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horrorfan [7]
3 years ago
5

Explain why it is important to identify a reference point for any description of motion.

Physics
2 answers:
CaHeK987 [17]3 years ago
6 0
N the particular case of motion, a reference point is a stationary point in space. You can then measure the displacement of objects in space from this point. A reference point is important in determining motion because in order to say that something is moving, you need to have something stationary to compare it to.
Leya [2.2K]3 years ago
3 0

A reference is critical because it determines how much motion has occurred. You can't determine how much an objected has moved if you don't know where it came from.

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A cylindrical barrel is completely full of water and sealed at the top except for a narrow tube extending vertically through the
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To solve this problem it is necessary to apply the concepts related to pressure as a unit that measures the force applied in a specific area as well as pressure as a measurement of the density of the liquid to which it is subjected, its depth and the respective gravity.

The two definitions of pressure can be enclosed under the following equations

P = \frac{F}{A}

Where

F= Force

A = Area

P = \rho gh

Where,

\rho = Density

g = Gravity

h = Height

Our values are given as,

d = 0.8m \rightarrow r = 0.4m

A = \pi r^2 = \pi * 0.4^2 = 0.503m^2

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Matching the two previous expressions we have to

\frac{F}{A} = \rho g h

Re-arrange to find h

h = \frac{F}{A\rho g}

h = \frac{390}{(0.503)(1000)(9.8)}

h = 0.079m

h = 7.9cm

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