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3. Two weights are connected by a very light flexible cord that passes over a Wpulley = 40.0-N frictionless pulley of radius R = 0.400 m. The pulley is a solid uniform disk and is supported by a hook connected to the ceiling (Figure 2). What force does the ceiling exert on the hook? Express first your answers in terms of any or all of the variables Wpulley, WA, WB, R and g (acceleration due to gravity), and then their numerical values. 4. A large wooden turntable in the shape of a flat uniform disk has a radius of 2.00 m WA = 75.0 N 125 N = WB Figure 2

3. Two weights are connected by a very light flexible cord that passes over a Wpulley = 40.0-N frictionless pulley of radius R = 0.400 m. The pulley is a solid uniform disk and is supported by a hook connected to the ceiling (Figure 2). What force does the ceiling exert on the hook? Express first your answers in terms of any or all of the variables Wpulley, WA, WB, R and g (acceleration due to gravity), and then their numerical values. 4. A large wooden turntable in the shape of a flat uniform disk has a radius of 2.00 m WA = 75.0 N 125 N = WB Figure 2

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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66°F Sunny Read aloud 1 of 1 200 2. An experimental bicycle wheer is placed on a test stand so that it is free to turn on its axle. If a constant net torque of 5.00 N·m is applied to the tire for 2.00 s, the angular speed of the tire increases from 0 to 100 rev/min. The external torque is then removed, and the wheel is brought to rest by friction in its bearings in 125 s. Assume the direction the wheel is rotating is the positive direction. A) Compute the moment of inertia of the wheel about the rotation axis. B) Compute the friction torque. C) Compute the total number of revolutions made by the wheel in the 125-s time interval. + 3. Two weights are connected by a very light flexible cord that passes over a Wpulley = 40.0-N frictionless pulley of radius R = 0.400 m. The pulley is a solid uniform disk and is supported by a hook connected to the ceiling (Figure 2). What force does the ceiling exert on the hook? Express first your answers in terms of any or all of the variables Wpulley, WA, WB, R and g (acceleration due to gravity), and then their numerical values. 125 N = WB Figure 2 WA = 75.0 N 4. A large wooden turntable in the shape of a flat uniform disk has a radius of 2.00 m and a total mass of 120 kg. The turntable is initially rotating at 3.00 rad/s about a vertical axis through its center. Suddenly, a 70.0-kg parachutist makes a soft landing on the turntable at a point near the outer edge. A) Find the angular speed of the turntable after the parachutist lands. (Assume that you can treat the parachutist as a particle.) B) Compute the kinetic energy of the system before and after the parachutist lands. Why are these kinetic energies not equal? 5. A worker wants to turn over a uniform, 1250-N, rectangular crate by pulling at 53.0° on one of its vertical sides (Fig. P11.69). The floor is rough enough to prevent the crate from slipping. A) What pull is needed to just start the crate to tip? B) How hard does the floor much unword on the custo? Find the friction foron on the custo n What is the minimu Search lip Im Pull 53.00 2.20 m 1.50 m ENG 60 11:06 5/15/2
Transcribed Image Text:66°F Sunny Read aloud 1 of 1 200 2. An experimental bicycle wheer is placed on a test stand so that it is free to turn on its axle. If a constant net torque of 5.00 N·m is applied to the tire for 2.00 s, the angular speed of the tire increases from 0 to 100 rev/min. The external torque is then removed, and the wheel is brought to rest by friction in its bearings in 125 s. Assume the direction the wheel is rotating is the positive direction. A) Compute the moment of inertia of the wheel about the rotation axis. B) Compute the friction torque. C) Compute the total number of revolutions made by the wheel in the 125-s time interval. + 3. Two weights are connected by a very light flexible cord that passes over a Wpulley = 40.0-N frictionless pulley of radius R = 0.400 m. The pulley is a solid uniform disk and is supported by a hook connected to the ceiling (Figure 2). What force does the ceiling exert on the hook? Express first your answers in terms of any or all of the variables Wpulley, WA, WB, R and g (acceleration due to gravity), and then their numerical values. 125 N = WB Figure 2 WA = 75.0 N 4. A large wooden turntable in the shape of a flat uniform disk has a radius of 2.00 m and a total mass of 120 kg. The turntable is initially rotating at 3.00 rad/s about a vertical axis through its center. Suddenly, a 70.0-kg parachutist makes a soft landing on the turntable at a point near the outer edge. A) Find the angular speed of the turntable after the parachutist lands. (Assume that you can treat the parachutist as a particle.) B) Compute the kinetic energy of the system before and after the parachutist lands. Why are these kinetic energies not equal? 5. A worker wants to turn over a uniform, 1250-N, rectangular crate by pulling at 53.0° on one of its vertical sides (Fig. P11.69). The floor is rough enough to prevent the crate from slipping. A) What pull is needed to just start the crate to tip? B) How hard does the floor much unword on the custo? Find the friction foron on the custo n What is the minimu Search lip Im Pull 53.00 2.20 m 1.50 m ENG 60 11:06 5/15/2
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