There are 2.1077x10^24 atoms of sulfur in 3.50 mols of sulfur.
I'm pretty sure its Venus!!!
Answer:
19.95 J
Explanation:
The center of mass of the ladder is initially at a height of:

The center of mass of the ladder ends at a height of:
=L/2
So, the work done is equal to the change in potential energy which is:
W = PE = 
now 
therefore
W = [mgL/2]×[1 - sin(theta)]
W = [(7.30)(9.81)(2.50)/2]×[1-sin(51°)]
solving this we get
W = 19.95 J
|---20----|
| |
| 50 |50
|---D--->|
Start End
Total displacement(D) 20 yards (East).