To find the unbalanced force you have to use the formula *net force=resultant force=unbalanced force =outside force).
Answer:
N = 2000 drops approx with 1 cm diameter each
Explanation:
Let the diameter of one drop is 1 cm
so volume of one drop is given by

now we have


now in 1L of liquid let say N drops are there
so we have

now we have


so it will have approx 2000 drops in it with diameter 1 cm each drop
Answer:
Either heat added or mechanical work done.
Explanation:
Since he found stirring rod on the desk and a cigarette lighter. This means that the beaker was probably either heated with the aid of fire from the lighter.
Also, the stirring rod could have been used to stir the water which will increase the kinetic energy which also means an increase in temperature.
Thus, it's either heat was added or mechanical work was done as a result of stirring.
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