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
Calcium carbide ( CaC2) reacts with water to produce acetylene (C2H2) as shown in the unbalanced reaction below: CaC2(s)+H2O(g)->Ca(OH)2(s)+C2H2(g). How many grams of H2O are required to completely react with 82.4g of CaC2
The given reaction can be balanced as follows: CaC2 + 2H2O → Ca (OH)2 + C2H2. Grams of water required to completely react with 82.4 g of CaC2 is 46.28 g.
What is a balanced reaction?
In balanced reaction, the number of each and every element on both side is balanced. In the given reaction to balance the number of H and O, add 2 to H₂O so that, all the species will be equal in number on both side.
Now, as per the balanced reaction, 2 moles of water is required to reacts with 1 mole of CaC2.
Mass of one mole of water = 18 g/mol.
2 mole = 36 g
Mass of one mole of CaC2 = 64.09 g/mol
Thus 36 g of water is required to react with 64.09 grams of calcium carbide. Mass of water required to react with 82.4 g of calcium carbide is calculated as follows:
Mass of water = (36 g×82.4 g)/64.09 g = 46.28 g
Hence, 46.28 grams of water is required to completely react with 82.4 g of calcium carbide.
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How many significant figures are in the following number?
5.67 x 106
3
6
4
What does weight measure?
A: Quantity of matter in an object
B: How much space an object takes up
C: Force of gravity acting on an object
D: How long it takes for an event to occur
I really need help with this before 5:10
Show your work
Your big brother has been brageing about how he can bench press 4.000 grams at the gym. Sounds impressive.
but you know better. Use your skills to find how many pounds of weight he is actually pressing.
8. In
studies, scientists do not interfere with what is going on.
Answer:
Observational
Explanation:
This is the answer because researchers or scientist observe the effect of a diagnostic test, treatment or other intervention without trying to change anything.
What is the mass number of beryllium
Answer:
9.012182 u
Explanation:
why are group viia elements very active nonmetals
Which of the following is a noncontact force?
Answer:
gravity
Explanation: its a force that pulls you down but you are never making contact with it
Answer: Gravity
Explanation:
It pushes you down but you never actually touch it
Need help with this
Answer:
environmentalism I think
Explanation:
...................
Answer:
2nd choice answer
Explanation:
thats ez tbh
what does it mean to say that a hypothesis is falsifiable
Answer: This means that the answer can be proven wrong.
Explanation:
Hope this helps!!
Answer:
is means it can be proven false
Find the force if the mass is 6 kg and the acceleration is 12 m/s/s?
Answer:
72 Newton
Explanation:
force=mass x acceleration due to gravity
Force applied on object is 72 Newton
Given that;
mass of thing = 6 kg
Acceleration = 12 m/s²
Find:
Force applied on object
Computation:
Force = mass × acceleration
Force applied on object = 6 × 12
Force applied on object = 72 Newton
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What is Polymerase Chain Reaction?
Answer:
Polymerase Chain reaction is a method used by scientists to making A LOT (millions to billions) of copies of a DNA sample which then allows scientists to take a small of that DNA and increase the amount to a very large amount to study the DNA into further detail.
Polymerase Chain Reaction (PCR)
Polymerase chain reaction (PCR) is a technique for replicating or copying a specific portion of a DNA strand; leads to millions of copies of the DNA segment technique for replicating or copying a specific portion of a DNA strand; leads to millions of copies of the DNA segment.
Give me a hand，Solve this problem，Need everyone's help
Answer:
A. 8.8 g.
B. 5.3 g.
C. 449 g.
Explanation:
A. Determination of the mass of CO2.
Mole of CO2 = 0.2 mole
Molar mass of CO2 = 12 + (2×16)
= 12 + 32
= 44 g/mol
Mass of CO2 =?
Mole = mass /Molar mass
0.2 = mass of CO2 /44
Cross multiply
Mass of CO2 = 0.2 × 44
Mass of CO2 = 8.8 g
B. Determination of the mass of Na2CO3.
Mole of Na2CO3 = 0.05 mole
Molar mass of Na2CO3 = (2×23) + 12 + (3×16)
= 46 + 12 + 48
= 106 g/mol
Mass of Na2CO3 =?
Mole = mass /Molar mass
0.05 = mass of Na2CO3 /106
Cross multiply
Mass of Na2CO3 = 0.05 × 106
Mass of Na2CO3 = 5.3 g
C. Determination of the mass of Fe(OH)2.
Mole of Fe(OH)2 = 5 moles
Molar mass of Fe(OH)2 = 55.8 + 2(16 + 1)
= 55.8 + 2(17)
= 55.8 + 34
= 89.8 g/mol
Mass of Fe(OH)2 =?
Mole = mass /Molar mass
5 = mass of Fe(OH)2/89.8
Cross multiply
Mass of Fe(OH)2 = 5 × 89.9
Mass of Fe(OH)2 = 449 g.
How did Edward Teller died?
Answer:
septembar 9 2003
Explanation:
he died in september 9 2003
Answer:
Your answer:
His cause of death was a stroke ( heart attack)
hope this helped you
please mark as the brainliest (ㆁωㆁ)
Diffrentiate between atoms and ions.
The results of an investigation are the
(Blank)
Answer: ending results
Explanation:
A given volume of methane diffuses in 20 seconds How long will it take the
same volume of sulphur (IV) oxide to
diffuse under the same condition
(Methane = 16, Sulphur (IV) oxide=64)
Explanation:
Relative molecular mass of CH4 = 12 * 1 + 4 = 16
Relative molecular mass of SO2 = 32 + 10 *2 = 64
tSO2/tCH4 = √MSO2/MCH4
t/20 = √64/16 = √4
t/20 = 2
∴ t = 20 * 2 = 40sec
POSSIBLE POINTS: 33.33
What is the name of the binary molecule H202? This compound is also known as hydrogen peroxide and is a popular disinfectant for cuts or
scrapes
Dihydrogen monoxide
O Hydrogen dioxide
Dihydrogen Dioxide
None of this makes any sense
Answer:
Dihydrogen Dioxide
The name of binary molecule H₂O₂ is also known as hydrogen peroxide and is a popular disinfectant for cuts or scrapes is dihydrogen dioxide. The correct option is A.
What is dihydrogen dioxide?Dihydrogen dioxide is the substance of water with extra oxygen molecules. In the dihydrogen monoxide parody, water is referred to by a strange scientific term, most frequently "dihydrogen monoxide,". It is a poisonous gas, and it is leading to the death of many people in America. It is known as DHMO.
Some of its characteristics are listed in an especially ominous manner, such as speeding up corrosion and inducing asphyxia. This substance, commonly referred to as hydrogen peroxide, is used frequently as a disinfectant for cuts and scrapes.
Thus, the correct option is A. Dihydrogen dioxide.
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This element has nine more electrons than Technetium
Answer:
Tellurium
Explanation:
Technetium's position on the periodic table is 43 and Tellurium's is 52
how to calculate molecular mass?
Please refer to the attachment!
Hope it will help u,
Thankyou======#Itz_Ravi❤️=======1.54x10-1 L / 2.36x 10-45 solve this in scientific notation
Answer:
Fish is the best time to go
Explanation:
Chicken nuggets and a salad and some onion rings and a new charger
SHOW YOUR WORK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
An experiment was conducted to find the mass of one mole of carbon atoms. The results of the experiment showed that a mole of carbon atoms had a mass of 15.78 g. The accepted value of a mole of carbon atoms is 16.00 grams. What is the percent error in this experiment?
Answer:
1.375%
Explanation:
Percent Error = measured value - accepted value/ accepted value x 100
Measured Value: 15.78
Accepted Value: 16.00
Work:
[tex]\frac{15.78-16.00}{16.00}[/tex] * 100
[tex]\frac{-.22}{16}[/tex] * 100 = -1.375
You cannot have a negative percentage. Therefore the answer is 1.375%
Which is the electron configuration for boron? 1s22s3 1s22s23s1 1s12s22p2 1s22s22p1
Answer:
electron configuration for boron is 1s22s22p1
Answer:
D
(answer is D)
Which of the following is one way creativity can help scientists?
Answer:
One way creativity is helpful to scientists is when they need to come up with a experiment or cure for something their imaginastion is very helpful. The reason for that is with creativity they could get answers much quicker!
Explanation:
Answer:
I agree with that answer
find the odd one out and explain the reason why ? sand , sugar , salt , baking soda
Answer: Sand
Explanation: Out of all the choices, sand is the only one that cannot react with other substances.
Answer:
sand
Explanation:
all are used mostly in cookin and preparing things and are in the kitchen
why does neon have a higher first ionization energy than fluorine
How do you do a one pager online!?!?!
I couldn’t find science so I just chose chemistry
What is the formula for potassium nitrate?
Express a mass of 0.056 mg in grams.
Answer in units of g.
Answer:
0.000056g
Explanation:
1 mg = 0.001 g
Or if it helps move your decimal sign over left 3 places.
23°C = ______ K
-250
296
123
23
Answer:
296
Explanation:
Tk = ºC + 273
Tk = 23 + 273
T = 296 K