Specific heat capacity, calorimetry, change of state, latent heat
- The quantities of heat required to raise the temperature of two solid copper spheres of radii r_1 and r_2 (r_1 = 1.5 r_2) through 1 K are in the ratio : Answer: 1. 27/8 Heat needed for a 1 K rise is Q=mcΔ T . Both spheres are copper, so c is the same and Q∝ m∝ r³ . Q₁/Q₂=(r₁/r₂)³=(1.5)³=27/8... 1
- Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is at 100 °C, while the other one is at 0 °C. If the two bodies are brought into contact, then, assuming no heat loss, the final common t… Answer: 1. more than 50 °C A body with larger heat capacity changes temperature less for the same heat exchanged. The 100 °C body has the la... 1
- A piece of ice falls from a height h so that it melts completely. Only one - quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is : [Latent heat of ice is 3.4×10^5 J/kg… Answer: 3. 136 km Key idea: loss in potential energy mgh becomes heat; one-quarter of it melts the ice. 1/4mgh=mL⇒ h=4L/g=dfrac4×3.4×10⁵10=1... 1