2A.1 Fluids, Density and Upthrust

Question 1

what is a fluid

Answer 1

it is any sunbstane that can flow (liquid, or gass sometimes solid like sandO

Question 2

what is denisty, and what does its vaule depend on

Answer 2

its mass per unit volume of a sunstance, the value of denisty depends on the mass of the particles that make up the substance and how closley pacjed they are

Question 3

what does density =

Answer 3

density (Kg m^-3) = mass (Kg) / Volume (m^3)

Question 4

what is the denisty of air

Answer 4

1.2

Question 5

what is the density of pure water

Answer 5

1000

Question 6

what is the density of sulfuric acid (95% concentration)

Answer 6

1839

Question 7

what is the density of cork

Answer 7

240

Question 8

what is the density of ice

Answer 8

919

Question 9

window glass

Answer 9

2579

Question 10

what is the denisty of iron

Answer 10

7850

Question 11

what is the density of gold

Answer 11

19 320

Question 12

what is Archimedes’ principle?

Answer 12

the upthrust of an object is equal to the wight displaced when an object is fully submerged in a fluid the weight of the fluid displaced is equal to the volume of the object x the density of the fluid x gravity

Question 13

how do you find the weight of the mass displaced

Answer 13

by using archimedes’ principle and the relationship between w=mg

Question 14

how do you find if an object sinks or floats

Answer 14

if teh upthrust of the object is lower than its weight it would sink

Question 15

for an object to float what must` happen

Answer 15

once the object is put in water it would have no upthrust since it hasnt displaced water yet as in sinks i would displacment increase so upthrust increases, once/if at any point the upthrust is equal to the wwight the object would float, in other words in order for teh object to flaoat it must sink untill in displaces its own weight of the fluid

Question 16

what is a hydrometer

Answer 16

an instrument used to determine the density of a fluid

Question 17

how does the hydrometer work

Answer 17

the hydrometer has a fixed weight, making it sink lower in objects with less density since a greater volume needs to be displaced to equal the weight of the hydrometer, the scale marking on the stem of the hydrometer tells us the density of a fluid

Question 18

what one use of the hydrometer

Answer 18

to check on the battery level (that include sulfuric acid) in cars the lower the density of the sulfuric acid the lower the charge on the battery level