Physics-
General
Easy
Question
A system of uniform cylinders and plates is shown. All the cylinders are identical and there is no slipping at any contact. Velocity of lower & upper plate is V and 2V respectively as shown. Then the ratio of angular speed of the upper cylinders to lower cylinders is
- 1/3
- 3
- 1
- none of these
The correct answer is: none of these
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In figure 1, the winch is mounted on an axle, and the 6-sided nut is welded to the winch. By turning the nut with a wrench, a person can rotate the winch. For instance, turning the nut clockwise lifts the block off the ground, because more and more rope gets wrapped around the winch. Three students agree that using a longer wrench makes it easier to turn the winch. But they disagree about why. All three students are talking about the case where the winch is used, over a 10-second time interval, to lift the block one meter off the ground.
Student 1 By using a longer wrench, the person decreases the average force he must exert on the wrench, in order to lift the block one meter in ten seconds.
Student 2 Using a longer wrench reduces the work done by the person as he uses the winch to lift the block one meter in ten seconds.
Student 3 Using a longer wrench reduces the power that the person must exert to lift the block one meter in ten seconds. (Wrench turns winch clockwise) Figure 1 Figure 2
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In figure 1, the winch is mounted on an axle, and the 6-sided nut is welded to the winch. By turning the nut with a wrench, a person can rotate the winch. For instance, turning the nut clockwise lifts the block off the ground, because more and more rope gets wrapped around the winch. Three students agree that using a longer wrench makes it easier to turn the winch. But they disagree about why. All three students are talking about the case where the winch is used, over a 10-second time interval, to lift the block one meter off the ground.
Student 1 By using a longer wrench, the person decreases the average force he must exert on the wrench, in order to lift the block one meter in ten seconds.
Student 2 Using a longer wrench reduces the work done by the person as he uses the winch to lift the block one meter in ten seconds.
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Student 1 is:
In figure 1, the winch is mounted on an axle, and the 6-sided nut is welded to the winch. By turning the nut with a wrench, a person can rotate the winch. For instance, turning the nut clockwise lifts the block off the ground, because more and more rope gets wrapped around the winch. Three students agree that using a longer wrench makes it easier to turn the winch. But they disagree about why. All three students are talking about the case where the winch is used, over a 10-second time interval, to lift the block one meter off the ground.
Student 1 By using a longer wrench, the person decreases the average force he must exert on the wrench, in order to lift the block one meter in ten seconds.
Student 2 Using a longer wrench reduces the work done by the person as he uses the winch to lift the block one meter in ten seconds.
Student 3 Using a longer wrench reduces the power that the person must exert to lift the block one meter in ten seconds. (Wrench turns winch clockwise) Figure 1 Figure 2
Student 1 is:
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