Answer:
6.817 x 10^-4
Explanation:
You first need to put the decimal between the ones and tenths (6.8), then you count back to the original decimal point. If you are counting to the left then its going to be a negative exponent but if you count towards the right, it'll be a positive exponent. So from 6.817 to 0.0006817, it is 4 places back. Thats how you get the answer. Hope this helps a bit
Sawing the piece of wood in half is a physical change,
because no new substances are formed that weren't there
before the sawing.
Burning wood produces carbon monoxide and carbon dioxide
that weren't there before the burning. That's a chemical change.
Rust forming on iron is iron oxide that wasn't there before the
rusting. That's a chemical change.
The green that appears on copper is copper oxide that wasn't
there before the green appeared. That's a chemical change.
Answer:
A ) 
b) There are approximately 100,000,000 atoms on the 1.32 cm lines
Explanation:
To ensure the accuracy of our answer, we will have to make sure we work in the appropriate units.
A
To convert 
to inches, we can use this factor.
1 m = 39.3701 inches
Therefore =
B
To find the number of atoms on a 1.32 cm line, we will first of all need to convert 1.32 cm to meters.
1.32 cm = 0.0132 metres (divided 1.32 by 100 to convert to metres)
Assuming all the atoms are arranged side by side, with their edges touching on the 0.0132m line, the number of atoms present will be
= 100,000,000 atoms
The 4ohm resistor is not parallel to any devices, so the current through it is the same as the total current through the circuit.
Apply I = V/R
I = total current, V = battery voltage, R = total resistance
Calculate the total resistance R of the circuit first.
R will be the sum of the 4ohm resistor and the resistance of the 5&9ohm parallel resistors. To find the resistance of the pair, you apply the “sum of inverses” rule:
R = 1/(1/5 + 1/9) = 3.21ohm
Now add the 4ohm resistor:
R = 3.21 + 4 = 7.21ohm
Now let’s calculate I = V/R:
Given values:
V = 6.0V
R = 7.21ohm
Plug in and solve for I:
I = 6.0/7.21
I = 0.83A
Explanation:
C) is incorrect. The mass is equivalent to the moment of inertia in an angular formula.
The others appear all correct.
T * theta = F * r * theta = F * (r theta) = fx = work
This is the only one that needed explanation. The others should be obvious.
