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Blocks are used in purchase systems on sailboats so sailors can better control the high amounts of load created by wind and sails. The way to make this difficult task simpler is by designing blocks that run freely and reduce the friction caused by sheets and lines in purchase systems. So what is the difference between ball bearing blocks and non-ball bearing blocks?
Ball Bearing BlockBall bearing blocks are best for any system on your boat that does not see "static loads," or low-movement applications. Examples of a few recommended ball bearing block applications are main, jib, and spinnaker sheeting systems, traveler cars, and controls, and running rigging backstay runner blocks. Compared to non-ball bearing blocks, ball bearing blocks run freely allowing for increased safety and ease of use. Whether cruising or racing-the sailor can only exert a limited amount of power, so ease of operation and ability to release a line and let it run free is very important and is optimized with ball bearing blocks.
Non-Ball Bearing BlocksNon-ball bearing blocks are best fit for applications that hold high static loads and/or only change line direction, such as turning blocks, masts base blocks, deck organizers, halyard blocks, boom vangs, and reefing blocks. In these instances, a simpler, less expensive, non-ball bearing block makes the most sense.
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Which machine has the greatest mechanical efficiency a block and tackle or a lever?
In theory there is no difference in efficiency (it would be 1), but in practice I think a block and tackle would lose more force to friction in the pulleys and between the rope and pulleys.
What are the examples of combination pulleys?
an examle of a doulble pulley is an elevator or a crane in construction building.
Can the pitch slide into home plate to block the plate if he doesn't have the ball?
No. That would be an obstruction and the base-runner would be safe.
How much force is used to lift 100 lbs using 3 pulleys?
Using 3 pulleys in a block and tackle system reduces the force required to lift an object by one-third. Therefore, to lift 100 lbs with 3 pulleys, you would need to apply approximately 33.33 lbs of force.
Can a catcher in slow pitch softball block the plate if theres a play at home?
No player including the catcher is allowed to block the base unless he has the ball. It would be defensive interference and the runner would be safe. The rule is generally not enforced if the ball and the runner arrive at the same time. The reason home plate is somewhat different than second or third is because a runner does not need to remain on home plate where at second and third, overrunning the bag could allow the runner to be tagged out.
Which pully would require more effort force?
Not entirely sure what you mean but maybe this will help: In general the more pulleys you have in your system the less force you will need to apply to lift a certain load, in this case the system of pulleys is generally called a "block and tackle".
What kind of sailboat in Nim's Island?
It's a regular sailboat with everything a regular boat would have
What is the top of a sailboat called?
That would be the deck.
What would happen if a sailboat went to the moon?
it would float
What if pitcher hits batter?
The runner is safe, in order for the runner to be considered out the fielder would have to have the ball in his glove or hand and tag the runner. *edit: It depends on where the runner is when he is hit. If the runner is running a direct path to first and is within the 3ft baseline, the runner is safe. If however the runner takes a lane outside the 3ft path, in a deliberate attempt to block the catcher's throwing lane, the runner is out for Interference.
What is a sailboat the stand on vessel in relations to a recreational power boat?
The question should be "When is the sailboat the stand-on vessel...? The answer is if the sailboat has an engine and if it is in operation, the sailboat is treated as a power boat in determining stand-on status. The right-of-way would then follow the rules for power boats.
What is a double steal?
say there is a runner on 1st and 2nd. the runner on second would run to 3rd and be safe then the runner on 1st would run twould be safeo second and say there is a runner on 1st and 2nd. the runner on second would run to 3rd and be safe then the runner on 1st would run twould be safeo second and
