Related InterviewSolutions

• A lead bullet penetrates into a solid object and melts. Assuming that 50% of its kinetic energy was used to heat it, calculate the initial speed of the bullet. The initial temperature of the bullet is `27^@C` and its melting point is `327^@C`. Latent heat of fusion of lead `= 2.5 xx 10^4 J//kg` and specific heat capacity of lead `=125 J//kg.K`.
• A lead bullet strikes against a steel plate with a velocity `200ms^-1`. If the impact is perfectly inelastic and the heat produced is equally shared between the bullet and the target, thent he rise in temperature of the bullet is (specific heat capacity of lead `=125Jkg^-1K^-1`)A. `80^@C`B. `60^@C`C. `160^@C`D. `40^@C`
• 10 g of ice at `0^@C` is mixed with 100 g of water at `50^@C`. What is the resultant temperature of mixtureA. `31.2^@C`B. `32.8^@C`C. `36.8^@C`D. `38.2^@C`
• 19 g of water at `30^@C` and 5 g of ice at `-20^@C` are mixed together in a calorimeter. What is the final temperature of the mixture? Given specific heat of ice `=0.5calg^(-1) (.^(@)C)^(-1)` and latent heat of fusion of ice `=80calg^(-1)`A. `0^@C`B. `-5^@C`C. `5^@C`D. `10^@C`
• `1kg` ice at `0^(@)C` is mixed with `1kg` of steam at `100^(@)C`. What will be the composition of the system when thermal equilibrium is reached ? Latent heat of fusion of ice `= 3.36xx 10^(6)J kg^(-1)` and latent heat of vaporization of water `= 2.26 xx 10^(6)J kg^(-1)`
• Four `2 cmxx2 cmxx 2cm` cubes of ice are taken from a refrigerator and put in `200ml` of a drink at `10^(@)C`(a) Find the temperature of the drink when thermal equilibrium is attained in it. (b) If the ice cubes do not melt completely, find the amount melted. Assume that no heat is lost to the outside of the drink and that the container has negligible heat capacity. Density of ice `= 900 kg m^(-8)` , density of the drink `= 1000kgm^(-8)`, specific heat capacity of the drink ` = 4200 J kg^(-1)K^(-1)` ,latent heat of fusion of ice `= 3.4 xx 10^(6)Jkg^(-1)`
• A metallic ball and highly stretched spring are made of the same material and have the same mass. They are heated so that they melt. The latent heat requiredA. are the same for bothB. is greater for the ballC. is greater for the springD. for the two may or may not be the same depending upon the metal
• A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass m/2 and specific heat 2 c is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture isA. `(2//3) T`B. `(8//5) T`C. `(3//5) T`D. `(3//2) T`
• Two liquids A and B are at `30^@C` and `20^@C`, respectively When they are mixied in equal masses, the temperature of the mixture is found to be `26^@C`. The ratio of their specific heat isA. `4:3`B. `3:4`C. `2:3`D. `3:2`
• A vessel contains `110 g` of water. The heat capacity of the vessel is equal to `10 g` of water. The initial temperature of water in vessel is `10^(@)C`. If `220 g` of ho, water at `70^(@)C` is poured in the vessel, the final temperature neglecting radiation loss, will beA. `70^@C`B. `80^@C`C. `60^@C`D. `50^@C`