the answer is C
energy can neither be created nor destroyed; it may only be transformed
Answer:
Explanation:
From the question we are told that
Height of unknown liquid 
Height of glycerin 
Generally at equal levels of liquid pressure
Therefore
Therefore
The Density of the unknown liquid is given by
Gravity is acceleration! You've probably heard of the "force of gravity," and you may have heard of the equation "F=ma." What this equation means is that the force on an object is the same as the mass of the object multiplied by how much it's being accelerated.
K=Frictional Force/Normal Force
Normal force would be mg, since it's not on an incline.
Normal Force = 28 kg*9.8 m/s^2 = 274.4 N
200.3 N/274.4 N = 0.73
