Answer:
3 × 10¯¹⁰
Explanation:
9×10² ÷ 3×10¹²
The above expression can be simplified as follow:
9×10² ÷ 3×10¹²
Recall:
9 = 3²
9×10² ÷ 3×10¹² = 3²×10² ÷ 3×10¹²
Recall:
a^m ÷ a^n = a^(m – n)
3²×10² ÷ 3×10¹² = 3^(2 – 1) × 10^(2 – 12)
= 3¹ × 10¯¹⁰
Recall:
a¹ = a
3¹ × 10¯¹⁰ = 3 × 10¯¹⁰
A physical change. chemical changes require the molecule itself to change. If you put NaCl into solution, the NaCl is still there which is evident by the fact that if you lower the amount of water, NaCl precipitates out.
Answer:
90MJ
Explanation:
Energy= mc^2
Where c= speed of light
m= mass of the object
Mass= m = 1 ug ( then we need to convert from micro gram to micro Joule)= 0.000000001
C= 3× 10^8 m/s
E= = [0.000000001 × (3× 10^8 )^2]
E = [0.000000001 × 89 875 517 873 681]
= 89 875 517.9 joule
Then we can convert to megajoules as
90MJ
