1.

What is the weight in pounds of a gold bar 12.0 inches long, 6.00 inches wide and 3.00 inches thick? The density of gold is 19.3gcm^(-3). Given 1 inch = 2.54 cm, 1lb = 453.6 g.

Answer»


Solution :`"Weight in pounds "=12.0" in "xx"6.00 in"xx"3.00 in"xx(2.54cm)/("1 in")xx(2.54cm)/("1 in")xx(2.54cm)/("1 in")xx(19.3 G)/(1cm^(3))xx(1lb)/(453.6g)`
`=150.60491 lb=151lb` (after ROUNDING off because least PRECISE term has 3 SIGNIFICANT figures)


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