A hinged construction consists of three rhombs with the ratio of sides 3:2:1 (Fig.) Vertex A3 moves in the horizontal direction at a velocity v. Determine the velocities of vertices A1, A2, and B2 at the instant when the angles of the construction are 90 degrees.

You can submit your answers in comments. The students with correct answers will be listed in the winners link at the top of the blog

## Tuesday, July 27, 2010

## Monday, July 12, 2010

### Weekly Challenge 3: Circular Motion

On a certain rough horizontal circular track of Radius R having a constant coefficient of friction, the maximum attainable speed for a cyclist is v

_{o}. A cyclist begins to ride on this track in such a manner as to attain the maximum possible speed in shortest possible time. What will be ratio of his initial tangential acceleration to his tangential acceleration at an instant when he attains a speed of v_{o}/η## Wednesday, July 7, 2010

### Weekly Challenge 2: Projectile Motion: 8/7/2010

A projectile is fired from the top of a tower whose height is unknown. It is found that for a projection speed of 10m/s , the maximum range is obtained at a projection angle of 30

^{o}.What is the maximum range (i.e. from foot of the tower to the landing point on ground) and what is the height of the Tower?## Monday, July 5, 2010

### Online quiz on kinematics, Laws of Motion and Work Power and Energy

**Instructions (Read Carefully):**

1. The quiz will load on this page. Solve all the questions and keep your answers ready on a sheet of paper before copying them to Virtual OMR for instant grading.

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4. After filling the OMR you will be graded instantly by hitting "show me my marks" button

5. To See the Answer Key, You can click here

6. To Time the Test, if you like you can use the following Timer

Online Quiz on Work Power Kinematics_ and Laws of Motion

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