1) 211m/s
2)240<span>°
3)759,600m or 759.6 km</span>
Answer: Water can either increase or decrease the friction between surfaces.
Answer:
Part a)

Part B)
percentage increase is
%
Explanation:
Part a)
As we know that the beat frequency is

after increasing the tension the beat frequency is decreased and hence the tension in string B will increase
So we have


Part B)
percentage increase in the tension of the string will be given as


now we have

so we have


so we have

percentage increase is

The density would increase because you still have the same amount of weight, but it is just packed more tightly in a smaller object.