physics

[neno]

in june 2004 wat formula did u use to find the velocity..i understand the part tht ur resolving ur finding the vertical component of velocity ryt

r u using the formula 2as=v2-u2 do u take u2 at 0
                             2as=v sin theta
but y do u take 2 theata??

[nid404]

you don't need the derivation

s= v² sin 2 / g

[neno]

in octnov 2004 Q25 y cant it b the frequency cuz then v already noe the speed of sound n v cud jst simply devide..
lol i got Q33 when i read it 2wice
 Thanks alot By the way

[neno]

s= v2 sin 2 / g


v nvr used this formula so wat are the conditions tht u use it under
when thrs in angle or it requires more

is it used in projectiles also when u wana find the velocity ??

[halosh92]

in octnov 2004 Q25 y cant it b the frequency cuz then v already noe the speed of sound n v cud jst simply devide..
lol i got Q33 when i read it 2wice
 Thanks alot By the way

i believe thats because its a stationary wave

[neno]

so the speed of a stationary wave is not the same as a progressive wave...but everything else is the same ryt the wavelength and the frequency....

[Phosu]

28 Microwaves of wavelength 3.00 cm are incident normally on a row of parallel metal rods. The separation of the rods is 8.00 cm. The first order diffraction maximum is observed at an angle of 22.0° to the direction of the incident waves.

What is the angle between the first and second order diffraction maxima?
A 22.0° B 26.6° C 44.0° D 48.6°

[astarmathsandphysics]

Strange question
28 microwaves?
Where is the question from

[Phosu]

nov 03 pp1,
i also have a few more doubts
4, 6, 14, 16,

[vanibharutham]

d sin(theta) = n Lamba

for the first order maxima, i.e. the central maxima

8 sin (theta) = 3 x 1

Theta = 22.04

confirmed

For the second order maxima,

8 sin (theta) = 2 x 3

theta = 48.6

therefore, the angle between them is

48.6 - 22 = 26.6

Therefore B

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