1) A kettle boils 2 kg of water at 100 °C into steam. Latent heat of vaporization of water is 2.26 × 10⁶ J/kg. Heat required is: a) 2.26 × 10⁶ J b) 4.52 × 10⁶ J c) 1.13 × 10⁶ J d) 6.00 × 10⁶ J 2) A 0.5 kg ice cube at 0°C melts in a room. If it absorbs 2.00 × 10⁵ J, how much ice remains un-melted? Lf = 3.34 × 10⁵ J/kg a) 0.20 kg b) 0.15 kg c) 0.10 kg d) 0.20 kg 3) A 0.25 kg sample of steam condenses at 100 °C. Lv = 2.26 MJ/kg. Heat released is.. a) 2.26 × 10⁶ J b) 6.00 × 10⁵ J c) 1.13 × 10⁵ J d) 5.65 × 10⁵ J 4) If 3 kg of ice melts at 0 °C, heat absorbed is.. (Lf = 334 kJ/kg) a) 1.002 × 10⁶ J  b) 3.34 × 10⁵ J c) 2.26 × 10⁶ J d) D. 1.50 × 10⁶ J 5) A 0.6 kg ice block at 0°C is melted and then heated to 50°C. How much total heat is needed? Lf = 3.34 × 10⁵ J/kg, specific heat of water c = 4.2 × 10³ J/kg·K a) 2.68 × 10⁵ J b) 1.67 × 10⁵ J c) 4.84 × 10⁵ J d) 3.34 × 10⁵ J 6) A 0.3 kg ice block at 0°C is melted using 1.00 × 10⁵ J. What fraction of the block melts? a) 0.25  b) 0.10 c) C. 0.3 d) 0.5 7) A block of ice of mass 0.5kg is melted completely at 0∘C. The specific latent heat of fusion of ice is 3.34×105J/kg. a) 1.00 × 105J b) 6.68 × 105J  c) 3.34 × 105J d) 1.67 × 105J e)   8) A metal cup contains 0.2kg of ice. If 6.68 × 104J of heat is added, how much ice melts? Lf​ = 3.34 ×105J/kg a) 0.10 kg b) 0.05 kg c) 0.20 kg d) 0.15 kg 9) A student uses a heater to melt 0.5 kg of ice. The heater’s power is 200 W. How long will it take? Lf = 3.34 × 10⁵ J/kg a) 835 s b) 835 s c) 1000 s d) 500 s 10) To boil away 1.0 kg of water, a kettle supplies 2.26 × 10⁶ J. If its power is 1 kW, how long does it take? a) 1260 s b) 2260 s  c) 1130 s d) 1000 s

Demonstrate the solving of numerical problems on heat measurement

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