1. A massless wire connects two masses, one of which is exactly twice the other. If the connecting wire has length L, should a support be placed at a distance L/3 from the larger mass to achieve equilibrium? The mass of the wire is assumed to be negligible. 2. Are projectiles subject to constant acceleration in two dimensions? 3. Explain in detail why a spinning ice-skater's angular speed increases when she pulls in her arms closer to her body. 4. Stand facing the edge of an open door, one foot on each side of the door. You will find that you are not able to stand on your toes. Why? 5. Two identical pool balls are shot directly at one another at the same speed. Describe the ball's motions after they collide, assuming that frictional forces may be neglected and the collision is completely elastic.
Answer the following concisely, in no more than three sentences.
1. A massless wire connects two masses, one of which is exactly twice the other. If the
connecting wire has length L, should a support be placed at a distance L/3 from the larger
mass to achieve equilibrium? The mass of the wire is assumed to be negligible.
2. Are projectiles subject to constant acceleration in two dimensions?
3. Explain in detail why a spinning ice-skater's angular speed increases when she pulls in her
arms closer to her body.
4. Stand facing the edge of an open door, one foot on each side of the door. You will find that
you are not able to stand on your toes. Why?
5. Two identical pool balls are shot directly at one another at the same speed. Describe the ball's
motions after they collide, assuming that frictional forces may be neglected and the collision
is completely elastic.
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