Answer:
less than the water
Explanation:
Since the volume of ice grows while it develops, it has a lower density than water since water's mass doesn't change during the cooling and freezing process.
What is density of an ice cube?Ice has a density that is around 90% that of water, however this might change since ice can also include air.
Accordingly, only 10% of an ice cube (or iceberg) will be above the surface of the sea, water is more thick than ice.
In comparison to water of the same volume, ice of the same volume or ice that barely reached the line on the cup would have less substance (water).
Therefore, compared to the density of liquid water ice grows while it develops, it has a lower density than water.
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In an experiment in which the volume of sand is measured by the displacement of water, the sand was slightly wet to begin with. What effect would this have on the volume of air space that was calculated? On the percentage of the volume that was air space?
Wet sand reduces calculated air space volume and lowers the percentage of total volume attributed to air space.
If the sand was slightly wet at the beginning of the experiment, it would have the following effects:
Volume of Air Space: The presence of water in the sand would reduce the amount of air in the sand particles. Therefore, the volume of air space calculated would be underestimated because some of the air spaces are already filled with water.
Percentage of Air Space: Since the volume of air space is underestimated, the percentage of the total volume that is air space would also be **lower** than it actually is.
You raise a penny for each meter you walk in a fundraiser. You walk 15 kilometers. How much money do you raise?
You raise 1,5000 pennies i.e. $150 in this process.
What is multiplication?One of the four fundamental mathematical operations, along with addition, subtraction, and division, is multiplication. Multiplication in mathematics refers to the continual addition of sets of identical size.
Given parameters:
You raise a penny for each meter you walk in a fundraiser.
You walk 15 kilometers.
Now, we know that: 1 kilometer is equal to 1,000 meter.
Then, 15 kilometer is equal to (15 × 1,000) meter = 15,000 meter.
Hence, as you raise a penny for each meter you walk in a fundraiser, in 15,000 meter, the number of pennies you raise
= ( 1 + 1 + 1 + ..... 15,000 times)
= 1 × 15,000
= 15,000
So, you raise 15,000 pennies i.e. $150 in this process.
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What is the likelihood that black holes exist in our galaxy? Explain your response.
It is virtually certain that supermassive black holes exist in our galaxy, with compelling evidence for a massive black hole at the Milky Way's center. Accretion disks around black holes release the tremendous energy seen in quasars. The Milky Way is unlikely to become as luminous as a quasar in the near future.
Explanation:The likelihood that black holes exist in our galaxy is very high. Ground-based observations and data from the W. M. Keck telescopes have provided compelling evidence of a supermassive black hole at the center of the Milky Way. This black hole has a mass of about 4 million times that of the Sun, crammed into an extremely small volume that could fit within the orbit of Mercury. Considering alternatives to a black hole, such as a cluster of stars, would lead to frequent stellar collisions and eventually form a black hole anyway due to the immense mass in such a confined space.
Regarding the question about the energy emitted from quasars, an accreting black hole can explain this phenomenon. As matter falls into a black hole, it forms a hot accretion disk around it, which emits tremendous amounts of energy before the matter is swallowed by the black hole. Thus, while black holes pull matter in, they can also account for the energetic outpourings seen from quasars.
As for whether the Milky Way could become as luminous as a quasar, it is unlikely in the near future since quasars are thought to be the early active stages of galaxies with supermassive black holes rapidly accreting mass. The Milky Way's central black hole does not currently exhibit such intense activity.
Final answer:
It is highly likely that black holes exist in our galaxy, with strong evidence supporting a supermassive black hole at the center of the Milky Way with a mass of about four million times that of the Sun.
Explanation:
The likelihood that black holes exist in our galaxy is very high. Observations have provided compelling evidence for a massive black hole at the center of the Milky Way. This black hole has a mass approximately four million times that of the Sun and fits within a space smaller than the orbit of Mercury. Such a concentration of mass in a small space could not be accounted for by normal stars or clusters of stars as it would result in continuous collisions and eventually lead to the formation of a black hole. Thus, a supermassive black hole is the most plausible explanation for the observed data, including the orbits of stars near the galactic center and the immense gravitational influence within that region. Additionally, similar evidence is found in the centers of other galaxies, reinforcing the existence of these enormous gravity wells.
The concept of structuralism was to have a subject look into his or her mind and try to break down the processes happening there. For example - if you drink your favorite beverage, what do you feel on your tongue? Is it hot? Cold? Sweet? What do you feel as you first smell it? What do you feel when it is in your mouth? Sliding down your throat? This approach of psychology was abandoned over time. In two to three sentences, explain why you think psychologists would stop using structuralism
Structuralism, founded by Wilhelm Wundt, aimed to analyze the basic elements of conscious experience through introspection, where participants reported their thoughts and feelings when exposed to stimuli
. However, psychologists gradually moved away from this method for several reasons:
Subjectivity and Reliability: Introspection relies heavily on individual subjective reports, which can vary greatly between different participants. This subjectivity made it hard to achieve consistent results that can be reliably studied across larger groups.
