Got an exam in a month, try this one out as a sample (got a few other beautys as samples)

 

A car travels at a constant speed for 1/4 of a kilometer in 29.2 seconds. During this time the speedometer registers 22MPH.

Is this true speed and if not what is the percentage difference?

Answers to 2 significant figures.

 

Now, I am not all that bad at maths (well, am sh1te really) and cannot work this fuc

 

I have been given a clue that MPH to ms^-1 = x 0.447m WTF!!!!!!!

250/29.2 = 8.56

 

or is my calculator busted?

 

You're right!

 

I did use the correct number in my calculation (see my 1st post) but typed it wrong there which I'm sure muddied the waters.

 

Oh well, that was last night and I was ripped to the tits on ludes and purple hearts.

 

I'm at work now so there's only a couple of Stellas clouding my judgement.

So the speedo should read 19.14mph...right?

So the speedo should read 19.14mph...right?

 

 

That's the true speed, yes. It should read that.

 

(but don't trust me .... I put the wrong number in the calculation before! )

 

 

19.14/22=0.87 therefore the true speed is 13% less than the speedo reading

 

or

 

 

22/19.14=1.15 therefore the reading is 15% over the true speed

 

 

It depends if you express the difference as a percentage of the true speed or a percentage of the (inacurate) speedo reading.

 

I guess either could get a correct answer but am not sure which is 'really correct'.

 

Hope that's not just confusing!

 

Mike? Mike? Pete Shrimp?