Question and answer
Question not found
Ask a question
Not a good answer? Get an answer now. (Free)
New answers
Rating

There are no new answers.

Comments

There are no comments.

Add an answer or comment
Log in or sign up first.
Questions asked by the same visitor
Each supporting strand of a block and tackle increases the mechanical advantage by
Weegy: Let's look at a simple system. A block with three wheels is attached to the ceiling and a block with three wheels is attached to a load to be lifted off the floor. [ As well as the block attached to the ceiling, we have a hook there also near to the block and we start by knotting one end of our rope onto that hook. We now run the free end of the rope through the bottom block, back up through the top block, back down to the bottom block and so on, finishing up with the free end of the rope coming out of the third wheel at the top and hanging down. Now for the physics. Physics says that a well oiled pulley wheel cannot alter the load in a rope passing over it. Therefore, we have to accept that the load in any part of the rope is the same. Now we count how many lengths of rope are going to be lifting the load. I see six. Three wheels in the bottom block and two lengths of rope to each wheel. As these six ropes are all pulling upwards when we pull down on the free end, and the load in each rope is the same, the load in the rope is one sixth of the weight to be lifted. This is the pull required on the free end just to hold the load off the floor. A sightly greater pull will overcome any friction in the pulleys and start the load moving upwards. The mechanical advantage of the system we have here is 6. An interesting variation is when we have four wheels in the bottom block and pass what was the free end hanging down through the fourth wheel. We now have the free end to be pulled upwards and it will be contributing to the lifting forces on the weight. There are now eight lengths of rope lifting the weight and the pull required will be just a tad more than one eighth (1/8) of the weight to be lifted. Read more: ] (More)
Question
Expert Answered
Asked 5/11/2011 1:54:35 PM
0 Answers/Comments
19,802,703 questions answered
Popular Conversations
The normal balance of an account is the
Weegy: The normal balance of an account is the debit balance. User: Which of the following accounts have normal debit ...
3/5/2015 4:21:31 PM| 2 Answers
Revenues and expenses are found on the a statement of owners equality ...
Weegy: Revenues and expenses are found on the B. Balance sheet
3/5/2015 4:42:18 PM| 2 Answers
Which of the following was a result of Austria-Hungary s annexation ...
Weegy: The following was a result of Austria-Hungary s annexation of Bosnia and Herzegovina- The stage was set for WWI. ...
3/5/2015 12:03:54 AM| 1 Answers
What is matrix
3/5/2015 12:09:40 AM| 1 Answers
Weegy Stuff
S
L
P
L
P
P
P
Points 293 [Total 8179]| Ratings 0| Comments 293| Invitations 0|Offline
S
P
C
L
P
L
1
P
Points 144 [Total 7451]| Ratings 1| Comments 134| Invitations 0|Offline
S
1
L
Points 94 [Total 1005]| Ratings 1| Comments 84| Invitations 0|Offline
S
1
L
L
Points 79 [Total 7580]| Ratings 0| Comments 79| Invitations 0|Offline
S
Points 72 [Total 577]| Ratings 4| Comments 32| Invitations 0|Offline
S
Points 22 [Total 390]| Ratings 0| Comments 22| Invitations 0|Offline
S
Points 17 [Total 108]| Ratings 0| Comments 17| Invitations 0|Offline
S
Points 12 [Total 12]| Ratings 0| Comments 12| Invitations 0|Offline
S
Points 11 [Total 127]| Ratings 1| Comments 1| Invitations 0|Offline
S
Points 10 [Total 10]| Ratings 1| Comments 0| Invitations 0|Offline
Home | Contact | Blog | About | Terms | Privacy | Social | ©2014 Purple Inc.