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Answer:
There are two tension adjustments on the sewing machine the upper and the lower. The upper tension controls the thread from the needle, while the lower tension controls the thread from the bobbin case. These tensions must be adjusted to suit various fabrics.
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Answer:
a,b,d: physical property
c: chemical property
Explanation:
(a) Metallic lustre is classified as a physical property because the metallic substance is not being changed
(b) Boiling point is classified as a physical property because in boiling point composition of matter is not changed.
(c) explodes when ignited: This one is classified as a chemical property because it does not remain the same substance when something is exploding. It changes.
(d) changes colour when mixed with water: this one is classified as a physical property as the substance remains the same as the physical properties does not change when it is mixed with water.