A piece of ice falls from a height `h` so that it melts completely. Only one-quarter of the heat produced is absobed 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 xx 10^(5) J//kg` and `g = 10 N//kg`]A. 544 kmB. 136kmC. 68 kmD. 34km

A piece of ice falls from a height `h` so that it melts completely. On

1.	A piece of ice falls from a height `h` so that it melts completely. Only one-quarter of the heat produced is absobed 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 xx 10^(5) J//kg` and `g = 10 N//kg`]A. 544 kmB. 136kmC. 68 kmD. 34km
Answer» Correct Answer - B b) According to quesion as conservation of energy, energy grained by the ice during its fall from height h is given by E =mgh So, `(mgh)/4 = mL_(f)` As given, only one quarter of its energy is absorbed by the ice. So, `(mgh)/4 = mL_(f)` `rArr h=(mL_(f) xx 4)/(mg) = (L_(f) xx 4)/g = (3.4 xx 10^(5)xx4)/10 = 13.6 xx 10^(4)` =13600 m = 136 km

Discussion

No Comment Found

Related InterviewSolutions

At 1 atmospheric pressure, 1.000 g of water having a volume of `1.000 cm^3` becomes 1671 `cm^3` of steam when boiled. The heat of vaporization of water at 1 atmosphere is `539 cal//g` . What is the change in internal energy during the process ?
A slab consists of two layers of different materials of the same thickness and having thermal conductivities `K_(1)` and `K_(2)`. The equivalent thermal conductivity of the slab isA. K1 + K2B. K1 + K2/2C. 2K1 + K2 /K1 + k2D. K1 + K2/2KK2
The figure given below shows the cooling curve of pure wax material after heating. It cools from A to B and solidifies along BD . If L and C are respective values of latent heat and the specific heat of the liquid wax, the ratio L / C is A. 40B. 80C. 100D. 20
If a body cools down from `80^(@) C`to `60^(@) C` in 10 min when the temperature of the surrounding of the is `30^(@) C` . Then, the temperature of the body after next 10 min will beA. `50^(@) C`B. `48^(@) C`C. `30^(@) C`D. None of the above
A geyser heats water flowing at the rate of `3.0` litre per minute from `27^(@)C` to `77^(@)C`. If the geyser operates on a gas burner and its heat of combustion is `4.0 xx 10^(4) J//g`, then what is the rate of combusion of fuel (approx.)?
Same quantity of ice is filled in each of the two metal container P and Q having the same size, shape and will thickness but make of different materials. The containers are kept in identical surroundings, The ice in P melts completely in time `t_(1)`, whereas in Q takes a time `t_(2)`. The ratio of thermal conductivities of hte materials of P and Q is:A. `t_(2):t_(1)`B. `t_(1):t_(2)`C. `t_(1)^(2):t_(2)^(2)`D. `t_(2)^(2):t_(1)^(2)`
The calories of heat developed in 200 W heater in 7 min is estimatedA. 15000B. 100C. 1000D. 20000
The thickness of a metallic plate is 0.4 cm. The temperature between its two surfaces is `20^(@)C`. The quantity of heat flowing per second is 50 calories from `5cm^(2)` area. In CGS system, the coefficient of thermal conductivity will beA. 0.4B. 0.6C. 0.2D. 0.5
Equal masses of three liquids A, B and C have temperature `10^(@)C, 25^(@)C` and `40^(@)c` respectively. If A and B are mixed, the mixture has a temperature of `15^(@)C`. If B and C are mixed, the mixture has a temperature of `30^(@)C`, if A and C are mixed will have a temperature ofA. `16^(@)C`B. `20^(@)C`C. `25^(@)C`D. `29^(@)C`
Two identical conducting rods AB and CD are connected to a circular conducting ring at two diametrically opposite points B and C, the radius of the ring is equal to the length of rods AB and CD. The area of cross-section, thermal conductivity of the rod and ring are equal. points A and D are maintained at temperatures of `100^(@)C` and `0^(@)C`. temperature at poimt C will be A. `62^(@)C`B. `37^(@)C`C. `28^(@)C`D. `45^(@)C`

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment