Acertain part of an aircraft engine has a volume of 1.4 ft^3. (a) find the weight of the piece when it is made of lead. (b) if the same piece is made of aluminum, what is its weight? determine how much weight is saved by using aluminum instead of lead.

(a) 4400.83 N

(b) 1051.7 N

(c) 3349.13 N

Explanation:

V = 1.4 ft^3 = 0.0396 m^3

density of lead = 11.34 x 10^3 kg/m^3

density of aluminium = 2710 kg/m^3

(a) When lead is used

Weight = mass x gravity = volume x density x gravity

            = 0.0396 x 11.34 x 1000 x 9.8 = 4400.83 N

(b) when aluminium is used

Weight = mass x gravity = volume x density x gravity

           = 0.0396 x 2710 x 9.8 = 1051.7 N

(c) Difference in weight = 4400.83 - 1051.7 = 3349.13 N

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.