Jewett. serway 일반물리학 physics 7th 7판 솔루션 Vectors
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Jewett. serway 일반물리학 physics 7th 7판 솔루션
1-22장까지 분리해서올려놧습니다
목차
CHAPTER OUTLINE
3.1 Coordinate Systems
3.2 Vector and Scalar Quantities
3.3 Some Properties of Vectors
3.4 Components of a Vector and
Unit Vectors
본문내용
ANSWERS TO QUESTIONS
Q3.1 Only force and velocity are vectors. None of the other
quantities requires a direction to be described. The
answers are (a) yes (b) no (c) no (d) no (e) no
(f ) yes (g) no.
*Q3.2 The magnitudes of the vectors being added are constant,
and we are considering the magnitude only—not the
direction—of the resultant. So we need look only at the
angle between the vectors being added in each case. The
smaller this angle, the larger the resultant magnitude.
Thus the ranking is c = e > a > d > b.
*Q3.3 (a) leftward: negative. (b) upward: positive (c) rightward:
positive (d) downward: negative (e) Depending
on the signs and angles of
A
and
B, the sum could be
in any quadrant. (f) Now −
A
will be in the fourth
quadrant, so − +
A B will be in the fourth quadrant.
*Q3.4 (i) The magnitude is 102 + 102 ms, answer (f ).
(ii) Having no y component means answer (a).
*Q3.5 The vertical component is opposite the 30° angle, so sin 30° = (vertical component)/50 m and the
answer is (h).
*Q3.6 Take the difference of the coordinates of the ends of the vector. Final fi rst means head end fi rst.
(i) −4 − 2 = −6 cm, answer ( j) (ii) 1 − (−2) = 3 cm, answer (c)
Q3.7 (i) If the direction-angle of
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