5) calculate the frequency of oscillation for a 3 meter long simple pendulum swinging on the moon. calculate the frequency of oscillation for a 3 meter long simple pendulum swinging on the surface of a white dwarf star the size of the earth but equal to 1 solar mass.

Answer:

See the explanation.

Explanation:

Q9. Irregular reflection happens when a set of parallel beams are reflected from non-smooth surface which results in non-parallel reflected beams.

Q10.

i) Periscope

ii) There are different types of periscopes but the main characteristic of this instrument is observation over the obstacles or in general objects that are not in the line-of-sight. Basic Periscope uses parallel angled mirrors to project objects that are above the surface in submarines.

The Kelvin scale is known as the absolute scale. The lowest temperature in Kelvin is the temperature 0 (there is no negative temperature in Kelvin).

The conversion from Kelvin to Fahrenheit is given by the formula below:

Using K = 0 in this formula, we have:

So the lowest temperature in Fahrenheit is -459.67 °F.

Answer: some may argue that while teacher’s only provide service to a single classroom, superstar athletes are entertaining fans all around the world, enticing people with a feeling of relaxation and excitement. Obviously, what these individuals must not be aware of is the most important man in our nation, the president, who makes critical decisions that affect the entire world every day, only makes $400,000 a year. While President Obama is hard at work reviving the economy, the unproven rookie in the MLB is earning way over that figure. Furthermore, police officers, firefighters, and doctors save lives while risking their own for a fraction of what sports stars make. People in the military leave their families at home to defend and protect the country knowing they may never return. It's truly a pity that none of these true heroes are given the same recognition by society as athletes such as Brett Favre or Michael Jordan are given. While I do understand that making it into the pros is not an easy thing to do, and that it takes a tremendous number of hours of hard work and dedication every day to earn a job in professional sports, these people do nothing more than entertain the general public.

Explanation:

Answer:

Wouldn't it be great to make nearly $111 million a year simply to play a game? Tiger Woods, along with many other professional athletes, certainly think so. But do these athletes really deserve all that money?

In my mind, absolutely not. Professional athletes are making too much money in a society where salaries and wages are traditionally based on the value of one's work. In today's society, one should be paid according to the job’s economic importance and their value to society.

Teaching is one of the most economically important occupations because our future economy relies on the education of its youth, yet teachers are paid astronomically less than the average professional athlete is. In fact, each basket Kobe Bryant scores earns him equivalent to the average classroom teacher’s yearly salary.

However, some may argue that while teacher’s only provide service to a single classroom, superstar athletes are entertaining fans all around the world, enticing people with a feeling of relaxation and excitement.

Obviously, what these individuals must not be aware of is the most important man in our nation, the president, who makes critical decisions that affect the entire world every day, only makes $400,000 a year. While President Obama is hard at work reviving the economy, the unproven rookie in the MLB is earning way over that figure.

Furthermore, police officers, firefighters, and doctors save lives while risking their own for a fraction of what sports stars make. People in the military leave their families at home to defend and protect the country knowing they may never return. It's truly a pity that none of these true heroes are given the same recognition by society as athletes such as Brett Favre or Michael Jordan are given.

While I do understand that making it into the pros is not an easy thing to do, and that it takes a tremendous number of hours of hard work and dedication every day to earn a job in professional sports, these people do nothing more than entertain the general public.

Moreover, in my mind, if these athletes want to continue to be rewarded with the fame and fortune that is unfairly bestowed upon them, they must prove to the world that they are going to be positive role models for future athletes, and those who admire them.

Explanation:

found if off some website lol hope it helps! <3

Answer:

27.4

Explanation:

(13+43+12+3+66)/5

137/5

27.4

Answer:

27.4 because you add them all together and divide the number you get by 5

Answer:

40 J

Explanation:

The correct answer is A. When a girl stands on a weighing scale, she exerts a downward force on the scale due to her weight. the support force acting on the girl is 200 N, which matches her weight.

According to Newton's third law, the scale exerts an equal and opposite upward force on the girl, known as the support force. This support force counterbalances the weight of the girl and prevents her from falling through the scale. Therefore, the support force acting on the girl is equal to her weight, which is 200 N. It's important to note that the support force is not the same as the girl's weight. Weight is the force with which an object is attracted towards the center of the earth, whereas the support force is the force exerted by the scale to counterbalance the weight. This distinction is important to understand in physics problems involving forces and motion.

