The Figure shows a meter stick with the rotation axis at the midpoint. An unknown third mass hung at the 85 cm mark on the stick puts it in static equilibrium. What is the value of the third mass? 20 50 85 100 50 g 150 g 2? m, m2 m3 Hint: Set the net torque equal to zero and solve as demonstrated in Lecture. Label the Figure carefully or you will be lost, lost, lost. O 157 g O 82 g O 200 g O 65 g

The Figure shows a meter stick with the rotation axis at the midpoint. An unknown third mass hung at the 85 cm mark on the stick puts it in static equilibrium. What is the value of the third mass? 20 50 85 100 50 g 150 g 2? m, m2 m3 Hint: Set the net torque equal to zero and solve as demonstrated in Lecture. Label the Figure carefully or you will be lost, lost, lost. O 157 g O 82 g O 200 g O 65 g

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter11: Angular Momentum

Section: Chapter Questions

Problem 88AP: Suppose you start an antique car by exerting a force of 300 N on its crank for 0.250 s. What is the...

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A rigid body is rotating counterclockwise about a fixed axis. Each of the following pairs of quantities represents an initial angular position and a final angular position of the rigid body. Which of the sets can occur only if the rigid body rotates through more than 180? (a) 3 rad, 6 rad; (b) 1 rad, 1 rad; (c) 1 rad, 5 rad.
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Find the net torque on the wheel in Figure P10.23 about the axle through O, taking a = 10.0 cm and b = 25.0 cm. Figure P10.23
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Under what conditions can a rotating body be in equilibrium? Give an example.
A baseball catcher extends his arm straight up to catch a fast ball with a speed of 40 m/s. The baseball is 0.145 kg and the catcher’s arm length is 0.5 m and mass 4.0 kg. (a) What is the angular velocity of the arm immediately after catching the ball as measured from the arm socket? (b) What is the torque applied if the catcher stops the rotation of his arm 0.3 s after catching the ball?
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Suppose you start an antique car by exerting a force of 300 N on its crank for 0.250 s. What is the angular momentum given to the engine if the handle of the crank is 0.300 m from the pivot and the force is exerted to create maximum torque the entire time?
Suppose you start an antique car by exerting a force of 300 N on its crank for 0.250 s. What angular momentum is given to the engine if the handle of the crank is 0.300 m from the pivot and the force is exerted to create maximum torque the entire time?
An automobile engine can produce 200 N m of torque. Calculate the angular acceleration produced if 95.0% of this torque is applied to the drive shaft, axle, and rear wheels of a car, given the following information. The car is suspended so that the wheels can turn freely. Each wheel acts like a 15.0 kg disk that has a 0.180 m radius. The walls of each tire act like a 2.00-kg annular ring that has inside radius of 0.180 m and outside radius of 0.320 m. The tread of each tire acts like a 10.0-kg hoop of radius 0.330 m. The 14.0-kg axle acts like a rod that has a 2.00-cm radius. The 30.0-kg drive shaft acts like a rod that has a 3.20-cm radius.
Repeat Example 10.15 in which the stick is free to have translational motion as well as rotational motion.