Some ice cubes at 0°c with a total mass of 407 g are placed in a microwave oven and subjected to 750. w (750. j/s) of energy for 5.00 minutes. (assume all the energy of the microwave is absorbed by the water and no heat loss by the water.)

T = 52.3°C

Explanation:

given,

total mass = 407 g

power = 750 W

time = 5 minutes

Latent of melting = 334 J/g

increase in temperature = ?

energy required to melt =

     = m Lm

     = 334 x 407

     = 135938 J

energy by the microwave

E = 750 x 5 x 50

E = 225000 J

Actual energy increased

= 225000-135938 = 89062 J

using formula

Q = m  c_s Δ T

c_s  is the specific heat of water which is equal to 4.184 J/g⁰C

  T = 52.3°C

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete