Simple Machines B/Compound Machines C Question Marathon
-
fantasyfan
- Member
- Posts: 69
- Joined: Sat Feb 18, 2012 7:19 pm
- Division: C
- State: NY
- Has thanked: 0
- Been thanked: 0
Re: Simple Machines B/Compound Machines C Question Marathon
A first class lever(to amplify the force), two third class levers (to lower the wedges) and two wedges (to clip the nail)
Looking forward to anatomy, protein, fossils, and optics (NYS trial) this year!
-
jjetpack
- Member
- Posts: 0
- Joined: Mon May 06, 2013 5:36 pm
- Division: C
- State: TX
- Has thanked: 0
- Been thanked: 0
Re: Simple Machines B/Compound Machines C Question Marathon
Wait, wouldn't it be composed of a second class lever (imput on the handle, output on the top wedge, with the cylinder as the fulcrum) and only one 3rd class lever (the bottom wedge usually doesn't move). And then of course two wedges.fantasyfan wrote:A first class lever(to amplify the force), two third class levers (to lower the wedges) and two wedges (to clip the nail)
-
chinesesushi
- Member
- Posts: 259
- Joined: Tue Sep 17, 2013 4:57 pm
- Division: C
- State: CA
- Has thanked: 0
- Been thanked: 13 times
Re: Simple Machines B/Compound Machines C Question Marathon
jjetpack wrote:Wait, wouldn't it be composed of a second class lever (imput on the handle, output on the top wedge, with the cylinder as the fulcrum) and only one 3rd class lever (the bottom wedge usually doesn't move). And then of course two wedges.fantasyfan wrote:A first class lever(to amplify the force), two third class levers (to lower the wedges) and two wedges (to clip the nail)
jjetpack is correct. The lever which you press down upon is a 2nd class lever which exerts a force on a 3rd class lever. Your turn.
Never argue with an idiot, they will drag you down to their level and then beat you with experience.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.
-
jjetpack
- Member
- Posts: 0
- Joined: Mon May 06, 2013 5:36 pm
- Division: C
- State: TX
- Has thanked: 0
- Been thanked: 0
Re: Simple Machines B/Compound Machines C Question Marathon
Ok, here goes nothing.
A certain single-helical screw has a head whose diameter is 1/2" and a pitch of 1/10". If you apply 100N to turn the screw (just rotational, no downward force) and the screw drives into the wood below with 141N, what is the screw's efficiency?
A certain single-helical screw has a head whose diameter is 1/2" and a pitch of 1/10". If you apply 100N to turn the screw (just rotational, no downward force) and the screw drives into the wood below with 141N, what is the screw's efficiency?
-
chinesesushi
- Member
- Posts: 259
- Joined: Tue Sep 17, 2013 4:57 pm
- Division: C
- State: CA
- Has thanked: 0
- Been thanked: 13 times
Re: Simple Machines B/Compound Machines C Question Marathon
jjetpack wrote:Ok, here goes nothing.
A certain single-helical screw has a head whose diameter is 1/2" and a pitch of 1/10". If you apply 100N to turn the screw (just rotational, no downward force) and the screw drives into the wood below with 141N, what is the screw's efficiency?
8.98%
Never argue with an idiot, they will drag you down to their level and then beat you with experience.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.
-
jjetpack
- Member
- Posts: 0
- Joined: Mon May 06, 2013 5:36 pm
- Division: C
- State: TX
- Has thanked: 0
- Been thanked: 0
Re: Simple Machines B/Compound Machines C Question Marathon
Correct. Screws have a LOT of friction...
Your turn, chinesesushi
Your turn, chinesesushi
-
chinesesushi
- Member
- Posts: 259
- Joined: Tue Sep 17, 2013 4:57 pm
- Division: C
- State: CA
- Has thanked: 0
- Been thanked: 13 times
Re: Simple Machines B/Compound Machines C Question Marathon
Draw a compound machine that consists of at least three different types of simple machines and a 1st class and 2nd class lever that has a mechanical advantage that totals to 210.
Never argue with an idiot, they will drag you down to their level and then beat you with experience.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.
-
chinesesushi
- Member
- Posts: 259
- Joined: Tue Sep 17, 2013 4:57 pm
- Division: C
- State: CA
- Has thanked: 0
- Been thanked: 13 times
Re: Simple Machines B/Compound Machines C Question Marathon
It's been too long since we had a question for this event. Now it's located underneath all the other marathons. So...
Which scientist/engineer was the first to derive the mechanical advantage of an inclined plane and in what year did he do it?
Never argue with an idiot, they will drag you down to their level and then beat you with experience.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.
-
helicpters_rule
- Member
- Posts: 44
- Joined: Sat Nov 16, 2013 7:17 pm
- Division: B
- State: OH
- Has thanked: 0
- Been thanked: 0
Re: Simple Machines B/Compound Machines C Question Marathon
chinesesushi wrote:It's been too long since we had a question for this event. Now it's located underneath all the other marathons. So...
Which scientist/engineer was the first to derive the mechanical advantage of an inclined plane and in what year did he do it?
1586, Flemish engineer Simon Stevin (Stevinus) its copyed from wikipedia
-
chinesesushi
- Member
- Posts: 259
- Joined: Tue Sep 17, 2013 4:57 pm
- Division: C
- State: CA
- Has thanked: 0
- Been thanked: 13 times
Re: Simple Machines B/Compound Machines C Question Marathon
Yeah.
Never argue with an idiot, they will drag you down to their level and then beat you with experience.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.