Frodon possède un anneau en électrum, un alliage fait avec de l'or et d'argent : – l'or a une masse volumique de 19 300 kg / m3
– l'argent a une masse volumique de 10 500 kg / m3
Il fut forgé par Sauron, qui utilisa 2,8g d'or et 1,5g d'argent. Intrigué par la sensation de lourdeur de l'anneau,
Frodon mesura sa masse et son volume.
1. Quelle masse trouve-t-il pour l'anneau unique ?
2. Quelle est la masse volumique de l'anneau, le volume mesuré étant de 0,15mL ?
Conversion : 1 m3
= 1000 L
3. Pourquoi Frodon, lorsqu'il le porte, le trouve plus lourd qu'un anneau en or ou en argent ?

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.

0.02040816326

center (1,3) with radius 6

step-by-step explanation:

we must complete the square to find the center and radius of the circle.

first make sure the x and y squared terms have 1 as their coefficients. we also make sure x and y terms together.

we now create space between the x and y terms with parenthesis.

we complete the square by taking the middle terms -2x and the -6y - divide each and square them.

we add the squares to both sides.

simplify.

and write the quadratics in factored form.

the center is (h,k) or (1,3). the radius is the square root of 36 which is 6.

the first option i believe

step-by-step explanation: