Answer:
Science, as well as technological and metaphysical questions, should offer solutions to our everyday problems. The consistency of responses offered to society should be increased by research. Science, however, still needs to interact with society in conversation.
Explanation:
A 20 kg curling stone is sliding in a positive direction at 4 m/s. A second curling stone is sliding at the same speed but in the opposite direction. What is the kinetic energy of the two stones?
Answer:
The kinetic energy of the two stones is 320 J
Explanation:
Kinetic energy is the energy that a body possesses due to its movement. So it is the capacity or work that allows an object to go from being at rest, or still, to moving at a certain speed.
In other words, the kinetic energy of an object is that which is produced due to its motion and depends on its mass and velocity as follows:
[tex]Ec=\frac{1}{2} *m*v^{2}[/tex]
where the kinetic energy Ec is measured in joules (J), the mass m is measured in kilograms (kg) and the velocity v in meters/second (m/s).
In this case you know that a 20 kg curling stone is sliding in a positive direction at 4 m/s. So:
m= 20 kgv= 4 m/sReplacing you have:
[tex]Ec_{1} =\frac{1}{2} *20 kg*(4\frac{m}{s}) ^{2}[/tex]
Ec₁= 160 J
A second curling stone slides at the same speed but in the opposite direction. So:
m= 20 kgv= - 4 m/sReplacing you have:
[tex]Ec_{2} =\frac{1}{2} *20 kg*(-4\frac{m}{s}) ^{2}[/tex]
Ec₂= 160 J
The kinetic energy of the two stones is calculated as:
Ec= Ec₁ + Ec₂
Ec= 160 J + 160 J
Ec= 320 J
The kinetic energy of the two stones is 320 J
What substance is produce when hydrogen burn?...
Answer:
Water
Explanation:
hydrogen + oxygen = water
Write the noble gas configuration for nickel
Answer:
[Ar] 3d⁸ 4s²
Explanation:
Atomic number: 28
Symbol: Ni
Atomic mass: 58.6934 u
Read the time line. A timeline. The timeline lists the following years: 100 B C E, 1 C E, 100 C E, 200 C E, 300 C E, 400 C E, 500 C E. What time intervals are used on the time line? one year one hundred years five hundred years one thousand years
100 years
There's 100 years in between each listed year.
Answer:
A 100
Explanation:
By using constants in an experiment, you can make sure that you are testing only one
A)experiment
B)variable
C)hypothesis
D)order
Daniel needed 5.0 x 10 3mm of copper wire for his senior year science project. When Daniel went to the hardware store, he noticed that the unit of measure used for the wire was meters. Calculate the length, in meters, of copper wire Daniel needed for his project.
Answer:
if its 5X 10^3 mm=5m and if its 5X 10^-3 mm=5X 10^-6m
Explanation:
we know,
1m= 1000mm
as given 5X 10^3 mm we have to convert to meter
now 5X 10^3 mm= 5X 10^3/1000=5m
but if its 5X 10^-3 mm= 5X 10^-3/1000= 5X 10^-6m
thank u,
Which best describes a chain reaction associated with a nuclear reaction?!!
Answer: The statement that describes a chain reaction brought about by a nuclear reaction is "neutrons released during a fission reaction cause other nuclei to split." This is applicable to fission reactions only wherein atoms split and produce neutrons that also cause further atoms to split, thus creating a chain or series of reactions.
plz mark brainliest
If density usually increases with decreasing temperature, why does ice float on liquid water? Explain.
Answer:
If you continue to cool water past 4 degrees Celsius, its density starts to plummet (you can see this in the graph). At zero degrees, i.e., the temperature at which water turns into ice, the density of water is actually quite low. It turns out that ice has a lower density than water, and any object that has a lower density than the liquid form on which it’s kept (in this case, water) will be able to float!
Explanation:
The ice floats in water because the hydrogen bonds in the ice change to negative, and Ice is, therefore, less dense than water because the density of water actually reduces as the temperature drops.
What are ice and water?Ice is the form of water. It is the frozen form of water. It is made up of hydrogen and oxygen.
The hydrogen bonds in water change as it cools, holding the negatively charged oxygen atoms apart and preventing the ice from getting much denser.
Water loses density after 4 degrees Celsius of cooling, therefore don't do it The water's density is actually relatively low at zero degrees, the temperature upon which water transforms into ice.
Thus, as it turns out, ice has a lower density than water, therefore any object will be able to float if its density is lower than that of the liquid state it is kept in.
To learn more about ice and water, refer to the below link:
https://brainly.com/question/11696500
#SPJ2
Which of the following questions can be answered by science? (5 points)
Answer:
you didn't put the question
Explanation:
??
Answer:
I. Why is land use more important than water use?
II. Why do human activities affect land?
Explanation:
what are the two main categories of matter
Answer:
pure substances and mixtures
Explanation:
Answer:
Matter can be broken down into two categories. pure substances and mixtures. i hope this helps.
Explanation:
ANSWER PLEASE ..Which property of an element would be MOST helpful in determining its column in
the periodic table?
The column number of an element in the periodic table is generally determined on the basis of the number of valence electrons. The elements in the same column have similar chemical properties.
What are valence electrons?The electrons present in the outermost shell of an atom which take part in chemical reactions are called the valence electrons. These electrons are responsible for the interaction between the atoms and the formation of chemical bonds.
The valence electrons of an atom also gives us an idea about the chemical properties of elements like valency, the number of unpaired electrons present, etc. The column number of an element is mainly determined on the basis of number of valence electrons.
The elements are placed in vertical columns in the periodic table. There are 2 electrons in the outermost shell of Alkaline earth metals. So they belong to second column.
