HW19.sol - homework 19 RAHMAN, TARIQUE Due: Apr 11 2008,...

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: homework 19 RAHMAN, TARIQUE Due: Apr 11 2008, 3:00 am 1 Question 1, chap 14, sect 1. part 1 of 1 10 points Consider the wheel-and-axle system shown below. a b m 1 m 2 Which of the following expresses the con- dition required for the system to be in static equilibrium? 1. am 2 = bm 1 2. am 1 = bm 2 correct 3. a 2 m 1 = b 2 m 2 4. b 2 m 1 = a 2 m 2 5. m 1 = m 2 Explanation: In equilibrium, the total torque is zero, which gives am 1 = bm 2 . Question 2, chap 14, sect 1. part 1 of 1 10 points Consider a solid sphere of radius R and mass m held against a wall by a string being pulled at an angle . mg P F R Determine the torque equation about the point P . 1. Rmg = (1 + sin ) RF correct 2. Rmg = (2- sin ) RF 3. Rmg = (1 + cos ) RF 4. Rmg = RF 5. Rmg = (2- cos ) RF 6. Rmg = 2 cos RF 7. Rmg = 2 sin RF Explanation: mg P F A About P, the clockwise torque is, cw = AP F , where AP = R ( 1 + sin ) and the clockwise torque, ccw = Rmg . Therefore Rmg = (1 + sin ) RF . homework 19 RAHMAN, TARIQUE Due: Apr 11 2008, 3:00 am 2 Question 3, chap 14, sect 1. part 1 of 1 10 points Consider a solid sphere of radius R and mass m placed in a wedge, where one wall is vertical and the other wall has an angle with respect to the vertical wall. m R A B Assuming that the walls are smooth, which expression is appropriate if you consider a free body diagram for the ball which involves F A and F B , the forces acting on the contact points A and B, respectively, and the weight mg ? 1. mg = 2 F A sin 2. mg = F A tan correct 3. mg = F A sin 4. mg = 1 2 F A sin 5. mg = 2 F A tan 6. mg = 2 F A cos 7. mg = 1 2 F A cos 8. mg = F A cos 9. mg = 1 2 F A tan Explanation: The free body diagram is F A F B F B mg F A mg The three forces form a right triangle with F B as the hypotenuse, so tan = mg F A mg =...
View Full Document

Page1 / 6

HW19.sol - homework 19 RAHMAN, TARIQUE Due: Apr 11 2008,...

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