Unconscious Processes: Scholars began to recognize the significance of unconscious mental processes that influence behavior and thoughts outside of conscious awareness. Structuralism did not effectively account for these unconscious elements, prompting a shift toward schools of thought like behaviorism that focus more on observable actions.
Scientific Rigor: As psychology evolved, there was an increased emphasis on empirical research and controlled experiments. Critics argued that the introspective method used by structuralists lacked the objectivity needed for scientific inquiry.
The diameter of the Moon is 3480 km. What is the surface area of the Moon?
Answer:
Surface area of the moon is [tex]S=3.8\times 10^{13}\ m^2[/tex]
Explanation:
It is given that,
Diameter of the moon, d = 3480 km
Radius of the moon, [tex]r=1740\ km=1740\times 10^3\ m[/tex]
Moon is in the form of sphere. The surface area of the moon is given by :
[tex]S=4\pi r^2[/tex]
[tex]S=4\pi \times (1740\times 10^3)^2[/tex]
[tex]S=3.8\times 10^{13}\ m^2[/tex]
So, the surface area of the moon is [tex]3.8\times 10^{13}\ m^2[/tex]. Hence, this is the required solution.
We have that for the Question "The diameter of the Moon is 3480 km. What is the surface area of the Moon?" it can be said that the surface area of the Moon
A=38045943.67km
From the question we are told
The diameter of the Moon is 3480 km. What is the surface area of the Moon?
Generally the equation for the surface area of a Sphere is mathematically
given as
[tex]A=4\pir^2\\\\Therefore\\\\A=4\pir^2\\\\A=4\pi( 3480 /2)^2\\\\[/tex]
A=38045943.67km
Therefore
the surface area of the Moon
A=38045943.67km
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Unlike a theory, a scientific law describes an observed pattern without attempting to _____ it. prove explain test verify
Answer:
its explain
Explanation:
Unlike a theory, a scientific law describes an observed pattern in nature without attempting to explain it.
Nancy rides her horse 26km in 142 minutes. What is her average speed in kilometers per hour?
Match these items.
1. Ca
2. H2O
3. nuclear decay
4. nuclear synthesis
5. η
6. positive charge
7. e
8. number of protons in nucleus
proton
atomic number
element
compound
fission
electron
neutron
fusion
Explanation:
1. Ca → element
Ca is a symbol of calcium element categorize as alkali earth metal.
2. [tex]H_2O[/tex] → compound
Compound is a substance made up of two more than two different elements.
3. Nuclear decay → fission
Fission is defined as process in which heavier unstable nucleus divide itself into two or more smaller stable nuclei with release of large amount of energy.
4. Nuclear synthesis → fusion
Fusion is defined as process in which two or more nuclei combines together to form an larger nucleus with release of large amount energy.
5. η → neutron
One of the subatomic particle of an atom located in the nucleus of an atom with no electrical charge.
6. Positive charge → proton
One of the subatomic particle of an atom located in the nucleus of an atom with positive electrical charge.
7. e → electron
One of the subatomic particle of an atom located inside an atom and outside the nucleus of an atom with negative electrical charge.
8. Number of protons in nucleus → atomic number
Atomic number of an atom is equal to the total number of protons present in the nucleus if the an atom.
The only item that exists on the planet in all three states of matter at standard pressure is what
Answer:
Water
Explanation:
If we consider the planet to be Earth, it is water. It is the only item that exists in all three states of matter: Water (Liquid state), Ice (Solid state) and water vapor (Gaseous state) at standard pressure. No other elements/compound can exist in all three states at standard pressure. In fact, Earth is the only known planet to have this condition which makes it suitable for life.
determine the mechanical energy of this object: 1-kg ball rolls on the ground at 2 m/s
A. The ball is on the ground, so the mechanical energy is zero
B. 2 J
C. 1 J
D. 4 J
The answer is 2 Joules.
A neutral atom possesses an atomic number of 15 and an atomic mass of 31. Three electrons are gained. What is the result of this conversation
the acceleration of an object would increase if there was an increase in the
Answer:
Force.
Explanation:
Let a is the acceleration of an object. It is given by the rate of change of velocity. Its formula is given by :
[tex]a=\dfrac{dv}{dt}[/tex]
Also there is a relationship between the force and acceleration as per the second law of Newton. Its mathematical expression is given by :
[tex]F=m\times a[/tex]
m is the mass of the object
a is its acceleration.
It is clear that the acceleration of an object is directly proportional to the force. So, the acceleration of an object would increase if there was an increase in the force.
The force that moving charged particles particles exert on one another is called_____.
a) electromagnetic force
b) contact force
c) gravity
d) intermolecular force