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**5 SHM Problems i can't get :( HELP!**

http://imageshack.us/a/img201/3924/sadv.png [Broken]

Okay so these are the last 5 problems that I'm stuck on... I've tried a lot and no success, if anyone can please show me the work on how to get them... I've tried all 4 and will explain what I did

1) I found the mass easily but do not know where to go from here....

2) This is my work and it was wrong

0.8kg (m) x 9.8m/s^2 (g) = F

7.84N = F

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F = kx

7.84N = 20N/m × x

7.84/20 = x

0.392 = x

3) I found A-max using A-max = w^2

Plugged that into the equation Acceleration = - Aw^2 sin (wt + ∅) to find t.

Then plugged t into X = Asin(wt+∅) to find it's position... both of which were incorrect

4) I found the positions successfully.. tried to plug those values into the given equation to

find time and no luck...

5) I'm not yet 100% with pendolums so i'll do a little more studying on this one

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Any help on these would be greatly appreciated thank you all :)

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