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complete question:

How much support force acts on a 200-N girl standing on a weighing scale?

A. 200 N

B. No support force unless she stands on the floor

C. More than 200 N

D. Less than 200 N

Answer:

3.6 N

Explanation:

The magnitude of centripetal force in this case is equal to the magnitude of tension in the spring.

The formula is :

T= mv²/r ------where T is tension

m= mass of object =0.8 kg

v= velocity of object {tangential velocity} = 3.0 m/s

r= length of string = 2m

Applying the formula with real values;

T= mv²/r

T= {0.8 * 3²} / 2

T= { 7.2}/2 = 3.6 N

One repetition of a metrical pattern is called a "foot." In poetry and prosody, a foot is the basic unit of measurement for meter, which is the rhythmic structure of a verse.

Repetition of a metrical pattern refers to the recurrence of a specific rhythmic structure or pattern in a poem or verse. In poetry, meter is a systematic arrangement of stressed and unstressed syllables that creates a rhythmic pattern. When a metrical pattern is repeated consistently throughout a poem, it helps establish a sense of rhythm and musicality.

Repetition of a metrical pattern serves several purposes in poetry. It helps create a musical quality, enhances the poem's flow, and establishes a predictable structure that can engage the reader or listener. Poets often use metrical patterns as a tool for conveying meaning, emphasizing certain words or ideas, or evoking specific emotions.

A foot typically consists of one stressed syllable and one or more unstressed syllables. Different types of feet include the iamb (an unstressed syllable followed by a stressed syllable, as in the word "about"), the trochee (a stressed syllable followed by an unstressed syllable, as in the word "happy"), the anapest (two unstressed syllables followed by a stressed syllable, as in the word "understand"), and the dactyl (a stressed syllable followed by two unstressed syllables, as in the word "elephant").

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Answer:

The DNA molecule is a polymer of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-person sugar (deoxyribose), and a phosphate group There are four nitrogenous bases in DNA, two purines (adenine and guanine) and two pyrimidines (cytosine and thymine). A DNA molecule is composed of two strands.

Answer:

C

Explanation:

Answer:

A)  

Explanation:

Inside your CD player, there is a miniature laser beam called a semiconductor diode laser and a small photoelectric cell an electronic light detector. The laser flashes up onto the shiny side of the CD, bouncing off the pattern of pits  and lands  on the disc.

Answer:

Heat???

Sorry I am not at all sure

The energy emitted per minute by the blackbody at the given area is 170,724.8 J/min.

The energy emitted per minute at the given area is calculated as follows;

P = σAT⁴

P = (5.67 x 10⁻⁸) x (2) (398)⁴

P = 2845.41 W = 2845.41 J/s

Convert energy emitted per second to per minutes

P = 2845.41 J/s x (60 s / min) = 170,724.8 J/min

Thus, the energy emitted per minute by the blackbody at the given area is 170,724.8 J/min.

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Answer:

50% of source A, and 25% of source B.

Explanation:

You see, half-life of 10mil years means half of it will be gone in 10 million years. so basically, since source a is 10mil half life, half of it will remain, while source b, since it has 5 million years of half life, will have 25% left, since 1/2*1/2=1/4. hope this helps!

Answer:

source A 50%

source B 25%

Explanation:

Half life is time it takes for something to get reduced by half. For example, if half life of my weight is 5 years and I am currently 20lbs, then in next 5 years I will become half of my original so 10lbs.

Similarly, if compound A has half-life of 10 million years, then after 10 million years, half of compound A will remain, thus 50% remains

Compound b has half life of 5 million years, so first 5 million years it will reduce by half so become 50% but then in another 5 million years (total of 10 million years) it gets reduced by another half so 50/2 = 25% remains.

Answer: It has fewer decibels.

Explanation:

In a sound-wave, the intensity is defined as the power carried by the wave. The decibel is a measure of the ratio between two quantities. And in acoustics is used as the unit of the sound pressure level, which is related to the intensity of the wave, then:

As the intensity increases, we also should notice an increase in the decibels.

How is a less-intense wave different from a more-intense wave?

