A bicycle is turned upside down while its owner repairs a flat tire on the rear wheel. A friend spins the front wheel, of radius R, and observes that drops of water fly oil tangentially in an upward direction when the drops are at the same level as the center of the wheel. She measures the height reached by drops moving vertically (Fig. P10.74). A drop that breaks loose from the tire on one turn rises a distance h 1 above the tangent point. A drop that breaks loose on the next turn rises a distance h 2 < h 1 above the tangent point. The height to which the drops rise decreases because the angular speed of the wheel decreases. From this information, determine the magnitude of the average angular acceleration of the wheel.
A bicycle is turned upside down while its owner repairs a flat tire on the rear wheel. A friend spins the front wheel, of radius R, and observes that drops of water fly oil tangentially in an upward direction when the drops are at the same level as the center of the wheel. She measures the height reached by drops moving vertically (Fig. P10.74). A drop that breaks loose from the tire on one turn rises a distance h 1 above the tangent point. A drop that breaks loose on the next turn rises a distance h 2 < h 1 above the tangent point. The height to which the drops rise decreases because the angular speed of the wheel decreases. From this information, determine the magnitude of the average angular acceleration of the wheel.
Solution Summary: The author explains the angular acceleration of the wheel. The height of first and second drops is h_1.
A bicycle is turned upside down while its owner repairs a flat tire on the rear wheel. A friend spins the front wheel, of radius R, and observes that drops of water fly oil tangentially in an upward direction when the drops are at the same level as the center of the wheel. She measures the height reached by drops moving vertically (Fig. P10.74). A drop that breaks loose from the tire on one turn rises a distance h1 above the tangent point. A drop that breaks loose on the next turn rises a distance h2 < h1 above the tangent point. The height to which the drops rise decreases because the angular speed of the wheel decreases. From this information, determine the magnitude of the average angular acceleration of the wheel.
Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .
A solid cylinder is released from the top of an inclined plane of height 0.39 m. From what height, in meters, on the incline should a solid sphere of the same mass and radius be released to have the same speed as the cylinder at the bottom of the hill?
a rigid assembly of a thin hoop (of mass m = 0.25 kg and radius R = 0.19 m) and a thin radial rod (of length L = 2R and also of mass m = 0.25 kg). The assembly is upright, but we nudge it so that it rotates around a horizontal axis in the plane of the rod and hoop, through the lower end of the rod. Assuming that the energy given to the assembly in the nudge is negligible, what is the assembly's angular speed about the rotation axis when it passes through the upside-down (inverted) orientation?
A solid sphere, a thin spherical shell, and a solid cylinder each have a radius of 3 cm and a mass of 5 kg. They each start from rest and roll without slipping down a hill with a height of 7 m. Rank the change in potential energy of the objects as they go from the top to the bottom of the hill. (a) ΔPEshell>ΔPEsphere>ΔPEcylΔPEshell>ΔPEsphere>ΔPEcyl (b) ΔPEsphere>ΔPEcyl>ΔPEshellΔPEsphere>ΔPEcyl>ΔPEshell (c) ΔPEshell>ΔPEcyl>ΔPEsphereΔPEshell>ΔPEcyl>ΔPEsphere (d) ΔPEshell=ΔPEsphere=ΔPEcylΔPEshell=ΔPEsphere=ΔPEcyl (e) ΔPEsphere>ΔPEshell>ΔPEcyl
Chapter 10 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
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