Use the result of Exercise 43(b) to show that if F is a vector field of the form F = f r r and if div F = 0 , then F is an inverse-square field. [ Suggestion : Let r = r and multiply 3 f ( r ) + r f ′ ( r ) = 0 through by r 2 . Then write the result as a derivative of a product.]
Use the result of Exercise 43(b) to show that if F is a vector field of the form F = f r r and if div F = 0 , then F is an inverse-square field. [ Suggestion : Let r = r and multiply 3 f ( r ) + r f ′ ( r ) = 0 through by r 2 . Then write the result as a derivative of a product.]
Use the result of Exercise 43(b) to show that if F is a vector field of the form
F
=
f
r
r
and if div
F
=
0
,
then F is an inverse-square field. [Suggestion:
Let
r
=
r
and multiply
3
f
(
r
)
+
r
f
′
(
r
)
=
0
through by
r
2
.
Then write the result as a derivative of a product.]
Quantities that have magnitude and direction but not position. Some examples of vectors are velocity, displacement, acceleration, and force. They are sometimes called Euclidean or spatial vectors.
Use Euler's method to numerically integrate
dy
dx
-2x+12x² - 20x +8.5
from x=0 to x=4 with a step size of 0.5. The initial condition at x=0 is y=1. Recall
that the exact solution is given by y = -0.5x+4x³- 10x² + 8.5x+1
Find an equation of the line tangent to the graph of f(x) = (5x-9)(x+4) at (2,6).
Find the point on the graph of the given function at which the slope of the tangent line is the given slope.
2
f(x)=8x²+4x-7; slope of the tangent line = -3
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