Physics questions review! Of the following machines, which is not related to the others? Screw, lamp, or lever?

A motorboat travels directly east. During its trip winds blow from directly north, south, and southwest. Which is true?
A. Only southwest wind does work
B. All winds do work
C. Only north wind does work
D. Only south wind does work.

If a runner has power output of 150 W over 10.05, then how much work does he do?

Which is a simple machine?
bicycle, steering wheel system on boat, car or ramp?

which machine is 2 inclined planes?
doorstop, ax, screw, ramp

Question

Physics questions review! Of the following machines, which is not related to the others? Screw, lamp, or lever?

A motorboat travels directly east. During its trip winds blow from directly north, south, and southwest.  Which is true?
A. Only southwest wind does work
B. All winds do work
C. Only north wind does work
D. Only south wind does work.

If a runner has power output of 150 W over 10.05, then how much work does he do?

Which is a simple machine? 
bicycle, steering wheel system on boat, car or ramp?

which machine is 2 inclined planes?
doorstop, ax, screw, ramp

anonymous · Answer

@petiteme

anonymous · Answer

only have 10 minutes left

anonymous · Answer

For the first question I think its A

anonymous · Answer

A lever is not like a screw or lamp... If I understand what they are saying correctly

anonymous · Answer

A ramp is a simple machine and an axe has two inclined planes

anonymous · Answer

ha! I figured it was those just wasn't sure

anonymous · Answer

I would THINK that the second one is B.  All winds do work... But sometimes their forces cancel each other out.  These are kind of weird questions, so they may mean something else.

anonymous · Answer

could you help me with the one about the runner?

anonymous · Answer

The runner one is tough because is kinda poorly worded, so I can't really tell what they are asking :/ Sorry!