44. Products of scalar and vector functions Suppose that the sca- lar function u(t) and the vector function r(t) are both defined for a

Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
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Chapter9: Vectors In Two And Three Dimensions
Section9.FOM: Focus On Modeling: Vectors Fields
Problem 12P
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44. Products of scalar and vector functions Suppose that the sca-
lar function u(t) and the vector function r(t) are both defined for
a <t< b.
a. Show that ur is continuous on [a, b] if u and r are continu-
ous on [a, b] .
b. If u and r are both differentiable on [a, b], show that ur is
differentiable on [a, b] and that
dr
du
(ur) = u
+ r
dt
dt
dt
Transcribed Image Text:44. Products of scalar and vector functions Suppose that the sca- lar function u(t) and the vector function r(t) are both defined for a <t< b. a. Show that ur is continuous on [a, b] if u and r are continu- ous on [a, b] . b. If u and r are both differentiable on [a, b], show that ur is differentiable on [a, b] and that dr du (ur) = u + r dt dt dt
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