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zimovet [89]
3 years ago
6

Unlike expendable molds, permanent molds do not collapse, so the mold must be opened before appreciable cooling contraction occu

rs in order to prevent cracks from developing in the casting: True or False
Engineering
1 answer:
Pani-rosa [81]3 years ago
8 0

Answer: True

Explanation:

Permanent molds do not collapse, unlike expendable molds so the mold must be opened before appreciable cooling contraction occurs in order to prevent cracks from developing in the casting.

The metal casting becomes solid inside the mold after it has been poured. But during the process of manufacture, before the would cools any further, they usually remove the metal cast in order to stop excess contractions of the solid metal casting in the mold. This is done to prevent prevent cracks from developing in the casting since permanent mold do not collapse.

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Answer:

\vec F_{A} = -67500\,N\cdot (i + j)

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The position of each point are the following:

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Since the three objects report charges with same sign, then, net force has a repulsive nature. The net force experimented by point charge A is:

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\vec F_{A} = - \frac{k\cdot q^{2}}{r^{2}} \cdot (i + j)

\vec F_{A} = -\frac{(9 \times 10^{9}\,\frac{N\cdot m^{2}}{C^{2}} )\cdot (3\times 10^{-9}\,C)}{(0.02\,m)^{2}}\cdot (i + j)

\vec F_{A} = -67500\,N\cdot (i + j)

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