好正~^^

dolphin_ice

簡單易明易記! 對科學有興趣ge入來望下。 (英國會考程度)

http://bbc.co.uk/gcsebitesize/chemistry
http://bbc.co.uk/gcsebitesize/biology
http://bbc.co.uk/gcsebitesize/physics

幻藍

atmosphere也有分early不early的嗎...?

ps:不深 , 只是有些未學過的......../.\

dolphin_ice

Originally posted by 可愛的兔兒 at 2005-5-7 12:32 AM:
atmosphere也有分early不early的嗎...?

ps:不深 , 只是有些未學過的......../.\

10幾萬年前ge大氣層緊係同今日唔同啦

幻藍

Originally posted by 紅唇娃 at 2005-5-7 12:42 AM:

10幾萬年前ge大氣層緊係同今日唔同啦

一小時前的大氣層不可以是early atmosphere嗎...?
XDXDXDXD

dolphin_ice

Originally posted by 可愛的兔兒 at 2005-5-7 12:54 AM:

一小時前的大氣層不可以是early atmosphere嗎...?
XDXDXDXD

=o=|||
會考gawor

幻藍

Originally posted by 紅唇娃 at 2005-5-7 01:01 AM:

=o=|||
會考gawor

沒有provide "early"的definition bor~

細薯

問 ge 野好basic......==
but that's good~XD

1. You said mass.

Well done. The amount of matter in an object is its mass.


2. You said weight.

Well done. Weight is the force of gravity on an object.


3. You said kilogram.

Well done. Kilogram is the unit which we use to measure mass, the amount of stuff in an object.


4. You said newton.

Well done. Newton is the unit we use to measure a force.


5. You said 90.

Well done. The pull of gravity on the Earth is 10 N/kg, so a pull of 900 newtons acts on a mass of 90 kg.


6. You said kg.

Well done. Kilogram (Kg) is the correct unit.


7. You said 144.

Well done. The pull of gravity on the moon is 1.6 N/kg, so the astronaut's weight is 90 kg x 1.6 N/kg = 144 N.


8. You said N.

Well done. Newton (N) is the correct unit.


9. You said easier.

Well done. It would be easier for the astronaut to jump higher on the moon because the pull of gravity is less.


10. You said less.

Well done. The pull of gravity is less on the moon. This is because the mass of the moon is much less than that of the Earth.


You scored 10 out of 10 (100%).

1. You said 25.

Well done. The answer is in Newtons. Do not forget the units in the exam.


2. You said 2100.

Well done. The answer is in Newtons. Do not forget the units in the exam.


3. You said 1.5.

Well done. The answer is in m/s squared, the unit for acceleration. Do not forget the units in the exam.


4. You said 2.

Well done. The answer is in m/s squared, the unit for acceleration. Do not forget the units in the exam.


5. You said 2.

Well done. The answer is in m/s squared, the unit for acceleration. Do not forget the units in the exam.


You scored 5 out of 5 (100%).

[ Last edited by smallpotato226 on 2005-5-7 at 11:01 AM ]

dolphin_ice

提高學生自信心XD

細薯

Originally posted by 紅唇娃 at 2005-5-7 08:17 PM:
提高學生自信心XD

exactly!
我尋日phy. test 5 Qs 死3.5 Qs.....==

oscar

我見識到GCSE既Maths卷啦...
我覺得俾一個香港中三既學生，都一定pass到....
對我黎講，份卷過份容易....

其中一個test：
You scored 10 out of 10  

1. Write x2 + 8x + 2 in the form (x + b)2 + c
You said (x + 4)2 - 14 .

Well done - you remembered that 'b' was half the coefficient of x and completed the square correctly.

2. Write x2 + 3x + 1 in the form (x + b)2 + c
What is the value of b?
You said 3/2 .

Well done - you remembered that 'b' is half the coefficient of x!

3. The equation 2x2 + 8x - 3 is to be solved by completing the square.
Which of the following is a correct step in the solution:
You said (x + 2)2 = 11/2 .

Well done - you remembered to divide everything by 2.

4. Write 9x2 + 12x + 7 in the form (px + q) 2 + r
What is the value of r?
You said 3 .

Well done!

5.  
The equation x2 + 7x - 3 = 0 is to be solved using the quadratic formula above.
What are the values of a, b and c?
You said a = 1, b = 7, c = -3 .

Well done!

6. If the equation x = 4 - x2 is to be solved using the quadratic formula.
What are the values of a, b and c?
You said a = 1, b = 1, c = -4 .

Well done, you rearranged the equation correctly!

7. If the equation 2x2 + 3x - 1 = 0 is to be solved using the quadratic formula.
What is the value of b2 - 4ac?
You said 17 .

Well done, you substituted the values of a, b and c correctly!

8. The graphs of y = 3 - x2 and y = x + 1 are shown:


Use the graphs to find solutions to the simultaneous equations y = 3 - x2 and y = x + 1.
You said x = 1, y = 2 and x = -2, y = -1 .

Well done - you found the coordinates of the points where the two lines cross!

9. What are the solutions of the simultaneous equations x2 + y2 = 4 and x = y - 2?
You said x = -2, y = 0 and x = 0, y = 2 .

Well done, you solved the equations correctly!

10. Eliminate 'y' from the following simultaneous equations:

y = 1 - x
y = x2 - 1

What quadratic equation is formed?
You said x2 + x - 2 = 0 .

Well done, you rearranged the equation x2 - 1 = 1 - x.

[ Last edited by oscar on 2005-5-7 at 09:46 PM ]