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| Q. |
Rain drops fall from great height. Which among the following statements is true regarding it? |
| A. | they fall with that ultimate velocity, which are different for different droplets |
| B. | they fall with same ultimate velocity |
| C. | their velocity increases and they fall with different velocity on the earth |
| D. | their velocity increases and they fall with same velocity on the earth |
| Answer» A. they fall with that ultimate velocity, which are different for different droplets | |
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Explanation: Any mass is attracted to the Earth by the pull of gravity. Gravity accelerates all objects towards the ground at a specific rate. Without any other forces present, the speed of an object in free fall will increase the farther or longer it falls. In general the air resistance on an object depends upon several variables. First, it depends upon the shape of the object. Its shape determines the object's drag coefficient: the more aerodynamic the shape, the less drag. Second, it depends upon the size of the object; specifically the cross-sectional area presented to the airflow (perpendicular to the direction of travel). |
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