For Exercises 97-102, refer to vectors t, u, v, and w in the figure and match each vector with an equivalent vector a-f. a . − t b . 3 u c . w d . u − 2 t e . v f . − 3 u v + w
For Exercises 97-102, refer to vectors t, u, v, and w in the figure and match each vector with an equivalent vector a-f. a . − t b . 3 u c . w d . u − 2 t e . v f . − 3 u v + w
Solution Summary: The author explains that by parallelogram method of addition, the vector v+w can be expressed as, i.e.
For Exercises 97-102, refer to vectors t, u, v, and w in the figure and match each vector with an equivalent vector a-f.
a
.
−
t
b
. 3
u
c
.
w
d
.
u
−
2
t
e
.
v
f
.
−
3
u
v
+
w
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.
Evaluate the integral using integration by parts.
Sx² cos
(9x) dx
Let f be defined as follows.
y = f(x) = x² - 5x
(a) Find the average rate of change of y with respect to x in the following intervals.
from x = 4 to x = 5
from x = 4 to x = 4.5
from x = 4 to x = 4.1
(b) Find the (instantaneous) rate of change of y at x = 4.
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Velocity of a Ball Thrown into the Air The position function of an object moving along a straight line is given by s = f(t). The average velocity of
the object over the time interval [a, b] is the average rate of change of f over [a, b]; its (instantaneous) velocity at t = a is the rate of change of f at a.
A ball is thrown straight up with an initial velocity of 128 ft/sec, so that its height (in feet) after t sec is given by s = f(t) = 128t - 16t².
(a) What is the average velocity of the ball over the following time intervals?
[3,4]
[3, 3.5]
[3, 3.1]
ft/sec
ft/sec
ft/sec
(b) What is the instantaneous velocity at time t = 3?
ft/sec
(c) What is the instantaneous velocity at time t = 7?
ft/sec
Is the ball rising or falling at this time?
O rising
falling
(d) When will the ball hit the ground?
t =
sec
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College Algebra with Modeling & Visualization (5th Edition)
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