[Puzzle] Maths and Mechanics (16 hours left, hints for all questions)

I'd do it if I had my calculator to solve some of the exponentials

Hint for Q6:
Power = Drive force * Velocity
Resultant force = Mass * Acceleration

I dont understand english good enough too know what's going on in this questions ;<

Hint for Q7:
Another diagram, featuring an impressive drawing of a lorry. Also:
If a body travels with a constant velocity, no resultant force acts.

Hint for Q8:
A final diagram, and some info:
Frictional force = Frictional co-efficient * Reaction force
Moment of a force = Force * Perpendicular distance from pivot
If a system is in equilibrium, there is no resultant moment. You could say clockwise = anti-clockwise.
Apologies if this hint is a bit unhelpful, I'm rather tired. Perhaps Wormy's hint will prove more successful.

Aaaand we're done. If anybody wants fully-worked solutions, take a look here and here.