Question
Solve the initial value v=-1 x=1 Find the volume of the solid of re olution formed by rotating y=sqrt (4-x^3) about the xaxis from x=-2 to x=2 (3 marks) Find the is value Vof the iunction y=2x-x (3 marky) Compute the are length y=ln(xecx) 13 marks Venty the theoren f(x)x^2+2x-8.+1 int _(1)^2(1)/(lnx) Trapezoidal rule (iii) (3 marki)
Solution
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(259 Votos)
Benicio
Elite · Tutor por 8 anos
Resposta
To solve the initial value problem, we need to find the solution to the differential equation
with the initial condition
.The general solution to the differential equation
is
, where
is the constant of integration.Using the initial condition
, we can substitute
into the general solution to find the value of
:
Therefore, the solution to the initial value problem is
.To find the volume of the solid of revolution formed by rotating the region
about the x-axis from
to
, we can use the disk method.The volume
is given by the integral:
Simplifying the integrand:
Integrating term by term:
Evaluating the integral:
Therefore, the volume of the solid of revolution is
.To find the solution to the equation
, we can simplify the equation:
Therefore, the solution to the equation is
.To compute the area under the curve
, we can use the definite integral:
Using integration by parts, let
and
. Then
and
.
Simplifying the integral:
Evaluating the integral:
Therefore, the area under the curve
from
to
is
.To evaluate the integral
using the trapezoidal rule, we can divide the interval
into
subintervals of equal width
.The trapezoidal rule formula is:
In this case,
,
, and
. We need to evaluate
at
points
, where
for
.Using the trapezoidal rule, we can approximate the integral:$\int_{1}^{2} \frac{1}{\ln(x)} dx \approx \frac{1}{2n} \left[