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daydreamer0023 wrote: Also, for the single battery source bonus, would only a single physical battery qualify for this (ie. 4 AA 1.5 V batteries wired together wouldn't count because the source is made of 4 separate batteries)? How was this scored in the past?

Same question.

Also, while this isn't the place for official clarifications, what do you interpret to be a "commercial battery"; a battery one could purchase from a grocery store, or just any purchasable non-industrial battery (under 14.4v and non-lithium of course)?

Snarknado wrote:

daydreamer0023 wrote: Also, for the single battery source bonus, would only a single physical battery qualify for this (ie. 4 AA 1.5 V batteries wired together wouldn't count because the source is made of 4 separate batteries)? How was this scored in the past?

Same question.

Also, while this isn't the place for official clarifications, what do you interpret to be a "commercial battery"; a battery one could purchase from a grocery store, or just any purchasable non-industrial battery (under 14.4v and non-lithium of course)?

I thought this was fairly clear... Basically they are ruling out homemade or improvised battery sources to avoid any safety issues. As for the single battery bonus, I'm pretty sure they literally mean one physical battery.

Do you think using an one arduino with a bunch of sensors would be allowed? It would be a great way to connect the actions

Bluejet1179 wrote:Do you think using an one arduino with a bunch of sensors would be allowed? It would be a great way to connect the actions

According to previous not-clarifications, an Arduino would count as an adjustable device and as such, could only be used for one task, i.e. it could not sense a change in a task, trigger another, and then sense a change in that task. You could get around that by having one Arduino per task, but that would get expensive, and kind of defeat the purpose of the event (IMO not enough to violate General Rule #1). Also please read the thread before you ask a question, this was already answered very extensively by Chalker.

In 4.b.viii, how would you make a pulley with IMA 0.50? Thanks!

SluffAndRuff wrote:In 4.b.viii, how would you make a pulley with IMA 0.50? Thanks!

Take a simple block and tackle (IMA of 2) and reverse the placement of the effort and the load. This will require the effort to have twice the amount force but only move half the distance.

What would qualify as a task being powered by electricity? Would it mean that there could be no electrical components whatsoever, or can there be sensors tripped by non-electrical components? Or can that be put into another task?

I'm no chemistry person and google is of little help so bear with me on this question...

For 4.xi when you need to "use a thermal reaction which expands a gas" does this mean that the reaction has to be caused by heat or can an exothermic reaction be used? Also for "expanding" a gas, does producing a gas fall under this category? Thanks!

SluffAndRuff wrote:I'm no chemistry person and google is of little help so bear with me on this question...

For 4.xi when you need to "use a thermal reaction which expands a gas" does this mean that the reaction has to be caused by heat or can an exothermic reaction be used? Also for "expanding" a gas, does producing a gas fall under this category? Thanks!

My interpretation is that it can only refer to expanding a gas using heat, without adding any gas via chemical means.

andrew lorino wrote:

SluffAndRuff wrote:I'm no chemistry person and google is of little help so bear with me on this question...

For 4.xi when you need to "use a thermal reaction which expands a gas" does this mean that the reaction has to be caused by heat or can an exothermic reaction be used? Also for "expanding" a gas, does producing a gas fall under this category? Thanks!

My interpretation is that it can only refer to expanding a gas using heat, without adding any gas via chemical means.

I believe that is what was said at the coaches clinic.