1. Which of these materials is the strongest? O CHIPBOARD
O PLYWOOD
PINE
O BLOCKBOARD
MDF

Please help me with this question, very urgent, I will pay extra bonus points if done correctly.

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

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What is a monomer? how do they form a ploymer from the view point of chemical bonding?