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8. What is the torque on a bolt applied with a wrench that has a lever arm of 30 cm with a force of 30N? C. 90 Nm D. 120 Nm A. 3 Nm B. 9 Nm

8. What is the torque on a bolt applied with a wrench that has a lever arm of 30 cm with a force of 30N? C. 90 Nm D. 120 Nm A. 3 Nm B. 9 Nm

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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1. Multiple Choice Directions: Read the items very carefully and select the letter of the correct answer. Justify your answers by providing short discussions or solutions. 1. If an object of radius 3 m that experiences a constant angular acceleration starting from rest, rotates 10 rads in 2s, what is its angular acceleration? A. 2.5 rad/s? B. 5.0 rad/s? C. 10 rad/s? D. 15 rad/s? 2. From question number 1, what is the magnitude of the linear acceleration? A. 1.6 m/s? В. 5 m/s? C. 15 m/s? D. 30 m/s? 3. A uniform wooden board of mass 10 M is held by a nail hammered into a wall. A block of mass M rests L/2 Pivot away from the pivot. Another block of a certain mass is hung a distance L/3. The system is in static equilibrium. (M) C. IM D. 2M A. 2 в. 4. The angular velocity of a rotating disk with a radius of 2 m decreases from 6 rads per second to 3 rads per second in 2 seconds. What is the linear acceleration of a point on the edge of the disk during this time interval? A. - 1 m/s? B. -3 m/s? С. 32 m/s? D. 3 m/s? 5. The positions of the masses 2 kg, 3 kg, 4 kg, and 5 kg are placed like on the figure. What is the center of mass of the system? A. (0,0) B. (0,4) C. (1,2) D. (4,0) 24
Transcribed Image Text:1. Multiple Choice Directions: Read the items very carefully and select the letter of the correct answer. Justify your answers by providing short discussions or solutions. 1. If an object of radius 3 m that experiences a constant angular acceleration starting from rest, rotates 10 rads in 2s, what is its angular acceleration? A. 2.5 rad/s? B. 5.0 rad/s? C. 10 rad/s? D. 15 rad/s? 2. From question number 1, what is the magnitude of the linear acceleration? A. 1.6 m/s? В. 5 m/s? C. 15 m/s? D. 30 m/s? 3. A uniform wooden board of mass 10 M is held by a nail hammered into a wall. A block of mass M rests L/2 Pivot away from the pivot. Another block of a certain mass is hung a distance L/3. The system is in static equilibrium. (M) C. IM D. 2M A. 2 в. 4. The angular velocity of a rotating disk with a radius of 2 m decreases from 6 rads per second to 3 rads per second in 2 seconds. What is the linear acceleration of a point on the edge of the disk during this time interval? A. - 1 m/s? B. -3 m/s? С. 32 m/s? D. 3 m/s? 5. The positions of the masses 2 kg, 3 kg, 4 kg, and 5 kg are placed like on the figure. What is the center of mass of the system? A. (0,0) B. (0,4) C. (1,2) D. (4,0) 24
6. Ball A and Ball B are connected by a 45-centimeter rod with negligible mass. The axis of rotation is located at 30 cm from ball B. If Ball A has a mass of 100 kg and the moment of inertia of the 2 balls is 29 kgm², what is the mass of Ball B? A. 200 kg B. 250 kg с. 300 kg D. 350 kg 7. A uniform meterstick is supported at the 50 cm mark. A 25N weight is placed at the 10 cm mark. Where should a 200N weight be placed for the meter stick to be in equilibrium? A. 1.25 cm mark B. 45.5 cm mark C. 51.3 cm mark D. 80.0 cm mark 8. What is the torque on a bolt applied with a wrench that has a lever arm of 30 cm with a force of 30N? C. 90 Nm D. 120 Nm А. 3 Nm B. 9 Nm 9. A uniform rod of length 1.5 m and a mass of 0.80 kg is attached to one end to a hinge on a vertical wall. The rod makes an angle of 60° above the horizontal. What is the magnitude of the torque about the hinge from the rod's weight? A. 0.75 N В. 2.9N C. 5.8 N D. 10.3 N
Transcribed Image Text:6. Ball A and Ball B are connected by a 45-centimeter rod with negligible mass. The axis of rotation is located at 30 cm from ball B. If Ball A has a mass of 100 kg and the moment of inertia of the 2 balls is 29 kgm², what is the mass of Ball B? A. 200 kg B. 250 kg с. 300 kg D. 350 kg 7. A uniform meterstick is supported at the 50 cm mark. A 25N weight is placed at the 10 cm mark. Where should a 200N weight be placed for the meter stick to be in equilibrium? A. 1.25 cm mark B. 45.5 cm mark C. 51.3 cm mark D. 80.0 cm mark 8. What is the torque on a bolt applied with a wrench that has a lever arm of 30 cm with a force of 30N? C. 90 Nm D. 120 Nm А. 3 Nm B. 9 Nm 9. A uniform rod of length 1.5 m and a mass of 0.80 kg is attached to one end to a hinge on a vertical wall. The rod makes an angle of 60° above the horizontal. What is the magnitude of the torque about the hinge from the rod's weight? A. 0.75 N В. 2.9N C. 5.8 N D. 10.3 N
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