Physics
The work done by the string of a simple pendulum during one complete oscillation is equal to

Zero
Kinetic energy of the pendulum
Potential energy of the pendulum
Total energy of the pendulum

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The pressure at high altitudes is greater than that on the plains
The pressure of blood in capillaries is greater than the outside pressure
The blood pressure fluctuates and finally decreases drastically
The blood pressure of a person increases at high altitudes

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