Homework Answers
(a)
units of axy = N
unit of x , y = m
a*m*m = kg m /s^2
a = kg m^-1 s^-2
unit of by = N
b*m = kg m s-2
b = kg s-2
=======================
(b)
from origin to (5,0)
along this line y = 0
F = 0
W = 0
towards north
x = 5
F = 7*5*y i + 4y j
F = 30y i + 4y j
work = F.r
r = yj
W = 4y^2 J = 4*3^2 J
W = 36 J
Wtotal = 36 J
================
(c)
towards north
x = 0
F = by j = 4y j
r = y j
W = F.r = 4y^2 J
W = 4*3^2 = 36 J
towards east
y = 3
F = 21x i + 12 j
r = xi
W = 21x^2 J
W = 21*5^2 = 525 J
Wtotal = 561 J
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