Q&A - P3 Science

[atutor2001]

bebebub:

Can someone kindly help me with this question on Material:

Ships are made of heavy metals such as steel. Explain why they are able to float. TIA

A ship can float because the total volume of the ship is very big, which is made up of the steel and the air space in the ship. This increase in volume of the ship makes the mass per unit volume (called density) of a ship smaller than the mass per unit volume of water. For example, 1 cubic metre of water weighs 1 ton. If 1 cubic metre of a ship is say 0.5 ton, than the ship will float.

When the air space inside the ship is replaced by cargoes, the density of the ship will increase because cargoes is heavier than air. So a ship can only be loaded to a limit where the density i.e. 1 cubic metre must be less than 1 ton. Otherwise it will sink.

In short, a ship is able to float because a large part of its volume is filled with air, which is much lighter than water.

[atutor2001]

ttyh:

Pls help;

Draw a simple diagram to show life cycle of a garlic bulb.
I googled and cant find any good answer!! HELP....

adult plant -> garlic bulb -> garlic bulb with shoot (then back to adult plant)

[bebebub]

atutor2001:

bebebub:

Can someone kindly help me with this question on Material:

Ships are made of heavy metals such as steel. Explain why they are able to float. TIA

A ship can float because the total volume of the ship is very big, which is made up of the steel and the air space in the ship. This increase in volume of the ship makes the mass per unit volume (called density) of a ship smaller than the mass per unit volume of water. For example, 1 cubic metre of water weighs 1 ton. If 1 cubic metre of a ship is say 0.5 ton, than the ship will float.

When the air space inside the ship is replaced by cargoes, the density of the ship will increase because cargoes is heavier than air. So a ship can only be loaded to a limit where the density i.e. 1 cubic metre must be less than 1 ton. Otherwise it will ship.

In short, a ship is able to float because a large part of its volume is filled with air, which is much lighter than water.

Thanks! Hope my dd can understand this.

[smartmummy]

Hi!

Anyone tell me what are needed for mould growing?
Is that moist,air and warmth?

[Champion]

smartmummy:

Hi!

Anyone tell me what are needed for mould growing?
Is that moist,air and warmth?

My DD1's answer:
Mould is an example of Fungi.
Fungi grow in moist and shady places.
They do not need the Sun in order to grow.

Need experts to verify her answer too! Appreciates.

:thankyou:

[Just4Good]

Champion:

smartmummy:

Hi!

Anyone tell me what are needed for mould growing?
Is that moist,air and warmth?

My DD1's answer:
Mould is an example of Fungi.
Fungi grow in moist and shady places.
They do not need the Sun in order to grow.

Need experts to verify her answer too! Appreciates.

:thankyou:

They do not need sunlight. They can grow best in dark and damp areas. Quite a huge difference from plants, though.

[jedamum]

my son said that mould need air, moisture and food source to grow.

[smartmummy]

Thanks champ,just4Good and jedamum

Yup I know that they can’t make their own food as they don’t have chlorophyll.
So they are not plants but they are living things need air to grow.
In the process skills of diversity - My PALS are Here (school) book,they want to findout "Does mould need warmth to grow?"
The result was given " he should observe bread mould growing only on the bread that is exposed to sunlight.
I checked in the past paper qns that include some experiments,
one piece of wet bread put in 4 degree C and another one put in room temprature.The answer was the one in room temprature. They no need direct sunlight like plant but they need warmth.
Of cause they need food saurce to grow as they feed on dead or alive animals and plants.

[just888]

bebebub:

atutor2001:

[quote=\"bebebub\"]Can someone kindly help me with this question on Material:

Ships are made of heavy metals such as steel. Explain why they are able to float. TIA

A ship can float because the total volume of the ship is very big, which is made up of the steel and the air space in the ship. This increase in volume of the ship makes the mass per unit volume (called density) of a ship smaller than the mass per unit volume of water. For example, 1 cubic metre of water weighs 1 ton. If 1 cubic metre of a ship is say 0.5 ton, than the ship will float.

When the air space inside the ship is replaced by cargoes, the density of the ship will increase because cargoes is heavier than air. So a ship can only be loaded to a limit where the density i.e. 1 cubic metre must be less than 1 ton. Otherwise it will ship.

In short, a ship is able to float because a large part of its volume is filled with air, which is much lighter than water.

Thanks! Hope my dd can understand this.[/quote]Is this an exam questions? Kinda of chiem for a P3.

[just888]

smartmummy:

Thanks champ,just4Good and jedamum

Yup I know that they can't make their own food as they don't have chlorophyll.
So they are not plants but they are living things need air to grow.
In the process skills of diversity - My PALS are Here (school) book,they want to findout \"Does mould need warmth to grow?\"
The result was given \" he should observe bread mould growing only on the bread that is exposed to sunlight.
I checked in the past paper qns that include some experiments,
one piece of wet bread put in 4 degree C and another one put in room temprature.The answer was the one in room temprature. They no need direct sunlight like plant but they need warmth.
Of cause they need food saurce to grow as they feed on dead or alive animals and plants.

i think like the seeds need some warmth to grow, too cold unable to do so. Here is what I got from the wwb: Why does mold grow better in warm places? http://wiki.answers.com/Q/Why_does_mold_grow_better_in_a_warm_area