Thus it is the valence electron which determines the column number.
To know more about valence electrons, visit;
https://brainly.com/question/28977387
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Question
The measure of molecular movement is known as
dew point
temperature
condensation
evaporation
110) Lake Michigan holds 1.3 x 10's gallons of water. If just Chicago removed water from the lake and it
never rained again, how many days would the water last? Chicago uses 1.2 x 109 gallons of water /day
gallons/day
You omitted what it was raised to the power in 1.3 x 10's gallons of water, so i will put it up as 1.3 x 10^15 gallons of water and solve with it
Answer:1,083,333 days
Explanation:
Total amount of water held by lake Michigan= 1.3 x 10^15 gallons of water
Amount of water Chicago uses per day =Chicago uses 1.2 x 10^9 gallons of water /day
Therefore,
Number of days water would last if it doesnt rain = Total gallons provided by lake Michigan/ Total gallons consumed per day
=1.3 x 10^15 gallons of water/ 1.2 x 10^9 gallons of water /day
= 1,083,333 days
A hypothesis is based on the analysis of data collected in a controlled
experiment.
True
False
Can someone help with this one I’m desperate
Answer:
C
Explanation:
im not that sure if its correct
Explain how critical thinking helps scientists analyze information for accuracy and bias.
Answer:
Explain how critical thinking helps scientists analyze information for accuracy and bias.
Explanation:
Critical thinking requires scientists to ask questions about information they come across and assess its validity. This facet of critical thinking helps them avoid bias that originates from personal opinion and helps them distinguish information and fact from common belief.
I need help please, will give 5 stars
Been struggling with this question for a while, some help will be appreciated :)
List two things that do not change between isotopes of an element
Answer:
Explanation:
Because different isotopes have different numbers of neutrons, they do not all weigh the same or have the same mass. Different isotopes of the same element have the same atomic number. They have the same number of protons. The atomic number is decided by the number of protons.
Answer:
Because different isotopes have different numbers of neutrons, they do not all weigh the same or have the same mass. Different isotopes of the same element have the same atomic number. They have the same number of protons. The atomic number is decided by the number of protons.
Which decimal is equivalent to 56?
Answer:
The answer is 0.56
Explanation:
your welcome.
Answer:
The answer is 0.56
Explanation:
i think so
7. A square chunk of plastic has a length of 5 cm, width of 5 cm and height of 5 cm. It has a mass of 200 g. What is its density?
Answer:
[tex]d=1.6\ g/cm^3[/tex]
Explanation:
Given that,
The dimension of a square chunk of plastic is 5 cm × 5 cm × 5 cm
Mass, m = 200 g
We need to find its density
Density = mass/volume
It will form a cube. It volume = side³
So,
[tex]d=\dfrac{200\ g}{5^3\ cm^3}\\\\d=1.6\ g/cm^3[/tex]
Hence density is [tex]1.6\ g/cm^3[/tex]
Solve the following problem and round the correct number of significant
figures?
4.5 x 2.34 = ?
Answer:
4.5 + 2.34 = 6.8
Sig Figs:
2
Decimals:
1
Scientific Notation:
6.8 × 10ⁿ
Words:
six point eight
Is 4H2O an organic molecule ?
Answer:
it is an organic molecule
Explanation:
it's a compound called chromium, phosphate tetrahydrate, where tetra stands for 4 , as there are four water molecules attached to the compound.
What is the name of the ionic compound LigPO,?
lanthanum phosphide
lanthanum phosphide
lithium phosphate
lanthanum phosphate
lithium phosphate hope this helps
Baking powder is example of???
Radar detectors use radio waves to measure the speed of moving
vehicles. Radar detectors have a wavelength of 1.8 meters. What is the frequency of waves from a radar detector?
Answer:
1.7x10^8 Hz
Explanation:
Frequency could be explained as the number of occurrences of a repeating event at a time
Given:
wavelength = 1.8 meters
The frequency f of the waves can be calculated using f = c / λ
Where c (m/s) is the speed of the wave
λ (m) is the wavelength
Speed c= 3*10^8 m/s
Frequency f= 3*10^8 /1.8
Frequency= 1.7x10^8 Hz
Therefore,the frequency of waves from a radar detector is 1.7x10^8 Hz
Elements on the right side of the Periodic Table are mostly in what state of matter?
[tex]\huge\mathfrak\red {Answer:}[/tex]
Elements on the right side of the periodic table are mostly Non - metals.
And Nonmetals exist in all three states of matter. The majority are gases, such as nitrogen and oxygen. Bromine is a liquid. A few are solids, such as carbon and sulfur.
[tex]\mathfrak\purple {Hope\: this\: helps\: you...}[/tex]
A different student is given a 10.0g sample labeled CaBr2 that may contain an inert (nonreacting) impurity. Identify a quantity from the results of laboratory analysis that the student could use to determine whether the sample was pure.
Answer:
Mass of Ca in sample, Mass of Br in sample, Number of moles of Ca in sample, Number of moles of Br in sample, Mass or moles of element other than Ca or Br in sample
Explanation:
The AP Classroom will not count your answer to this question as correct unless it includes at least one of the answers listed above. If you say that theanswer to this question is density, it will be marked as incorrect, I found that out the hard way when I used the answers that brainly gave me.
Good luck,
I applaud you for using the sources avalible to you, which is /definetly not/ cheeting.
what is the molecular geometry of SCN- using the electron pair repulsion model?
How might newtons second law relate to an asteriood that is heading toward earth
Answer:
it might be able to get a heading to a earth