GO A rectangular block, with face lengths a = 35 cm and b = 45 cm, is to be suspended on a thin horizontal rod running through a narrow hole in the block. The block is then to be set swinging about the rod like a pendulum, through small angles so that it is in SHM . Figure 15-45 shows one possible position of the hole, at distance r from the block’s center, along a line connecting the center with a corner. (a) Plot the period versus distance r along that line such that the minimum in the curve is apparent. (b) For what value of r does that minimum occur? There is a line of points around the block’s center for which the period of swinging has the same minimum value. (c) What shape does that line make? Figure 15-45 Problem 48.
GO A rectangular block, with face lengths a = 35 cm and b = 45 cm, is to be suspended on a thin horizontal rod running through a narrow hole in the block. The block is then to be set swinging about the rod like a pendulum, through small angles so that it is in SHM . Figure 15-45 shows one possible position of the hole, at distance r from the block’s center, along a line connecting the center with a corner. (a) Plot the period versus distance r along that line such that the minimum in the curve is apparent. (b) For what value of r does that minimum occur? There is a line of points around the block’s center for which the period of swinging has the same minimum value. (c) What shape does that line make? Figure 15-45 Problem 48.
GO A rectangular block, with face lengths a = 35 cm and b = 45 cm, is to be suspended on a thin horizontal rod running through a narrow hole in the block. The block is then to be set swinging about the rod like a pendulum, through small angles so that it is in SHM. Figure 15-45 shows one possible position of the hole, at distance r from the block’s center, along a line connecting the center with a corner. (a) Plot the period versus distance r along that line such that the minimum in the curve is apparent. (b) For what value of r does that minimum occur? There is a line of points around the block’s center for which the period of swinging has the same minimum value. (c) What shape does that line make?
Figure 15-45 Problem 48.
Definition Definition Special type of oscillation where the force of restoration is directly proportional to the displacement of the object from its mean or initial position. If an object is in motion such that the acceleration of the object is directly proportional to its displacement (which helps the moving object return to its resting position) then the object is said to undergo a simple harmonic motion. An object undergoing SHM always moves like a wave.
054 O In Fig. 15-49a, a metal plate is mounted on an axle through
its center of mass. A spring with k = 2000 N/m connects a wall with a
point on the rim a distance r= 2.5 cm from the center of mass
Initially the spring is at its rest length. If the plate is rotated by 7° and
released, it rotates about the axle in SHM, with its angular position
given by Fig. 15-49b.The horizontal axis scale is set by t, = 20 ms. What
is the rotational inertia of the plate about its center of mass?
e (deg)
t (ms)
10
(a)
(6)
052 Go The 3.00 kg cube in Fig. 15-47 has edge
lengths d = 6.00 cm and is mounted on an axle
through its center. A spring (k = 1200 N/m) con-
nects the cube's upper corner to a rigid wall.
Initially the spring is at its rest length. If the cube
is rotated 3° and released, what is the period of
the resulting SHM?
18-51. The uniform garage door has a mass of 150 kg and
is guided along smooth tracks at its ends. Lifting is done
using the two springs, each of which is attached to the
anchor bracket at A and to the counterbalance shaft at B
and C. As the door is raised, the springs begin to unwind
from the shaft, thereby assisting the lift. If each spring
provides a torsional moment of M= (0.70) N - m, where 6 is
in radians, determine the angle 6, at which both the left-
wound and right-wound spring should be attached so that
the door is completely balanced by the springs, i.e., when
the door is in the vertical position and is given a slight force
upward, the springs will lift the door along the side tracks to
the horizontal plane with no final angular velocity. Note:
The elastic potential energy of a torsional spring is
V. =ko², where M = k® and in this case k = 0.7 N - m/rad.
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