Lesson_4.4_Homework

# Lesson_4.4_Homework - 1.0 m The figure above shows a...

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Lesson 18 Homework: 1. A 30-kg child sits on a seesaw 1.5 m from the pivot point. How far from the pivot point on the other side will his 45-kg friend has to sit for the seesaw to be in equilibrium? 2. A force of 36 N is applied to a particle located 0.22 m from its axis of rotation. What is the magnitude of the torque about this axis if the angle between the direction of the force and the torque arm is (i) 60 o , (ii) 90 o ? 3. A uniform meter ruler is pivoted at its center with a 150 g mass suspended from the 30 cm mark. (i) At what position should a 100 g mass be placed to keep the system in equilibrium? (ii) What mass would have to be placed at the 80-cm mark for the system to be in equilibrium? 4. A 70.0-kg adult sits at one end of 10.0-m board that has a mass of 8 kg. A 22.0-kg child sits on the other end of the board. Where should the pivot be placed so that the board is balanced? 5. 2.5 m 1.5 m 0.5 m

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Unformatted text preview: 1.0 m The figure above shows a 25.0-kg table. How close to the edge of the table can a 70.0-kg man sit without tipping it over? 6. A 200-g meter stick is hung horizontally by two vertical strings, one at the 0-cm mark and the other at the 80-cm mark. (i) Find the tension in each of the strings. (ii) Find the tension in each of the strings when a 100-g mass is hung from the 40-cm mark. 7. 2.0 m 1.5 m 37 o A 10-kg store sign hangs from a 12-kg beam attached to a vertical wall and supported by a cable as shown in the figure above. Find the tension in the supporting cable and the force exerted by the wall on the beam. 8. R h F A cylinder of radius R and mass M is is resting against a step of height h. The cylinder remains at rest when a force F is applied tangential to the top of the cylinder. What is the minimum value of F which will roll the cylinder over the step without slipping at the corner?...
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Lesson_4.4_Homework - 1.0 m The figure above shows a...

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