With a pulley system, a force of only 50 lb can lift a 500-lb weight. what is the mechanical advantage if this system is 100% efficient? ma = 10 5 .10

Mechanical advantage of a pulley system is the ratio of load to effort. That is,

M.A = Load/Effort

We have,

Effort = Force applied = 50 lb

Load = Weight lifted = 500 lb

Substituting the values we get,

M.A = = 10

Mechanical advantage of the given pulley system is 10.

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the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.