A rocket is launched the top of a 96 -ft building with an initial velocity of 64 ft/sec. The height h ( t ) of the rocket is given by h ( t ) = − 16 t 2 + 64 t + 96 . Find the time it takes for the rocket to hit the ground. [ H i n t : h ( t ) = 0 whentheobjecthitstheground . ]
A rocket is launched the top of a 96 -ft building with an initial velocity of 64 ft/sec. The height h ( t ) of the rocket is given by h ( t ) = − 16 t 2 + 64 t + 96 . Find the time it takes for the rocket to hit the ground. [ H i n t : h ( t ) = 0 whentheobjecthitstheground . ]
Solution Summary: The author calculates the time taken by the rocket to hit the ground from the top of a 96 ft building.
A rocket is launched the top of a
96
-ft building with an initial velocity of
64
ft/sec. The height
h
(
t
)
of the rocket is given by
h
(
t
)
=
−
16
t
2
+
64
t
+
96
. Find the time it takes for the rocket to hit the ground.
[
H
i
n
t
:
h
(
t
)
=
0
whentheobjecthitstheground
.
]
Let V, W, and Y be vector spaces.
Suppose dim(V) dim(W) = dim(Y) = 2.
=
Let ("beta") be an ordered basis for V.
Let ("gamma") be an ordered basis for W.
Let ("zeta") be an ordered basis for Y.
Suppose S is a linear transformation from V to W and that T is a linear trans-
formation from W to Y.
Remember that ToS is the function from V to Y defined by (TOS)(v) = T(S(v)).
(a) Prove that To S is a linear transformation.
(b) Prove that
°
[T • S] = [T]{[S]}.
Let W={(0, a, 0) | a Є R}.
(a) List four elements from W.
(b) Determine whether W is a subspace of R³, and prove that your answer is
correct.
For this problem, refer to the network as shown in Figure 1, answer the following
questions.
B
A
C
FIGURE 1. For Problem (7).
Let x₁ be the number of users at website A.
Let x2 be the number of users at website B.
Let x3 be the number of users at website C.
Assume that there are a total of 900 users at these three websites. This gives us
the following system of linear equations:
x1 = x2 + 1x3
x2 = x1 + x3
x3 = x2
= 900
x1 + x2 + x3 =
(a) Put this system into a standard form (with all variables on the left side and
with the constants on the right), and convert that system into an augmented
matrix, and then...
(b) Use elementary row operations to put the augmented matrix into reduced row
echelon form, and then...
(c) Write down the solution space for this system of equations, and then...
(d) Identify which website(s) would be ranked most highly by PageRank.
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