The less-intense wave has fewer decibels.

Answer:

It has fewer decibels.

Explanation:

Answer:

It means it is the main building block material for society.

Specific heat is the amount of heat energy that causes a unit increase in temperature by required to be added to the unit mass of the substance. It can be measured by the heat capacity of a particular substance. The unit of specific heat is joule/kg/kelvin.

Material Specific heat capacity Thermal conductivity

Clay                1000                                       0.60

stone              1000                                      1.8

brick               800                                       0.73

concrete        1000                                       1.13

Advice on what this means for society:

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In the context of thermodynamics, a control volume refers to an arbitrary region in space used to analyze the flow and energy transfer within a system. The condenser is a component commonly found in thermal systems, such as refrigeration or power plants, where it is responsible for transferring heat from a working fluid to a cooling medium.

When considering the energy balance for the control volume enclosing the condenser, several factors come into play. The energy balance equation for this scenario focuses on the energy input and output within the control volume. In the case of the condenser, the energy balance equation can be simplified because the condenser typically operates at a nearly constant pressure. This simplification allows us to neglect the changes in kinetic and potential energy terms.The energy balance equation for the condenser reduces to a simpler form where the energy input is equal to the energy output. This means that the heat absorbed by the condenser from the working fluid, which is usually in the form of latent heat, is equal to the heat rejected by the condenser to the cooling medium.

This simplified energy balance equation helps us analyze and optimize the performance of the condenser in terms of heat transfer efficiency and thermal management within the system. In summary, for the control volume enclosing the condenser, the energy balance reduces to a simplified equation where the energy input is equal to the energy output, considering the nearly constant pressure operation. This simplification allows for a focused analysis of the heat transfer processes occurring within the condenser.

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The pressure at a point in a fluid depends on its weight.

Weight is the product of mass of the object and the acceleration due to gravity.

Fluid pressure is the pressure at a point inside a fluid due to the weight of the fluid.

The pressure in liquids can be calculated using the following relationship,

\(P_{fluid}\) = P + ρgh

where,

\(P_{fluid}\) = pressure at a point in the fluid

P = pressure at reference point

ρ = Density of liquid

g = gravitational acceleration (relative to the ground g = 9.8 m/s)

h = Height from reference point

Two factors affect fluid pressure.

These two elements are the depth and density of the fluid.

Therefore the fluid pressure depends on the weight at a point.

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The broken pieces of the plates overlie a ductile layer known as asthenosphere.

Plate tectonics is a scientific hypothesis that explains the movement of Earth's lithosphere. Plate tectonics also explains the formation of mountains, volcanoes, and the occurrence of earthquakes. The Earth's lithosphere is composed of the Earth's crust, both continental and oceanic, and the uppermost part of the mantle. The lithosphere is divided into several plates that fit together like a puzzle. These plates are in constant motion, driven by the motion of molten rock in the Earth's mantle.

The plate boundaries can interact with one another in various ways. Divergent plate boundaries are where new lithosphere is created as the plates move apart. At convergent plate boundaries, one plate is forced beneath another. Transform plate boundaries are where plates slide past each other in a sideways movement.

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Answer:

54 Km per hour..

Explanation:

Multiply the speed value by 3.6

When both foci of an ellipse coincide at the same position, the eccentricity of the ellipse is 0, and it becomes a circle. The answer is (c) 0.

When both foci of an ellipse are located at exactly the same position, the eccentricity of the ellipse must be 0. An ellipse is a set of points whose distance from two fixed points (foci) sum to a fixed value. The distance between the foci is the major axis length, and the distance between the vertices is the minor axis length. The formula for an ellipse is (x−h)2/a2+(y−k)2/b2=1.

The distance between the foci is 2c, which is always less than the length of the major axis. The relationship between the semi-major axis a and semi-minor axis b of an ellipse is given by a2−b2=c2. An ellipse's eccentricity is defined as the ratio of the distance between the foci to the length of the major axis, with e=c/a. When the two foci coincide at the same position, the eccentricity of the ellipse is 0, and the ellipse becomes a circle.

The answer is (c) 0.

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The pressure at the bottom of the column is determined as 94,080 Pa.

The hydrostatic pressure of the water column is pressure exerted due to the vertical column of water and it can be calculated by applying the following formula.

