A 5\text{ g} piece of ice at -20^\circ\text{C} is put into m\text{ kg} of water at 30^\circ\text{C} temperature. The heat is exchanged only between the ice and the water. The final temperature of the mixture is 0^\circ\text{C} in liquid phase. What is the value of m in kg?
- A. 0.050
- B. 0.010
- C. 0.015 ✓
- D. 0.150
Correct Answer: C. 0.015
Explanation
Heat gained by ice to reach 0^\circ\text{C} and melt = (5 \times 0.5 \times 20) + (5 \times 80) = 450\text{ cal}. Heat lost by water = m \times 1000 \times 1 \times 30 = 30000m\text{ cal}. Equating them gives m = 0.015\text{ kg}.
Related questions on Physics
- The commercial unit of electrical energy is kilowatt-hour (kWh), which is equal to
- Which one of the following statements regarding a current-carrying solenoid is <strong>NOT</strong> correct?
- An object is made of two equal parts by volume; one part has density \rho_{0} and the other part has density 2\rho_{0}. What is the aver...
- A pressure cooker cooks food faster by
- Which one of the following wavelengths corresponds to the wavelength of X-rays?