Hi! All,


Then, may I know if the thing, let’s say a small metal block, put on the top of a cupboard has gravitational potential energy?

thanks.

Hi! Dharma and Autor2001


Thanks for both of your explanation.

Hi!


thanks for your prompt reply. The answer given is 176 and the word maximum is underlined and bloded to remind students that the answer should be miximum. Any idea?

thanks :lol:

Hi! All,


Can solve the following question?

June Jie bought some candies that came in square pyramid packages. Each pyramid had a square base area of 1 cm square and a vertical height of 1 cm. He then packed the candies in a box measuring 6 cm by 4 cm by 4 cm. What was the maximum number of such candies he could pack into the box?

thanks.

Hi! Nebbermind,


I think option 2 is correct! I think the elastic band can be stretched, if not it will not be called an elastic band!
For option 4, ...I don't know!! :?: :?: :?: :? :? :?

meimeitan

Hi! Nebbermind


Thanks a lot! However, the answer on the exercise book is a, b, c. Could it be that the powder makes the surface the car is moving on more slippery? I think the answer in the exercise book is wrong! I really don't know! Need to check with others!! Once again, thanks!!

meimeitan

Another challenging question:


A group of boys were competing to see whose car can travel the greatest .
The car is flung forward using a elastic band like a captapult on the ground.

If you were one of them, what can you do to increase the chances of winning?

1. extend the elastic band as far as possible
2. use a thicker rubber band
3. use a lighter toy car
4. put some powder on the surface the car is travelling on

thanks!! :? :? :?: :?: :?: :?:


meimeitan

Hi! starlight1968sg


Thanks a lot! Thanks a lot! Thanks a lot! Thanks a lot!

Have a nice day!!

meimeitan

Hi!


Some challenging questions: he he he …

(1) A jar with grasshoppers in it in field from 8 am to 5 pm. Which of these factors of the environment would affect their survival?
a availability of food
b presence of predators
c inappropriate temperature

which is / are correct? Thanks.

(2) Which of the following occurs at evening (about 6 pm) in a plant?
a respiration begins to take place.
b photosynthesis stops completely.
c the rate of photosynthesis is lower than the rate of respiration.
d the rate of photosynthesis is the same as the rate of respiration.

thanks thanks thanks.

meimeitan

Hi! All,


Super sorry! Sayang Sayang. NYPS got two top scorer. Their score are 276. 272 from mainstream.

meimeitan