21.42 using cyclopentanone as your starting material and using any other reagents of your choice, propose an efficient synthesis for each of the following compounds

Answer:

Explanation:

Given parameters

initial velocity u = 4.9m/s

height of drop H = 100m

acceleration due to gravity g = -9.8m/s²(since the body is ascending i.e moving against gravity)

Required

time taken by the packet to reach the ground 't'

Using the equation of motion

S = ut+1/2gt²

0-100 = 4.9t+1/2(-9.8)t²

-100 = 4.9t-1/2(9.8)t²

-100 = 4.9t-4.9t²

4.9t-4.9t² +100 = 0

4.9t²-4.9t² -100 = 0

Multiplying through by 10

49t²-49t-1000 = 0

Using the general equation t = (-b±√b²-4ac)/2a

t = -(-49)±√(-49)²-4(49)(-1000)/2(49)

t = 49±√(2401+196000)/2(49)

t = 49±√(198401)/98

t = 49±√(198401)/98

t = 49±449.42/98

t = (49+449.42)/98

t = 494.42/98

t = 5.04secs

Hence, it took the packet 5.04secs to reach the ground

The final velocity is calculated using the formula v = u + at

v = u-gt

v = 4.9-(9.8)(5.04)

v = 4.9-49.392

v = -44.492m/s

This shows that the final velocity is 44.49m/s(moving downwards)

False.

Galaxies do not look the same when viewed in visible or X-ray wavelengths. The electromagnetic spectrum consists of various wavelengths, including visible light and X-rays, each carrying different types of information about celestial objects.

When observing galaxies in visible light, we primarily see the light emitted by stars within the galaxies. This provides information about the distribution of stars, their colors, and the overall structure of the galaxy. Visible light observations are commonly used to study the morphology and stellar populations of galaxies.

On the other hand, X-ray observations reveal a different aspect of galaxies. X-rays are produced by extremely energetic processes, such as accretion onto black holes, supernova remnants, and hot gas in galaxy clusters. By observing galaxies in X-ray wavelengths, we can study active galactic nuclei, high-energy phenomena, and hot gas properties within galaxies and galaxy clusters.

Visible light observations provide insights into the stellar content and structure of galaxies, while X-ray observations give us information about the energetic processes and hot gas within galaxies. Therefore, galaxies can appear different when viewed in visible or X-ray wavelengths.

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Answer: stationary front

Explanation:

Answer:

anything stationary

Explanation:

anything that is not moving outside the train like passing trees or the train's station is considered to be a frame reference.

Answer:gravitational, weak nuclear, electromagnetic, strong

Explanation:

The correct answer of terrestial weather:

The solar insolation in the visible and infrared regions of the solar electromagnetic spectrum is much more than the energy that space weather occurrences release into the troposphere and stratosphere. Despite claims to the contrary, there may be some connection between the Earth's climate and the 11-year sunspot cycle. There is no proof of this. For instance, it has frequently been suggested that the Maunder minimum, a 70-year period almost devoid of sunspots, is correlated to a cooler climate, but these correlations have vanished after further research. Changes in cosmic ray flux are hypothesized to affect how much cloud formation occurs.

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The correct option provided is option C) 5.7 m/s^2

When the rope is holding the rock, the tension force in the rope opposes the weight of the rock and the net force acting on the rock is zero. When the rope breaks, the tension force becomes zero and the weight of the rock is the only force acting on it.

The weight of the rock can be resolved into two components, one parallel to the inclined plane and one perpendicular to it. The component parallel to the inclined plane will cause the rock to accelerate down the plane.

The magnitude of the component of the weight parallel to the inclined plane is given by Wsinθ, where W is the weight of the rock and θ is the angle of the inclined plane with respect to the horizontal.

a = (Wsinθ)/m

where m is the mass of the rock.

Substituting the values, we get:

a = (10 kg) * sin(30°)/10 kg = 5 m/s^2

Therefore, the magnitude of the acceleration of the rock down the inclined plane if the rope breaks is 5 m/s^2.

The closest option provided is option C) 5.7 m/s^2.

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Answer:

The correct option is;

D. There is not enough information to answer this question

Explanation:

The universal gravitational constant = 6.67408 × 10⁻¹¹ 3³/(kg·s²)

For an in between distance of 1 m and equal masses of 60 kg, we have;

\(F = G \times \dfrac{m_{1} \times m_{2}}{r^{2}} = 6.67408 \times 10^{-11} \times \dfrac{60 \times 60}{1^{2}} \approx 2.403 \times 10^{-7} N\)

The gravitational attraction ≈ 2.403 × 10⁻⁷ N, which does not correspond with the answers, therefore, the best option is that there is not enough information to answer this question.

Answer:

29.7 m/s fast, velocity is 29.7 m/s

Explanation:

Applying,

v² = u²+2gs...................... Equation 1

Where v = final velocity, u = initial velocity, g = acceleration due to gravity, s = distance.

