Two objects of different composition with same mass are painted black and are placed in the...

Two objects of different composition with same mass are painted black and are placed in the sun at the same time. After 10 minutes object B is hotter than object A . Which has the higher specific heat . Explain 2.) Gold has a density of 19.3g / cm cube . If a chain necklace has a mass of 605g and volume of 42.7 cm cube , is the chain pure gold? Show calculations and explain basic concept of density.

Expert Solution

Specific heat of an object is the amount of heat required to raise the temperature unit mass of the object by 1 degree C.

=> Specific Heat = Total Heat / Mass x delta T

Total Heat absorbed by both the objects will be same since both ore of same mass and painted black.

Object B is hotter => delta T for object B is higher than object A

Since specific heat is inversely related to delta H (Total Heat and Mass being constant), object B has lower specific heat and Object A has higher specific heat

Density of chain neclace = Mass / Volume = 605 / 42.7 = 14.17 g / cm3

Since the density of the chain neclace is lower than the density of pure gold, the chain neclace is NOT pure gold.

Density is mass per unit volume.

Suppose you have an empty suitcase (It has low density)

Now you partially fill your suitcase with fruits. The suitcase still occupies the same space in room but it gets heavier (i.e it carries more mass) It gets DENSER (density increases)

queen_honey_blossom answered 1 day ago

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