

So, the work done on the block by friction during the motion of the block from point A to point B is given by:

W = (1/2)m(v₂² - v₁²)

Substituting the values in the above equation:

W = (1/2) × 0.0400 × ((√(9.81 × 0.500 - 0.680/0.0400))² - (√(9.81 × 0.500 - 3.95/0.0400))²)

W = 2.49 J

Therefore, the work done on the block by friction is 2.49 J.

Learn more about Friction here:

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Answer: Energy is the ability to do work.

Joules is what energy is measured in.

Kinetic energy is the energy which a body possesses by virtue of being in motion.

Potential energy is the energy held by an object because of its position relative to other objects, stresses, within itself, its electric charge, or other factors.

Explanation: