Answer:
4.351968e+17 seconds
Explanation:
So I googled age of the universe and it says 13.8 billion years.
you'll have to do some conversions:
in one year, there are 365 days. in one day, there are 24 hours. in one hour, there are 3600 seconds.
so you have to add in the current age of the universe to that equation:
arranged so that the proper "units" will read as "x seconds" at the end of the equation.
then you do the math to find x:
13.8 billion x 365 x 24 x 3600 = 4.351968e+17 seconds.
which would be 435,196,800,000,000,000 seconds
Hope this helps :)
Answer:
Option D
2Na + Cl₂ —> 2NaCl
Explanation:
We'll begin by stating the law of conservation of matter.
The law of conservation of matter states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
For an equation to comply with the law of conservation of matter, the number of atoms of each element must be the same on both side of the equation. This simply means that the equation must be balanced!
NOTE: An unbalanced equation simply means matter has been created or destroyed.
Now, we shall determine which equation is balanced. This can be obtained as follow:
For Option A
Na + Cl₂ —> 2NaCl
Reactant:
Na = 1
Cl = 2
Product:
Na = 2
Cl = 2
Thus, the equation is not balanced!
For Option B
2Na + 2Cl₂ —> 2NaCl
Reactant:
Na = 2
Cl = 4
Product:
Na = 2
Cl = 2
Thus, the equation is not balanced!
For Option C
2Na + Cl₂ —> NaCl
Reactant:
Na = 2
Cl = 2
Product:
Na = 1
Cl = 1
Thus, the equation is not balanced!
For Option D
2Na + Cl₂ —> 2NaCl
Reactant:
Na = 2
Cl = 2
Product:
Na = 2
Cl = 2
Thus, the equation is balanced!
From the above illustrations, only option D has a balanced equation. Thus, option D illustrate the law of conservation of matter.
Answer:
Initial velocity of the bullet will be 307.63 m /sec
Explanation:
We have given that mass of the bullet 7.87 gram m= 0.00787 kg
Mass of the block M = 4.648 kg
So total mass M+m = 4.648 +0.00787= 4.655 kg
Spring constant k = 142.7
Compression x=9.46 cm = 0.0946 m
Now according to energy conservation
So initial velocity of the bullet will be 307.63 m /sec
Answer:
ultraviolet light
plz mark me as brainliest.
Answer:
Explanation:
a = (vf - vi)/ t
A a = (5 - 15) / 10 = - 1 m/s²
B a = (25 - 30) / 15 = - 1/3 m/s²
C a = (25 - 20) / 2 = 5/2 m/s²
D a = (-15 - (-10)) / 3 = -5/3 m/s
from most negative to most positive
D, A, B, C
