2011 PSLE Discussions and Strategy

[Guitar]

vlim:

Verysuperkiasu:

[quote=\"ngbrdad\"]

How did you manage to see the question ?

based on my son's memory....he drew out the pic for me.

light source--->small square cardboard---->metal ball--->bigger square cardbord but same height as the metal ball--->screen (all these are in side view profile). His answer is a square - (the square blocks the metal ball since they are of the same height).

then it should be circle right..as firstly the small square cardboard ball not going to have any effect..though the 3 rd object which is a square cardboard, has the same height as the ball, it is within shadow of the cirle metal ball..
< O X... :roll:[/quote]
my dd says in front of the light source there is something like a wall with a hole in it so when she drew the line starting from the hole, the metal ball's shadow will be cast on the screen.Her answer is the circle.

[Smurfiees]

ProteX:

WOOT I really hope to get A* for my Science . I have screwed by math and a lil' for eng . At least go into CGSS or CCHMS :xedfingers:

Good luck then![/quote]

:thankyou:

[moirwong]

papaya99:

stickyz:

The last question (booklet b)? About the spring one.


spring R-add loads to it then remove loads from it.
b) If the original length of spring R is 3cm, what will the length of the spring after all the loads are removed? Why? (rough idea of the question)

Help and thanks!

My ans is : 4cm. After the loads were added and removed, the spring extended by 1cm, which makes it 4cm.

my dd also says 4cm.

[stickyz]

What about booklet B first Qn?


About the circulatory system of a fish and human what is the difference? Anyone remember?
Thanks a lot!

[papaya99]

stickyz:

What about booklet B first Qn?


About the circulatory system of a fish and human what is the difference? Anyone remember?
Thanks a lot!

My ans is : the blood flows through the heart once in the fish while the blood flows through the heart twice in the human.

[vlim]

Guitar:

vlim:

[quote=\"Verysuperkiasu\"]based on my son's memory....he drew out the pic for me.


light source--->small square cardboard---->metal ball--->bigger square cardbord but same height as the metal ball--->screen (all these are in side view profile). His answer is a square - (the square blocks the metal ball since they are of the same height).

then it should be circle right..as firstly the small square cardboard ball not going to have any effect..though the 3 rd object which is a square cardboard, has the same height as the ball, it is within shadow of the cirle metal ball..
< O X... :roll:

my dd says in front of the light source there is something like a wall with a hole in it so when she drew the line starting from the hole, the metal ball's shadow will be cast on the screen.Her answer is the circle.[/quote]ok then it should be circle right..

[stickyz]

papaya99:

stickyz:

What about booklet B first Qn?


About the circulatory system of a fish and human what is the difference? Anyone remember?
Thanks a lot!

My ans is : the blood flows through the heart once in the fish while the blood flows through the heart twice in the human.

Thank you!
FIY, i wrote: the blood in the human flows to the heart then come out again before going to the body. However, the blood in the fish flows directly to the body. (mine sounds weird :s)

[littlestar]

stickyz:

What about booklet B first Qn?


About the circulatory system of a fish and human what is the difference? Anyone remember?
Thanks a lot!

i wrote: In the fish circulatary system, the blood flows only in one direction but the human system flows in 2 directions.

something like that :B

[ProteX]

papaya99:

stickyz:

What about booklet B first Qn?


About the circulatory system of a fish and human what is the difference? Anyone remember?
Thanks a lot!

My ans is : the blood flows through the heart once in the fish while the blood flows through the heart twice in the human.

Mine is Blood flows in single circulation in a fish while it flows in a double circulation in a human.

[stickyz]

littlestar:

stickyz:

What about booklet B first Qn?


About the circulatory system of a fish and human what is the difference? Anyone remember?
Thanks a lot!

i wrote: In the fish circulatary system, the blood flows only in one direction but the human system flows in 2 directions.

something like that :B

Thanks