Mathematically, hydrostatic pressure is given as;

P = ρgh

where;

The given parameters include the following;

Substitute the above parameters and solve for the pressure exerted by the water column.

P = 1000 x 9.8 x 9.6

P = 94,080 Pa

Thus, the pressure exerted by the column of the water depends on the depth of the water or water column.

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The given statement "The seasonal polar caps on Mars, which grow and shrink over the year, are primarily carbon dioxide." is True. The seasonal polar caps on Mars primarily consist of carbon dioxide.

The seasonal polar caps on Mars are primarily made up of carbon dioxide, also known as dry ice. During the Martian winter, the carbon dioxide freezes out of the atmosphere and forms a layer of ice on the polar caps. As the planet moves closer to the sun in the spring and summer, the ice begins to sublimate, or turn directly from a solid to a gas, and the polar caps shrink in size.

The process is reversed during the fall and winter as the planet moves farther from the sun and the carbon dioxide freezes out of the atmosphere once again. These seasonal changes in the polar caps have been studied extensively by spacecraft orbiting Mars and provide important information about the planet's climate and geology.

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Precision refers to the closeness of two or more measurements to each other. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise. Precision is independent of accuracy.

Answer:

The sky is the region in which sunlight is scattered in the Earth's atmosphere,

while space is everything beyond that.

The soil can be assessed for salinity by measuring the electrical conductivity (EC) of the soil solution.To determine if the soil is sodic, the sodium adsorption ratio (SAR) can be calculated using the ion concentrations in the soil solution.

To assess if the soil is saline, the electrical conductivity (EC) of the soil solution is measured. High EC values indicate the presence of dissolved salts, which can negatively impact plant growth. A threshold value of 4 dS/m is commonly used to determine if the soil is saline.

To determine if the soil is sodic, the sodium adsorption ratio (SAR) is calculated using the ion concentrations in the soil solution, typically reported in millimoles per liter (mmol/L). SAR is an indicator of the relative amount of sodium to other cations in the soil. If the SAR value exceeds 13, the soil is considered sodic, indicating a potential risk of soil dispersion and reduced soil structure stability.

The concern between plants and soil depends on the specific situation and the needs of the plants. If the soil is determined to be saline, plants may face challenges in water uptake due to osmotic stress. The high salt concentration can disrupt the osmotic balance, reducing the availability of water to the plant roots. In this case, the concern would be more focused on the plants' ability to thrive and sustain growth.

If the soil is determined to be sodic, it indicates an elevated level of sodium, which can lead to issues with soil structure and drainage. Excessive sodium can cause soil particles to disperse, resulting in poor soil aggregation and reduced permeability.

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Using the Standard population for region, the proportionate mortality for old people in region Y is 80%. The correct answer is option  (c).

To calculate the proportionate mortality, we need to determine the number of deaths among old people in region Y and divide it by the standard population for region Y.

According to the given options, option c is the correct answer, which states that the proportionate mortality is 48/60 = 80%.

This means that out of the standard population of 60 in region Y, 48 deaths occurred among old people. This indicates a high proportionate mortality rate for the elderly population in region Y, reflecting the impact on that age group's mortality in the region.

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Answer:

Vx=15.3*cos65°=6.47m/s

Explanation:

Vx=15.3*cos65°=6.47m/s

Vy=15.3*sin65°=13.87m/s

Answer:

187.5 m/s (i think)

Explanation:

If you use the formula V= T times displacement you can find this out by doing the following-

Displacement equals 75 m

T equals 2.5 hrs

75x2.5= 187.5

and since velocity is measured in m/s, it becomes

187.5 m/s

The mechanical advantage of a second class lever compares to the mechanical advantage of a third class lever is generally greater than the mechanical advantage of a third class lever.

In a second class lever, the load is located between the fulcrum and the effort, which means that the effort arm is longer than the load arm. This results in a mechanical advantage that is greater than one, meaning that the effort required to move the load is less than the weight of the load itself.

In contrast, in a third class lever, the effort is located between the fulcrum and the load, which means that the load arm is longer than the effort arm. This results in a mechanical advantage that is less than one, meaning that the effort required to move the load is greater than the weight of the load itself. However, third class levers are still useful in situations where a greater range of motion or speed is required.

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