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Homework Science? Density help?

ok i have questions i need to do but im not how to answer please help as much as you can it wil be very appreciated :) ok 1Why does a changing of the shape of an object have no effect on the density of that object? 2.Aluminum is used to make airplaneCast Iron is used to make weightlifting equipmentExplain Why the density of these metals make them useful for these purposes? 3what is the density of water?remember for water 1g1ml1cm3 4.Why does an air bubble rise to the surface of a glass water ? Ok answer as much and well as you can please and thankyou ;) theres more here ; Calculate the densitys of the following objectsObject A legnth 6cm width 3cm height 1cm mass36gVolume Density Object B legnth 10cm width 5cm height2cm mass 2cm mass 300gVolume DensityPlease and thankyou for your help i really need this :)i missed some school time due to illness so i need help thankyou.

Answer:

You need to check the antifreeze in the radiator for startersONLY check it when the car is completely cooled off or you could be severely burnedDo not let this engine run hot or a fairly simple fix can turn into something much more costly As stated already, it's probably the heater coreIt shouldn't have failed after such a short period of time but if you've got high mileage or haven't serviced the system, it's going to need to be replacedNot too cheap, but better than going for a possible blown head gasket from overheating, which is what eventually could happen if you don't get it fixed Hope this helps
heater hose or heater core bad means you got a leak means your car going to over heat soon mean you need to get it check today or saturday
I find it hard to believe that a heater core has already gone out in a car that is that newIt could be that the hose to the heater core is split right where it enters the compartment on the engine sideIt could also be the special fittings in this area have cracked.
When a heater doesn't work well, the first thing to check is the coolant levelWithout coolant, the heat can't get to your heater coreCheck it at the radiator cap when the engine is cool-don't hurt yourself by removing the radiator cap when the engine's hotLow coolant can cause your engine to overheat, which can blow your head gasketIf the level is ok, you probably need to replace your thermostatThe smell of antifreeze from the heater vents means your cooling system is leaking into the air ducts, likely from a leaking heater coreTurn your heater controls to cold so that you don't lose antifreeze so quickly, and check your coolant level before you driveOn many cars the heater core is very difficult to reach, this is a pretty big repair jobDon't go on any long road trips before you fix this, or you may end up stranded.
1Changing the shape of an object doesn't change its massIt also doesn't change its volume if the original material is not punctured or removedSince d m/V, if neither the mass nor the volume change, the density doesn't change2Al has a density of about 2.7 g/mL whereas Fe has a density of about 7.9 g/mLAl has a small mass compared to Fe for a given volumeLight weight materials are needed for airplanes whereas heavy materials are needed for weighlifting equipment3d m / V 1 g / 1 mL 1.0 g/mL Also, d m / V 1 g / 1 cm^3 1.0 g/cm^ 4The density of air is much less than the density of waterLess dense objects compared to water will rise in the water if they do not dissolveV l x w x h 6 cm x 3 cm x 1 cm 18 cm^3 d m / V 36 g / 18 cm^3 2.0 g/cm^3 V l x w x h 10 cm x 5 cm x 2 cm 100 cm^3 d m / V 300 g / 100 cm^3 3.0 g/cm^3

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