Given: u = 0 m/s (dropped from height), s = 45 m

Constant: g = 9.8 m/s²

Substitute these values into equation 1

v² = 0²+2×9.8×45

v² = 882

v = √(882)

v = 29.7 m/s.

Hence the stone will be moving 29.7 m/s fast and the velocity is also 29.7 m/s

The correct answer is (b) 60 J. A system does 80 j of work on its surroundings and releases 20 j of heat into its surroundings. The change of energy of the system 60 J

To determine the change in energy of the system, we can use the equation:

ΔU = q - w

where ΔU represents the change in energy of the system, q represents the heat transferred to the surroundings, and w represents the work done by the system on the surroundings.

Given that q = -20 J (since heat is released into the surroundings) and w = -80 J (since work is done by the system on the surroundings), we can substitute these values into the equation:

ΔU = -20 J - (-80 J)

    = -20 J + 80 J

    = 60 J

Therefore, the change in energy of the system is 60 J.

Understanding the principles of energy transfer and the calculation of changes in energy is crucial in thermodynamics. In this particular scenario, the change in energy of the system is determined by considering the heat transferred and the work done on or by the system.

By applying the equation ΔU = q - w, we can calculate the change in energy. In this case, the system releases 20 J of heat into its surroundings and does 80 J of work on the surroundings, resulting in a change of energy of 60 J. This knowledge enables us to analyze and interpret energy transformations and interactions within a given system, leading to a better understanding of various physical and chemical processes.

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The correct match of the descriptions to the below people are 23 - F, 24 - H, 25 - D, 26 - I, 27 - A, 28 - B.

23 - F Galileo: Galileo Galilei is credited with discovering the phases of Venus using a telescope. Through his observations, he observed that Venus went through a series of phases similar to those of the Moon, which supported the heliocentric model of the solar system.

24 - H Kepler: Johannes Kepler was the first to consider ellipses as orbits. He formulated the laws of planetary motion, known as Kepler's laws, which stated that planets move in elliptical paths with the Sun at one of the foci. Kepler's work revolutionized our understanding of celestial mechanics.

25 - D Aristotle: Aristotle, the ancient Greek philosopher, is considered one of the foremost thinkers in history. While his contributions span various fields, including philosophy and natural sciences, his views on astronomy were geocentric. He believed that the Earth was the center of the universe and that celestial bodies moved in perfect circles around it.

26 - I Nicolaus Copernicus: Nicolaus Copernicus was an astronomer who proposed the heliocentric model of the solar system, in which the Sun, rather than the Earth, was at the center. Copernicus's revolutionary idea challenged the prevailing geocentric view and laid the foundation for modern astronomy.

27 - A Eratosthenes: Eratosthenes was an ancient Greek mathematician and astronomer who made significant contributions to geography and astronomy. He is known for his accurate measurement of the Earth's circumference. By measuring the angle of the Sun's rays at two different locations, he estimated the Earth's circumference with remarkable accuracy.

28 - B Aristarchus: Aristarchus of Samos is credited with developing the first predictive model of the solar system. He proposed a heliocentric model centuries before Copernicus, suggesting that the Sun was at the center of the universe, with the Earth and other planets orbiting it. Aristarchus's model was a significant departure from the prevalent geocentric view of the time.

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Answer:

credits to the real owner of the answer I just found it here

Buying or selling the Earth will go against the rights of the inhabitants of the world (humans and other living beings).

Solar influence

The relation to determine Roche limit is:

\(Roche Limit=(2.423) (Rp3) {{\sqrt[3]{\frac{D_{P} }{D_{m} } } } }\)

Here  is radius of planet and  are density of planet and moon respectively.

According to the problem,

Density of Earth, = 5.5 g/cm³

Density of Moon, = 3.34 g/cm³

Consider  be the radius of the Earth.

Substitute the suitable values in the equation (1).

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Answer:

i don't really know but i think yes sorry if it is wrong

Answer:

59F

Explanation:

Given parameters:

Temperature in °C  = 15°C

Unknown:

Temperature in Fahrenheit scale  = ?

Solution:

To solve this, we use the conversion equation below;

       F  = (C x 1.8)  + 32

C is the temperature in celcius;

    F = (15 x 1.8) + 32  = 59F

Answer:

Explanation:

acceleration is rate of change of velocity

a=dv/dt =d/dt(4t^2+t) = 8t+1

Acceleration t=2 sec, =8(2)+1=17 m/s^2

Force = mass * acceleration = 5*17 = 85N

Answer:

ITS MULTI Rust

Explanation:

Answer:it is compound,and coumpound

Explanation:

During exercise, the major mechanism of heat loss is evaporation of sweat from the skin. Sweat evaporation is a thermoregulatory process that allows humans to maintain a relatively constant internal body temperature when engaging in exercise.

