23. 2-kg ice at -10°C is added to 5-kg water at 45°C. What is the final temperature of the system? The specific heat of ice and water are 2100 J/kg-K and 4190 J/kg-K, respectively. The latent heat of ice-water transition is 334000 J/kg. (A) 7.5 °C (B) 7.7 °C (C) 7.9 °C (D) 8.1 °C (E) 8.3 °C

4. Consider a collision between two objects. Which one of the following statements is wrong? (A) If the collision is elastic, the total kinetic energy is conserved after the collision. (B) If the collision is elastic, the total momentum is conserved after the collision. (C) If the collision is inelastic, the internal energy of these two objects may increase. (D) If the collision is inelastic, the total momentum is not conserved after the collision. (E) If the collision is inelastic, the total kinetic energy is not conserved after the collision.

23. 2-kg ice at -10°C is added to 5-kg water at 45°C. What is the final temperature of the system? The specific heat of ice and water are 2100 J/kg-K and 4190 J/kg-K, respectively. The latent heat of ice-water transition is 334000 J/kg.
(A) 7.5 °C
(B) 7.7 °C
(C) 7.9 °C
(D) 8.1 °C
(E) 8.3 °C

相關試題

相關試卷