physics help needed

[yinyang]

Can anyone please solve these two questions

june 2009
Q 14
Q 15
 

[T.Q]

edexcel or cie

and which paper ??

[yinyang]

it's cie  paper 1 sorry for not mentioning earlier 

[astarmathsandphysics]

Will try when i get home

[astarmathsandphysics]

14. P=Fv
F=kv^2 so P=kv^3 C
15 the water in the top half may be considered to go into vessel Y, falling average height h/2 in the process so loss of GPE=mgh/2 C
1

[yinyang]

that's what i thought for Q15 but according to the marking scheme the answer is B(mgh/4)

[cashem'up]

hey june 2007 q20......dont get it please explain....... by the way cie.....Thanks
 

[cashem'up]

of the same paper can someone also explain why in q27 the answer is A not B......why do the directions  have to be different is it because of the original wave and the reflected wave??? 

[astarmathsandphysics]

Think ms may be wrong on q15

[hetarth]

ok kk listen up when the weight  pulls the beam downwards the side at which x and y lie on have been stretched so tension applies there .....so answer is b

[cashem'up]

ok kk listen up when the weight  pulls the beam downwards the side at which x and y lie on have been stretched so tension applies there .....so answer is b

can u be more specific in terms of moments or etc....

[cashem'up]

hey june 2007 q20......dont get it please explain....... by the way cie.....Thanks
 

astarmathsandphysics...........sir can  u please help me out wid these questions.....Thanks

[halosh92]

june 2009 p1 cie
Q10
Q13
explain plz

[astarmathsandphysics]

10 from conservation of momentum speed of X is twice speed of Y since mass of X is half mass of Y
do (1/2 m (2v)^2)/(1/2 2m b^") =2
13 moments about spindle 0.2*900 =9.6F so F=300

[halosh92]

10 from conservation of momentum speed of X is twice speed of Y since mass of X is half mass of Y
do (1/2 m (2v)^2)/(1/2 2m b^") =2
13 moments about spindle 0.2*900 =9.6F so F=300

thankyou but Q13: answer is 150N