In determining the density of a rectangular metal bar, a student made the following measurements: length, 8.53 cm; width, 2.4 cm; height, 1.0 cm; mass, 52.7064 g. calculate the density of the metal to the correct number of significant figures.

Answer : The density of metal is, 2.5745 g/ml

Explanation : Given,

Length of rectangular metal bar = 8.53 cm

Width of rectangular metal bar = 2.4 cm

Height of rectangular metal bar = 1.0 cm

Mass of rectangular metal bar = 52.7064 g

First we have to determine the volume of rectangular metal bar.

Formula for volume of rectangle :

where,

V = volume of rectangular metal bar

l = length of rectangular metal bar

b = width of rectangular metal bar

h = height of rectangular metal bar

Now put all the given values in the above formula, we get:

Now we have to determine the density of metal.

Formula used :

Therefore, the density of metal is, 2.5745 g/ml

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.