Does a rigid object in uniform rotation about a fixed axis satisfy the first and second conditions for equilibrium? Why? Does it then follow that every particle in this object is in equilibrium? Explain.
Does a rigid object in uniform rotation about a fixed axis satisfy the first and second conditions for equilibrium? Why? Does it then follow that every particle in this object is in equilibrium? Explain.
Does a rigid object in uniform rotation about a fixed axis satisfy the first and second conditions for equilibrium? Why? Does it then follow that every particle in this object is in equilibrium? Explain.
Expert Solution & Answer
To determine
Whether a rigid object which is uniformly rotated about a fixed axis will satisfy the first and second conditions for equilibrium or not and whether every particle in this object is in equilibrium or not.
Explanation of Solution
Equilibrium defines the state in which all the opposing actions are balanced.
The equilibrium conditions are- first condition is that the vector sum of forces must be zero and the second condition is the sum of torques about any point must be zero.
When a rigid body is uniformly rotated about a fixed axis, then the object does not possess linear motion or translational motion. Thus, it satisfies the first condition of equilibrium.
Since rotational motion is uniform then no torque acts on it. Thus, it satisfies the second condition for equilibrium. Every particle in the rigid object also is in equilibrium because the particles position remains constant and does not get affected by the rotational motion.
Conclusion:
The rigid object is in equilibrium as it satisfies both the condition and every particle of an object satisfies the equilibrium conditions.
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Three slits, each separated from its neighbor by d = 0.06 mm, are illuminated by a coherent light source of
wavelength 550 nm. The slits are extremely narrow. A screen is located L = 2.5 m from the slits. The
intensity on the centerline is 0.05 W. Consider a location on the screen x = 1.72 cm from the centerline.
a) Draw the phasors, according to the phasor model for the addition of harmonic waves, appropriate for this
location.
b) From the phasor diagram, calculate the intensity of light at this location.
A Jamin interferometer is a device for measuring or for comparing the indices of refraction of gases. A beam
of monochromatic light is split into two parts, each of which is directed along the axis of a separate cylindrical
tube before being recombined into a single beam that is viewed through a telescope. Suppose we are given the
following,
•
Length of each tube is L = 0.4 m.
• λ= 598 nm.
Both tubes are initially evacuated, and constructive interference is observed in the center of the field of view. As
air is slowly let into one of the tubes, the central field of view changes dark and back to bright a total of 198
times.
(a) What is the index of refraction for air?
(b) If the fringes can be counted to ±0.25 fringe, where one fringe is equivalent to one complete cycle of
intensity variation at the center of the field of view, to what accuracy can the index of refraction of air be
determined by this experiment?
Chapter 11 Solutions
University Physics with Modern Physics, Volume 1 (Chs. 1-20) (14th Edition)
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