Answer:
It's helps Emily became when she swims her hair is not in the way creating friction and making her swim faster. friction acts between two metals blocks that slide past each other.
Explanation:
Temperature doesn't really affect solubility on liquids so it can only be D besides it's already a liquid....
Answer:
The Gravitational force would decrease
Explanation:
To calculate FG the formula is:
Fg=mg
if mass decreases then the gravitational force would decrease
Efficiency = 1000/2000 = 0.5 = 50%
