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Aliens
They used levers, inclined planes (ramps) and lots of muscle power!
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∙ 12y ago
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What exactly is a jib crane?
A jib crane uses a system of pulleys to lift objects as opposed to a lever, like most standard cranes.
How can cranes lift thing without falling?
because cranes have a counter weight that should weigh more than whatever they are carrying
How do pulleys help us?
By A Sytem of ropes that make it eaiser to lift things that are to heavy to lift without help.
What is the importance of pulley?
pulleys allow you to lift significantly more weight than without them
Why do ski lifts have pulleys?
A ski lift is operated by a pulley; they need them to operate the lift; without them, there would only be a cable and chair lift floating in mid- air
How cranes lift heavy loads without toppling?
Because anticlockwise torque is equal to clockwise torque and therefore the net torque is zero so the crane is in state of equillibrium and also there center of gravity pass through base therefore the cranes lift heavy load without toppling
Why cranes are used to lift heavy objects?
because we can't lift it with our hand
How 2 cranes of 40 tons can lift in tandem one weight of 75 tons?
In practice, the cranes have to be "synchronized" which creates certain problems for controlling the lift. But as 40 + 40 = 80 there is ample overhead whentrying to lift 75 tons. The cranes would each lift opposite sides of the load at the same time.
What are facts about the pulley?
Pulleys are used to lift objects
Why are cranes in steel works often fitted with electromagnet?
Because they can then lift the steel easily without having to put chains and lifting gear onto it.
What does the simple pulley do?
Pulleys are really useful at times because of all the things they can help you with. For example, window blinds. Have you ever even thought about the way the blinds in your window work? They work with pulleys! The small pulley in your window folds the blinds and pulls them up. There are pulleys in elevators, cranes, lifts, wells, dumbwaiters, even tape rolls.
How are cranes advantagous?
Cranes are able to give a number of advantages. The main advantage of cranes is the ability to lift and move things normally too heavy for manual lifting. In addition to lifting cranes can reach high places with ease.