As a result of exercise, metabolic heat is generated. When the internal temperature rises, thermoreceptors in the hypothalamus are activated, causing sweat glands to be stimulated through sympathetic nerve fibers.The sweat produced then evaporates off the skin and removes the heat generated by exercise, thus cooling the body. However, sweat evaporation is only effective in removing heat if the ambient temperature is lower than the skin temperature. If the ambient temperature is higher than the skin temperature, then sweat cannot evaporate, and heat will not be removed from the body. Other mechanisms of heat loss, such as conduction, convection, and radiation, are less important than sweat evaporation during exercise.

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The conventional steel vehicle (CV) uses 39,336 gallons of gasoline per year, resulting in an annual energy consumption of 100,000 MBTU. The CV's total life cycle energy use is 115,000  MBTU.

Annual gasoline use for CV:

CV's annual gasoline use = (12,000 miles/year) / (33 miles/gallon) = 364 gallons.

Energy consumption during operation (Ed) for CV:

CV's annual energy consumption during operation = (364 gallons/year) × (114,000 BTU/gallon) = 41,496,000 BTU.

Converting to MBTU: CV Ed = 41,496,000 BTU / 1,000,000 = 41.496 MBTU.

Life cycle energy use (Eiot) for CV:

CV's life cycle energy use = (CV's annual energy consumption during operation) + (energy required to produce CV) = CV Ed + (100 million BTU).

Converting to MBTU: CV Eiot = CV Ed + (100 million BTU / 1,000,000) = 41.496 MBTU + 100,000 MBTU = 100,041.496 MBTU.

Rounding to 3 significant figures: CV Eiot = 100,000 MBTU.

End of life energy consumption (Eic) for CV:

Given that the end-of-life energy consumption for CV is 15% higher than AIV, we can calculate Eic for AIV first. Let's denote AIV's Eic as X.

X = CV Eiot × 1.15 = 100,000 MBTU × 1.15 = 115,000 MBTU.

Thus, CV's Eic = 115,000 MBTU.

Therefore, the answers are:

CV Eiot = 100,000 MBTU (CV's life cycle energy use).

AIV Eiot = 100,041.496 MBTU (AIV's life cycle energy use).

Since the CV has a lower end-of-life energy consumption (Eic) compared to AIV, the CV would have a lower life-cycle energy use.

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Answer:

In a closed system, the total energy is conserved or remains the same as energy transformations take place.

Explanation:

The law of conservation of energy states that energy cannot be created or destroyed but can be transformed from one form to another.

This law of conservation of energy applies only to a closed system. A closed system is a system which does not exchange energy with its surroundings. All forms of energy conversions occurring within a closed system does not result in an increase or decrease of the total energy of the system, rather, energy remains constant. For example, the universe is a closed system in that all forms of energy conversions occurs within it and energy is not exchanged with an external environment. However, the earth is not a closed system as some of the energy it receives from the sun can be radiated out into space. Since it's an open system, its total energy can change.

The total energy of a closed system as energy conversion takes place

remains constant.

A closed system is the system which doesn't permit any movement of matter

in and out of the system. The closed system doesn't allow the exchange of

energy with its environment.

Since energy exchange isn't permitted in the closed system, the energy

remains constant during energy conversion.

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Answer:

Explanation:

To understand this, we need to reflect back to the law of motion, the first law to be précised.

It states that "A body will continue to be at rest or uniform/constant motion unless acted upon by an external force which is greater than the current force"  

So we can see that since the person continues to apply the same force at the same speed, the effect on the mover will be the same.

Answer:

umm im confused

Explanation:

Answer:

larger mass more the molecule more heat absorbed

and vice versa .Thats the reason ok?

Radiative energy is the energy carried by light.

What is radiative energy?

Radiative energy is the energy carried by light. It is a form of energy that can be transmitted through space without requiring a medium for it to move through. Radiative energy can come from natural sources like the sun or artificial sources like light bulbs.

Radiative energy is important for a variety of reasons. For one thing, it is the primary source of energy for many living organisms on Earth, particularly plants. Energy from the sun helps plants photosynthesize and produce food that they can use to grow and reproduce.

Radiative energy is also important for human life. It is used in a variety of ways, including in the form of light for illuminating spaces and in the form of heat for cooking and keeping warm. Understanding the nature and properties of radiative energy is important for a wide range of scientific and technological fields.

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Answer:

Non metal and nonmetal

Explanation:

Covalent bonds are formed between non-metal and non-metal

Hope this helps...

Answer:

20 per second

Explanation:

80/4

20

The hummingbird beats its wing 20 times per second!

Have an amazing day!!

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An electromagnet is made when when current is passed through a coil of

wire wrapped around an iron nail. The nail becomes magnetic and able to

pick up metallic objects.

The principle can be used to create an electric motor motor by forming a

current carrying coil into which is attached a movable core that is attached

to a spring.

Based on the arrangement, when a current flows in the coil, the movable

core, known as the armature, is pulled into the the coil and when the

current is switched off the spring pushes the armature out again.

The mechanical energy of the motion of the armature can be used to put

switches on or off, and to open and close valves.

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Answer:

It depends on the values of A and B vectors and angle between them. then angle between vectors A+B and A -B is 90°.

Explanation: