Heat required by 0.5 kg of water to rise by 10 degrees C is (c = 4200 J/kg/C)
A21000 J
B4200 J only
C8400 J only
D42000 J only
Answer & Solution
Correct answer: A. 21000 J
1. Use Q = m * c * delta T.
2. Q = 0.5 * 4200 * 10.
3. = 21000 J.
4. So the required heat is 21000 J.
_Source: Selina Concise Physics Class 8, Ch 5 Heat (Mistral OCR'd PDF), section on Q = mc delta T_
Related questions
A calorimeter of mass 100 g (specific heat 0.1 cal/g °C) contains 250 g of liquid at 30 °CTo convert 2 kg of water at 20 °C into ice at 0 °C, liquid ammonia is evaporated. Given spA thermally insulated pot holds 150 g of ice at 0 °C. How much steam at 100 °C must be add80 g of steam at 97 °C is released onto an ice slab at 0 °C. Using L(vap) = 540 cal/g, speA copper sphere of mass 100 g at 100 °C is dropped into 195 g of water at 20 °C held in a Going by the calorie definition, the heat needed to raise the temperature of 1 kg of waterIn Hope's apparatus, when water is cooled by the freezing mixture, the lower thermometer THow much heat must be supplied to convert 10 g of ice at 0 °C into water at 50 °C? (Latent