Two vectors are shown. Which statement best compares the vectors?
2 answers:
Answer:
Vectors Y has greater magnitude than vector X
Explanation:
The attached figure shows two vectors. A vector have both magnitude and direction.
The length of vector X is less than vector Y. They both are pointing in opposite directions.
The magnitude of a vector is given by :
a = xi +yj
From the figure, it is clear that the vector Y has greater magnitude than vector X. Hence, the correct option is (B).
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Answer
Any force greater 490N
Explanation
The force required just to make an object slide over a rough horizontal surface is any force greater that the static friction which given by;
Given;
Hence;
F = 0.5 x 100 x 9.8
F = 490N.
We will only need the coefficient of kinetic friction if we were asked to find the force required to keep the object moving uniformly. Usually, the force needed to keep an object moving uniformly over a rough surface is lesser that which is needed to start its motion.
In this problem, we were only asked to find the minimum force required to make the object move which we have done.