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MArishka [77]
3 years ago
12

If the momentum of a system is to be conserved, which must be true of the net external force acting on the system?

Physics
1 answer:
kari74 [83]3 years ago
7 0

Answer:

D. zero

Explanation:

For momentum of an isolated or closed system to be conserved (initial momentum must equal final momentum), the net external force acting on the system must be zero.

There is always external forces acting on a system, for this system’s momentum to remain constant, all the external forces acting on the system must cancel out, so that the net external force on the system is zero.

F_{ext} = 0

Therefore, the correct option is "D"

D. zero

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Mercury is a liquid metal having a density of 13.6 g/mL. What is the
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Answer:

\boxed {\boxed {\sf v \approx 33.088 \ mL}}

Explanation:

The formula for density is:

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where <em>m</em> is the mass and <em>v</em> is the volume.

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There are 1000 grams in 1 kilogram or \frac{1000 \ g} {1 \ kg}. We can multiply the mass by this ratio.

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Cross multiply.

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We are trying to find the volume, so we must isolate that variable.

13.6 and v are being multiplied. The inverse of multiplication is division. Divide both sides by 13.6

\frac {13.6 \ g/mL*v } { 13.6 \ g/mL} = \frac{ 450 \ g} {13.6 \ g/mL}

v= \frac{ 450 \ g} {13.6 \ g/mL}

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