2. We cannot predict whether the object is charged or not if aluminium strips are replaced with plastic strips, as there will be no divergence of the strips.
3. Yes, there is always friction between a moving train's wheels and the iron rails, Because the wheels are rolling on the track, this friction is known as rolling friction.
If an air cushion is introduced between them it will reduce the friction between the wheels are the iron rail
4. Frequency is 5/10 = 0.5 Hz
Time period is 1/f =1/0.5= 2
5. When the air inside this system is completely removed the person outside won't be able to hea any sounds due to near-empty regions of space inside the system which is vaccum . Sound can only travels through the vibration of atoms and molecules in a medium (such as air or water)
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Answer:
1. A is XX girl
B is XY boy
2. We cannot predict whether the object is charged or not if aluminium strips are replaced with plastic strips, as there will be no divergence of the strips.
3. Yes, there is always friction between a moving train's wheels and the iron rails, Because the wheels are rolling on the track, this friction is known as rolling friction.
If an air cushion is introduced between them it will reduce the friction between the wheels are the iron rail
4. Frequency is 5/10 = 0.5 Hz
Time period is 1/f =1/0.5= 2
5. When the air inside this system is completely removed the person outside won't be able to hea any sounds due to near-empty regions of space inside the system which is vaccum . Sound can only travels through the vibration of atoms and molecules in a medium (such as air or water)
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