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Biology; Chemistry; Physics: Post your doubts here!

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What is a RESULTANT force??
the sum of all the forces. for example if u have three forces, put each's head on others tail and draw from first top to last tail. it's direction show the direction of force and it's size represent the magnitude of force.
mostly u have two forces to add, add them by this head or tail method. u will be given the angles to help u find the angle between the two vectors and find recultant using cosine rule if they do not ask u to do it using graphical method.
if u still feel any difficulty ask me which question to solve and i will upload it's diagram.
 
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Which statement is
not
a reason for the importance of recycling aluminium?
A
Aluminium is a rare metal in the Earth’s crust.
B
The demand for aluminium continues to rise annually.
C
The extraction of aluminium from its ore is expensive.
D
The properties of aluminium make it one of the most useful of all metals
think its A
 
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a
25
Which statement is
not
a reason for the importance of recycling aluminium?
A
Aluminium is a rare metal in the Earth’s crust.
B
The demand for aluminium continues to rise annually.
C
The extraction of aluminium from its ore is expensive.
D
The properties of aluminium make it one of the most useful of all metals
A
 
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