Practice Homework 11 - practice 11 ALIBHAI, ZAHID 1 Latest...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: practice 11 ALIBHAI, ZAHID 1 Latest unpenalized work: Apr 8 2007 Sunday 04:00 (after this date you can not make a perfect score). Work cutoff: Apr 8 2007, 4:00 am. Question 1 part 1 of 1 10 points Two weights attached to a uniform beam of mass 38 kg are supported in a horizontal position by a pin and cable as shown in the figure. The acceleration of gravity is 9 . 8 m / s 2 . 23 kg 20 kg 2 . 9 m 8 m 37 38 kg What is the tension in the cable which sup- ports the beam? Answer in units of kN. Question 2 part 1 of 3 10 points A uniform rod pivoted at one end point O is free to swing in a vertical plane in a gravitational field. However, it is held in equilibrium by a force F at its other end. x y F F x F y W R x R R y O Force vectors are drawn to scale. What is the condition for translational equilibrium along the horizontal x direction? 1. F x = 0 2.- R x + F x = 0 3. R x- F x cos = 0 4. R x- F x sin = 0 5. F x cos - R x sin = 0 Question 3 part 2 of 3 10 points What is the condition for translational equilibrium along the vertical y direction? 1. R y + F y- W = 0 2. R y- F y + W = 0 3. R y + F y = 0 4. R y sin + F y sin - W cos = 0 5. W- R y + F y = 0 Question 4 part 3 of 3 10 points Taking the origin (point O ) as the pivot point, what is the condition for rotational equilibrium? 1. F y sin - W 2 sin - F x sin = 0 2. F y cos - W 2 cos - F x sin = 0 3. 2 F y sin - W cos - 2 F x sin = 0 4. W 2- F x cos - F y cos = 0 5. F y cos - W sin + F x sin = 0 Question 5 part 1 of 1 10 points A light string has its ends tied to two walls practice 11 ALIBHAI, ZAHID 2 separated by a distance equal to four-fifth the length L of the string as shown in the figure. A 25 kg mass is suspended from the center of the string, applying a tension in the string. The acceleration of gravity is 9 . 8 m / s 2 . 4 L 5 25 kg L 2 L 2 What is the tension in the two strings of length L 2 tied to the wall? Answer in units of N. Question 6 part 1 of 1 10 points A solid bar of length L has a mass m 1 . The bar is fastened by a pivot at one end to a wall which is at an angle with respect to the horizontal. The bar is held horizontally by a vertical cord that is fastened to the bar at a distance x cord from the wall. A mass m 2 is suspended from the free end of the bar. T m 2 m 1 x cord L Find the tension T in the cord. 1. T = parenleftbigg m 1 + 1 2 m 2 parenrightbiggparenleftbigg L x cord parenrightbigg g cos 2. T = parenleftbigg m 1 + 1 2 m 2 parenrightbiggparenleftbigg L x cord parenrightbigg g 3. T = ( m 1 + m 2 ) parenleftbigg L x cord parenrightbigg parenleftBig g 2 parenrightBig 4. T = parenleftbigg 1 2 m 1 + m 2 parenrightbiggparenleftbigg L x cord parenrightbigg g cos 5. T = ( m 1 + m 2 ) g cos 6. T = parenleftbigg m 1 + 1 2 m 2 parenrightbiggparenleftbigg L x cord parenrightbigg g sin 7. T = parenleftbigg 1 2 m 1 + m 2...
View Full Document

This note was uploaded on 10/13/2009 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas at Austin.

Page1 / 9

Practice Homework 11 - practice 11 ALIBHAI, ZAHID 1 Latest...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online