Qualification > Sciences

physics

<< < (31/38) > >>

Phosu:
how do we find the resistances?

Phosu:

--- Quote from: T.Q on May 07, 2010, 04:42:53 pm ---D IN THE ANSWER



THEN  R x 16

--- End quote ---
rong ans is A

Phosu:
A mass of a liquid of density ? is thoroughly mixed with an equal mass of another liquid of density
2?. No change of the total volume occurs.
What is the density of the liquid mixture?
A)4/3? B)3/2? C)5/3? D)3?

halosh92:

--- Quote from: Phosu on May 07, 2010, 04:52:33 pm ---how do we find the resistances?

--- End quote ---

see
the voltage at R3 is 2V
at R2 its 1V
at R1 its 2V   (because all add up to 5V)
therefore R3 and R1 have same voltage therefore same resistance so its C

halosh92:

--- Quote from: Phosu on May 07, 2010, 04:35:50 pm ---The filament of a 240 V, 100W electric lamp heats up from room temperature to its operating temperature. As it heats up, its resistance increases by a factor of 16.

What is the resistance of this lamp at room temperature?
A)36? B)580? C)1.5k? D)9.2k?

--- End quote ---

P=IV
100/240= I (its in decimals so i wont write it)
R=V/I
R=240/I  =576
576/16= 36

Navigation

[0] Message Index

[#] Next page

[*] Previous page