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Re: Simple Machines B/Compound Machines C

Posted: April 28th, 2015, 6:59 pm
by UTF-8 U+6211 U+662F
So...

Can I ask a question?

A car has a motor which rotates a _________ (simple machine). How efficient is this? (Guesstimate)

Re: Simple Machines B/Compound Machines C

Posted: April 29th, 2015, 4:24 am
by Unome
70%

Re: Simple Machines B/Compound Machines C

Posted: April 29th, 2015, 7:20 am
by jkang
UTF-8 U+6211 U+662F wrote:So...

Can I ask a question?

A car has a motor which rotates a _________ (simple machine). How efficient is this? (Guesstimate)
wheel and axle, 99%?

Re: Simple Machines B/Compound Machines C

Posted: April 29th, 2015, 7:26 am
by plaid suit guy2
Unome wrote:
[math](10 m)(20/25*20 kg) + (15 m)(x kg) = (5 m)(15 kg) + (2.5 m)(4 kg)[/math]
[math]x=5kg[/math]
Definitely negative
Correct.

So I posted the question, then realized I would need the answers too, and then realized it was negative.

Re: Simple Machines B/Compound Machines C

Posted: April 29th, 2015, 12:15 pm
by UTF-8 U+6211 U+662F
jkang wrote:
UTF-8 U+6211 U+662F wrote:So...

Can I ask a question?

A car has a motor which rotates a _________ (simple machine). How efficient is this? (Guesstimate)
wheel and axle, 99%?
Correct except I was asking how the motor was which is probably more in
30%-40% zone

Re: Simple Machines B/Compound Machines C

Posted: May 13th, 2015, 12:21 pm
by UTF-8 U+6211 U+662F
So, assume this is an ideal simple machine.

What type of machine is this? What is the IMA? Find x. Find the torque generated.
Untitled1.png
Untitled1.png (4.47 KiB) Viewed 5841 times

Re: Simple Machines B/Compound Machines C

Posted: May 13th, 2015, 12:46 pm
by jkang
UTF-8 U+6211 U+662F wrote:So, assume this is an ideal simple machine.

What type of machine is this? What is the IMA? Find x. Find the torque generated.
Untitled1.png
Uh probs a wheel and axle, can't really tell cuz MS Paint is pt cringe. Assuming that x is input, the IMA is 2.5. x = 32 N, and the torque generated (assuming only by x) is 320 Nm.

Re: Simple Machines B/Compound Machines C

Posted: May 13th, 2015, 12:53 pm
by UTF-8 U+6211 U+662F
jkang wrote:
UTF-8 U+6211 U+662F wrote:So, assume this is an ideal simple machine.

What type of machine is this? What is the IMA? Find x. Find the torque generated.
Untitled1.png
Uh probs a wheel and axle, can't really tell cuz MS Paint is pt cringe. Assuming that x is input, the IMA is 2.5. x = 32 N, and the torque generated (assuming only by x) is 320 Nm.
Yes, it is a wheel and axle. The IMA is equal to 10m/8cm, which is 250. Therefore, the IMA is 250. x = 0 N (the arrows are facing perpendicular directions) and therefore, the torque is 0 Nm.
Your turn!