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||Homework Help||Kindergarten-University. (Page 9)

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Posted: 29 September 2011 at 4:57pm | IP Logged
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akhl IF-Rockerz
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Posted: 29 September 2011 at 5:02pm | IP Logged
@Ayeshaa,
The minute hand completes one revolution in 1 hour i.e. 3600 s
This means if cycle = 1, then time = 3600 s
Period = 3600 s/1 = 3600 s

You can also say that period is the time taken to complete one cycle.

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akhl IF-Rockerz
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Posted: 29 September 2011 at 5:21pm | IP Logged
@Ayeshaa, in 4 our of 8, only 4 is important because 4 sparks fire in one revolution.

a) (3.6 * 10^2 r/min) * (4 sparks/r)
= 3.6 * 10^2 * 4 sparks/min
= 3.6 * 10^2 * 4/60 sparks/second
= 24 sparks/second

Ans: 24
 
b) For sparks, frequency = 24 s^-1
Time between spakrs = period = 1/frequency = (1/24) second
If you want to write in decimal, then the answer is
4.2 * 10^-2 second



Edited by akhl - 29 September 2011 at 5:22pm

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Angel-Jot. IF-Veteran Member
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Posted: 29 September 2011 at 5:43pm | IP Logged
Guys. The first page, third reserved post has been edited. In it i've posted everyone who has said that they can help with a certain subject. So check that if you want. Also links provided here are also posted there.

And, i can help with English, French and Canadian History if you need help. Big smile

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akhl IF-Rockerz
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Posted: 29 September 2011 at 5:49pm | IP Logged
@Ayeshaa,
For part a, we have to find how many sparks fire in one second.
This means we need sparks/second
Formula is not needed.
Question gives 3.6 * 10^2 r/min and 4 sparks/r
If you multiply them, then r and r will cancel and you are left with sparks/min
You know 1 min = 60 s, therefore you can convert it into sparks/second


In part b, the unit is sparks/second. The second is in denominator, which can be written as second^-1 which I shortened to s^-1. We can skip "sparks" because we already know that we are talking about sparks.



Edited by akhl - 29 September 2011 at 5:54pm

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