mass of the load

[cm304eex]

Hi all I am having a really dumb moment and can not tanspose tis formula correctly any help would be fab!

An elctric hoist on a side of a building lifts a quantity of electrical equipment through a distance of 45m in 3.5 mins the motor rating of the hoist is 189.19w

Calculate the mass of the load

bad day explodebad day explode

 

[PC Electrics]

90kg

I'll tell you how provided that's correct.

 

[cm304eex]

That's correct pl tell meheadbang

 

[PC Electrics]

We are assuming that the motor rating in this instance is it's output.

We are also ignoring other small losses in the system.

So,

the output of the motor x run time = energy output of motor

and

increase in potential energy of the load = mass x acc'n due to gravity x lift height

and, in this case

energy output of motor = increase in potential energy of the load

and don't forget run time needs to be in seconds.

Pt=mgh

m=(Pt)/(gh)

 

[cm304eex]

Thanks for thatApplaud Smiley Applaud Smiley Applaud Smiley