Reasonable estimates

prudenteyes

Does anyone has the sheet about reasonable estimates??? My sir gave me a sheet where plenty of estimations were given but I sadly lost it. If anybody else has got it please share. I urgently need it!!! Please!

workinghard

i posted it already u search da forum!!!

prudenteyes

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

workinghard

oh k...
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

prudenteyes

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

princesszahra

prudenteyes said:
Thank you so much!
Can you or someone else please tell me how many antinodes make one wave length? And how many nodes make one wavelength?
3 antinodes=1 wavelength
3nodes=1wavelength!

its 3! sorry!

libra94

princesszahra said:
prudenteyes said:
Thank you so much!
Can you or someone else please tell me how many antinodes make one wave length? And how many nodes make one wavelength?
2 antinodes=1 wavelength
2 nodes=1wavelength!
isn't it 3?? :shock:

Zenzenzen

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

workinghard

its 10 ^10
i wrote in ms word format with powers
n here it changed sorry :sorry: