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- Thread starter prudenteyes
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i posted it already u search da forum!!!

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I have just been through the forum and I can not find it. Can you please repost it here? Please???

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here it is

1. mass of an apple: 50 – 500g

2. no of joules of energy in 1kWh = 3 – 4 J

3. wavelength of red light in a vacuum = 6 – 8 (x 107) m

4. pressure due to depth of 10m of water = (5x 104) - (5 x 105) Pa

5. speed of sound in air = 100 – 900 m/s

6. density of air at rtp = 0.5 – 1.5 kg/m3

7. mass of a protractor = 5 – 50g

8. volume in cm3 of head of an adult person = 2 – 9 (x 10-3)

9. frequency of audible sound = 20Hz – 20 kHz

10. wavelength in nm of UV = 10 – 400nm

11. mass of a plastic 30cm ruler = 10 – 100g

12. density of air at atm = 0.1 – 10 kg/m3

13. thickness of a sheet of paper = 0.05 – 0.15mm

14. time for sound 2 travel 100m in air = 0.25 – 0.5s

15. weight of 1000cm3 of water = 8 – 12 N

16. mass of an orange = 100 – 150g

17. mass of an adult human = 50 – 100 kg

18. height of a room in a house = 2 – 3m

19. diameter of a pencil = .5 – 1cm

20. volume of a small bean = 0.5cm3

21. volume of a human head = 4 x 10-3m3

22. the speed of a jumbo jet = 220m/s

23. the temperature of a human body = 310K

24. dis. of earth to the sun = 1.5 x 1011m

25. length of a car = 4m

26. diameter of a hair = 5 x 10-4m

27. diameter of an atom = 3 x 10-10m

28. diameter of a nucleus = 6 x 10-15m

29. typical car speed = 22m/s

30. walking speed = 1.5m/s

31. snail’s speed = .001m/s

32. earth around sun speed = 30000m/s

33. acceleration of family car = 2m/s2

34. acc of freefall on moon = 2m/s2

35. energy released from 100kg of coal = 1010J

36. beat of heart energy = 1J

37. burning of a match energy = 1000J

38. sound of speech on ear for 1sec = .001J

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Can you or someone else please tell me how many antinodes make one wave length? And how many nodes make one wavelength?

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3 antinodes=1 wavelengthprudenteyes said:

Can you or someone else please tell me how many antinodes make one wave length? And how many nodes make one wavelength?

3nodes=1wavelength!

its 3! sorry!

isn't it 3?? :shock:princesszahra said:2 antinodes=1 wavelengthprudenteyes said:

Can you or someone else please tell me how many antinodes make one wave length? And how many nodes make one wavelength?

2 nodes=1wavelength!

I think energy released from 100kg of coal is much more than 1010 J, as seeing that a match releases 1000J O_Oworkinghard said:

here it is

1. mass of an apple: 50 – 500g

2. no of joules of energy in 1kWh = 3 – 4 J

3. wavelength of red light in a vacuum = 6 – 8 (x 107) m

4. pressure due to depth of 10m of water = (5x 104) - (5 x 105) Pa

5. speed of sound in air = 100 – 900 m/s

6. density of air at rtp = 0.5 – 1.5 kg/m3

7. mass of a protractor = 5 – 50g

8. volume in cm3 of head of an adult person = 2 – 9 (x 10-3)

9. frequency of audible sound = 20Hz – 20 kHz

10. wavelength in nm of UV = 10 – 400nm

11. mass of a plastic 30cm ruler = 10 – 100g

12. density of air at atm = 0.1 – 10 kg/m3

13. thickness of a sheet of paper = 0.05 – 0.15mm

14. time for sound 2 travel 100m in air = 0.25 – 0.5s

15. weight of 1000cm3 of water = 8 – 12 N

16. mass of an orange = 100 – 150g

17. mass of an adult human = 50 – 100 kg

18. height of a room in a house = 2 – 3m

19. diameter of a pencil = .5 – 1cm

20. volume of a small bean = 0.5cm3

21. volume of a human head = 4 x 10-3m3

22. the speed of a jumbo jet = 220m/s

23. the temperature of a human body = 310K

24. dis. of earth to the sun = 1.5 x 1011m

25. length of a car = 4m

26. diameter of a hair = 5 x 10-4m

27. diameter of an atom = 3 x 10-10m

28. diameter of a nucleus = 6 x 10-15m

29. typical car speed = 22m/s

30. walking speed = 1.5m/s

31. snail’s speed = .001m/s

32. earth around sun speed = 30000m/s

33. acceleration of family car = 2m/s2

34. acc of freefall on moon = 2m/s2

35. energy released from 100kg of coal = 1010J

36. beat of heart energy = 1J

37. burning of a match energy = 1000J

38. sound of speech on ear for 1sec = .001J

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i wrote in ms word format with powers

n here it changed sorry :sorry:

ll upload da doc wait!!!

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8. volume in cm3 of head of an adult person = 2 – 9 (x 10-3)

Is this in cm3 or dm3 ?