On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why?
The one which was simply dropped down will reach the ground first. If the height was large enough and measurements very accurate the earth continues to spin. Therefore, this stone will fall directly in a straight line joining the initial point on the centre of the earth but the point on the earth’s surface which was directly below the initial point will have moved. The vertical component of velocity of the other stone, which had been hurled parallel to the earth’s surface, is zero.
However, owing to the sphericity of the earth’s surface together with earth’s spin, it will have to fall greater distance in order to reach earth’s surface. Therefore, it will take longer.
Fill in the gaps in the following table illustrating differences between prokaryotic and eukaryotic cells.
| Prokaryotic Cell | Eukaryotic Cell |
| 1. Size : generally small (1-10 μm) 1 μm = 10-6 m |
1. Size generally large (5-100 μm) |
| 2. Nuclear region: ________________ and known as _________________ |
2. Nuclear region: well defined andsurrounded by a nuclear membrane |
|
3. Chromosome: single |
3. More than one chromosome |
| 4. Membrane-bound cell organelles absent | 4. _______________________ _______________________ |
NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:
Welcome to the NCERT Solutions for Class 9 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 17: On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface w....
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