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A WHEEL OF TIME COMMUNITY
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Physics, Day 1


MattheHat

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Ooh, shiny new blog... *knocks on wall and hears empty echoing-sound*

 

Fill it up then shall we? :wink: *sits down to homework*

 

The power of a motor lifting 1000kg for a height of 6m in 15 seconds... hmmm

 

I'll use the formula for Power, P = W/t, t = obviously 15s, W = in joules(J) which is Nm. And as N = mg, P = mgd/t (where m = mass in kg and g = gravity (9.8ms-2)

That settled... P = (1000kg x 9.8ms-2 x 6m)/15s = 3920Nms-1 = 3920W = 3.9kW (2 s.f.)

 

... Nice, although quite easy still...

 

I must say homework is a lot more fun this way, but it doesn't get done a lot faster :sad:

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