Explanation:
Distance travelled by bus(s)=15 miles
Time taken(t)=18 minutes
=18/60 hours=0.3hours
now
average speed=distance travelled /time taken
=15/0.3 =50 miles per hour
8. In soft magnetic materials such as iron, what happens when an external magnetic field is removed?
a. The domain alignment persists.
b. The orientation of domains fluctuates.
c. The material becomes a hard magnetic material.
d. The orientation of domains changes, and the material returns to an unmagnetized state.
9. According to Lenz’s law, if the applied magnetic field changes,
a. the induced field attempts to keep the total field strength constant.
b. the induced field attempts to increase the total field strength.
c. the induced field attempts to decrease the total field strength.
d. the induced field attempts to oscillate about an equilibrium value.
10. The direction of the force on a current-carrying wire in an external magnetic field is
a. perpendicular to the current only.
b. perpendicular to the magnetic field only.
c. perpendicular to the current and to the magnetic field.
d. parallel to the current and to the magnetic field
Its accelarating from 1-10 i know that because the line is going up. i hope i helped
solution:
The first step is that both the top and bottom forces cancel out because if you remember that each atom has either a +e or -e, you can conclude that since they are at the same length, that they cancel.
So the only part you really need to worry about is the middle one with the distance of .300 nm. From there, you find the distance between both bonds of N-H (one is....11 while the other is .19).
Then for each one you use 
If you calculate both correctly, you will get
Then just add the two and you got the answer!
