What is one advantage a primary source has over a secondary source? A. A primary source always includes several perspectives. B.
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To solve the exercise it is necessary to apply the concepts related to Newton's Second Law, as well as the definition of Weight and Friction Force.
According to the problem there is a movement in the body and it is necessary to make a sum of forces on it, so that
There are two forces acting on the body, the Force that is pushing and the opposing force that is that of friction, that is
To find the required force then,
By definition we know that the friction force is equal to the multiplication between the friction coefficient and the weight, that is to say
Therefore the horizontal force applied on the block is B) 230N
The answer is c. The amount of matter in an object is the concentration of the atoms inside. This can also be called density. Weight depends on density because weight = .