Four forces are being applied to move an object to the left. force 1 is pushing to the right at 200 n. force 2 is pushing to the left at 500 n. force 3 is pushing to the right at 100 n. force 4 is pushing to the left at 50 n. what's the net force acting on this object?
a. −250 n
b. 850 n
c. 0 n
d. 250 n

The correct option is A.

Explanation:

Force 1 is pushing to the right at 200 N.

Force 2 is pushing to the left at 500 N.

(negative sign indicates the direction of the force )

Force 3 is pushing to the right at 100 N

Force 4 is pushing to the left at 50 N

(negative sign indicates the direction of the force )

Net force on the object:

-250 N the net force acting on this object.

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"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."