Simple Machines B/Compound Machines C

User avatar
UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 726
Joined: Sun Jan 18, 2015 3:42 pm
Division: C
State: PA
Location: (0, 0)
Contact:

Re: Simple Machines B/Compound Machines C

Postby UTF-8 U+6211 U+662F » Wed Apr 29, 2015 1:59 am

So...

Can I ask a question?

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

User avatar
Unome
Moderator
Moderator
Posts: 3329
Joined: Sun Jan 26, 2014 8:48 pm
Division: Grad
State: GA
Location: somewhere in the sciolyverse
Contact:

Re: Simple Machines B/Compound Machines C

Postby Unome » Wed Apr 29, 2015 11:24 am

Fermi! (without exponents)
70%
Userpage
Chattahoochee High School

2018 Events: Anatomy and Physiology, Astronomy, Disease Detectives, Fermi Questions, Herpetology, Materials Science, Remote Sensing

jkang
Member
Member
Posts: 107
Joined: Sat Oct 18, 2014 3:49 am
Division: Grad
State: TX
Contact:

Re: Simple Machines B/Compound Machines C

Postby jkang » Wed Apr 29, 2015 2:20 pm

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)

Uhhh
wheel and axle, 99%?
UT Austin '19
Liberal Arts and Science Academy '15

plaid suit guy2
Member
Member
Posts: 60
Joined: Mon May 20, 2013 1:45 am
Division: C
State: CO
Contact:

Re: Simple Machines B/Compound Machines C

Postby plaid suit guy2 » Wed Apr 29, 2015 2:26 pm

Unome wrote:
Answer


Definitely negative


Correct.

So I posted the question, then realized I would need the answers too, and then realized it was negative.
blue and yellow plaid suit
Nationals 2012:
Sound of Music: 8th

Nationals 2013:
Remote Sensing: 1st
ELG: 1st
MagLev: 6th

State 2014:
Boomi: 1st (scored 1824)
Circuits: 1st
Compound: 3rd
Malgev: 1st
MP: 2nd

total gold: 18
total silver: 10
total bronze: 5
6th: 1
Poudre High School class of '15

User avatar
UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 726
Joined: Sun Jan 18, 2015 3:42 pm
Division: C
State: PA
Location: (0, 0)
Contact:

Re: Simple Machines B/Compound Machines C

Postby UTF-8 U+6211 U+662F » Wed Apr 29, 2015 7:15 pm

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)

Uhhh
wheel and axle, 99%?

Correct except I was asking how the motor was which is probably more in
the
30%-40% zone

User avatar
UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 726
Joined: Sun Jan 18, 2015 3:42 pm
Division: C
State: PA
Location: (0, 0)
Contact:

Re: Simple Machines B/Compound Machines C

Postby UTF-8 U+6211 U+662F » Wed May 13, 2015 7:21 pm

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 1358 times

jkang
Member
Member
Posts: 107
Joined: Sat Oct 18, 2014 3:49 am
Division: Grad
State: TX
Contact:

Re: Simple Machines B/Compound Machines C

Postby jkang » Wed May 13, 2015 7:46 pm

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

Answer
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.
UT Austin '19
Liberal Arts and Science Academy '15

User avatar
UTF-8 U+6211 U+662F
Exalted Member
Exalted Member
Posts: 726
Joined: Sun Jan 18, 2015 3:42 pm
Division: C
State: PA
Location: (0, 0)
Contact:

Re: Simple Machines B/Compound Machines C

Postby UTF-8 U+6211 U+662F » Wed May 13, 2015 7:53 pm

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

Answer
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.

This was kind of a trick question...
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!


Return to “2015 Question Marathons”

Who is online

Users browsing this forum: No registered users and 1 guest