A load of 600N is lifted using a first class lever applying an effort of 350N. If the distance between the fulcrum and the effort is 60cm and the distance between the load and the fulcrum is 30cm, calculate it's efficiency

The efficiency of the machine is 85.5%

Explanation:

Mechanical advantage = Load/Effort

= 600/350 = 1.71

Velocity ratio = distance moved by effort/distance moved by load

= 60/30 = 2

Efficiency = (M.A/V.R) × 100%

= (1.71/2) × 100

= 0.855 × 100

= 85.5%

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

i just did an experiment like this in my science class. also the answer is yes, it will get separated because they are two opposites meaning if they are opposite they can not attract.

hope this .!