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mash [69]
4 years ago
11

How do i know which equation to use for dimensional analysis?

Physics
1 answer:
nikitadnepr [17]4 years ago
7 0
You look at the units you want, then try to figure out which units ti multiply by to get the units you have to match the units you want. For example, if you want kg/m^3 and have m/s

You can see that you have a length/time(lets denote it d/t for distance over time) and want mass/volume (lets denote it m/d^3). d/t multiplied by time=d but we want m/d^3 so lets multiply our original d/t by time(t) and mass(m) so d/t(t) (m) =dm. However, we want m/d^3 so we will also have to divide by d^4.

(d/t)(t)(m) /(d^4)=m/d^3 = mass/length^3 =mass/volume which was what we wanted our end result to be.


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Answer:

P + C = W if in equilibrium?

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Explanation:

Action and reaction are equal and opposite according to newton's third law of motion. a force is that which tends to change a body's state of rest or uniform motion in a straight line, recall

P is the upward force the person exerts on the crate,

C is the vertical contact force exerted on the crate by the floor,

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let the sum of upward forces be on the left hand side of the equation and the sum of downward forces on the right hand side.

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P+C-W=0 if they are in equilibrium

the forces are related by the above.

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