On branche un conducteur ohmique de résistance R = 10 homs aux bornes d'une pile G de fem. E = 9,0 V et de résistance intérieure r = 2,0 N.
Un courant d'intensité I circule alors
dans le circuit.
a) Faire un schéma et préciser le sens du courant.
b) Calculer I.
c) On branche en dérivation aux bornes de R, un conducteur ohmique de résistance R2 = 30 N.
C.1) Calculer la nouvelle valeur l’ de l'intensité du courant dans le circuit.
0.2) Calculer les valeurs , I1 et I2 des intensités des courants traversant respectivement R1 et R₂

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

If forces acting on an object are unbalanced. true or false

It is really hard for me right know