For questions 4 and 5 use the information below specific heat capacity of ice =

Question

For questions 4 and 5 use the information below specific heat capacity of ice = 2,000 J/kg- degree C specific heat capacity of water = 4,000 J/kg- degree C latent heat of fusion of water = 334,000 J/kg A 1 kg block of ice is removed from a freezer where its temperature was -10 degree C. The amount of heat Q absorbed by the ice as it warms to 0 degree C is 2,000 J 20,000 J 4,000 J 334,000 J If 9.0 times 10^5 J of energy are transferred to 2.00 kg of ice at 0 degree C, what is the final temp of the system? 22.4 degree C 14.2 degree C 29 degree C 18.0 degree C 0 degree C A 4 m^3 block of wood of density 6 kg/m^3 floats in a fluid. The buoyant force on the block is 60 N 120 N 180 N 240 N

Explanation / Answer

4)

amount of heat needed = m * S * delta T

amount of heat needed = 1 * 2000 * 10

amount of heat needed = 20000 J option (b)

5)

let the final temperature is Tf

as this heat is more than what is needed to take ice to 0 degree C

9 *10^5 = 2 * (334 *10^3 + 4000 * Tf)

Tf = 29 degree

option (c)

6)

Buyoant force = weight of wood

Buyoant force = 6 * 4 * g

Buyoant force = 24 * 9.8

Buyoant force = 235.2 N = 240 N

option d)

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