I take 2.0 kg of ice and dump it into 1.0 kg of water and, when equilibrium is reached, I have 3.0 kg of ice at 0°C. The water was originally at 0°C. The specific heat of water = 1.00 kcal/kg•°C, the specific heat of ice = 0.50 kcal/kg•°C, and the latent heat of fusion of water is 80 kcal/kg. The original temperature of the ice was:
a. one or two degrees below 0°C.
c. -120°C.
b. -80°C.
d. The whole experiment is impossible.
B
You might also like to view...
The half-life of a radioactive element is the time it takes for:
A) half of the radioactive atoms to double themselves. B) half of the radioactive atoms to decay into isotopes. C) the radioactive atoms to increase by half of its initial quantity. D) the radioactive atoms to increase to 1.5 times of its initial quantity.
An ideal polarizer with its transmission axis rotated 30° to the vertical is placed in a beam of unpolarized light of intensity 10 W/m2. After passing through the polarizer, what is intensity of the beam?
A) 2.5 W/m2 B) 5.0 W/m2 C) 8.7 W/m2 D) 7.5 W/m2 E) 10 W/m2
An electron is released form rest in a region of space where a uniform electric field is present. Joanna claims that its kinetic and potential energies both increase as it moves from its initial position to its final position. Sonya claims that they both decrease. Which one, if either, is correct?
a. Joanna, because the electron moves opposite to the direction of the field. b. Sonya, because the electron moves opposite to the direction of the field. c. Joanna, because the electron moves in the direction of the field. d. Sonya, because the electron moves in the direction of the field. e. Neither, because the kinetic energy increases while the electron moves to a point at a higher potential.
What distinguishes the spectral type of a star?
A. the lines in its spectrum B. its brightness C. its distance D. its velocity