(II) An engineer estimates that under the most adverse expected weather conditions, the total force on the highway sign in Fig. 11–32 will be F → = ( ± 2.4 i ^ − 4.1 j ^ ) kN , acting at the CM. What torque does this force exert about the base О? FIGURE 11–32 Problem 27.
(II) An engineer estimates that under the most adverse expected weather conditions, the total force on the highway sign in Fig. 11–32 will be F → = ( ± 2.4 i ^ − 4.1 j ^ ) kN , acting at the CM. What torque does this force exert about the base О? FIGURE 11–32 Problem 27.
(II) An engineer estimates that under the most adverse expected weather conditions, the total force on the highway sign in Fig. 11–32 will be
F
→
=
(
±
2.4
i
^
−
4.1
j
^
)
kN
, acting at the CM. What torque does this force exert about the base О?
(II) A wheel of diameter 27.0 cm is constrained to rotate in
the xy plane, about the z axis, which passes through its
center. A force F = (-31.0i + 43.4j) N acts at a' point on
the edge of the wheel that lies exactly on the x axis at a
particular instant. What is the torque about the rotation axis
at this instant?
12–163. The car travels along the circular curve having a
radius r = 400 ft. At the instant shown, its angular rate of
rotation is ở = 0.025 rad/s, which is decreasing at the rate
ö = -0.008 rad/s². Determine the radial and transverse
components of the car's velocity and acceleration at this
instant and sketch these components on the curve.
*12–164. The car travels along the circular curve of radius
r = 400 ft with a constant speed of v = 30 ft/s. Determine
the angular rate of rotation ở of the radial line r and the
magnitude of the car's acceleration.
r= 400 ft
(II) A ball of mass M and radius r on the end of a thin
massless rod is rotated in a horizontal circle of radius Ro
about an axis of rotation AB, as shown in Fig. 10-58.
(a) Considering the mass of the ball to be concentrated at
its center of mass, calculate its moment of inertia about AB.
(b) Using the parallel-axis theorem and considering the
finite radius of the ball, calculate the moment of inertia of
the ball about AB. (c) Calculate the percentage error intro-
duced by the point mass approximation for r
1.0 m. s
9.0 cm and
%3D
Ro
to Toinso odt 1s oizs IsB
gadsion ai m
%3D
08.2
(E 10-0
boT
Ro
UKE or da
Problem 89.
► M
10-65
FIGURE 10-58
molecule. The
H bonds
incrtia
Problem 58.
A
gl00A
Chapter 11 Solutions
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