11) What is the specific gravity of the metal, if the piece of metal weighs 150 grams in air and 125 grams in water?

12) What is the volume of mercury in cm3, if the mass (m) of mercury is 136 grams (g) and density (r) of mercury is 13.6 g/cm3?

13) What is the block weighs (W) in kg, if volume (V) is 320 cm3 and density 8.9 g/cm³?

14) What is the specific gravity of the metal, if the weighs 6.5 kgf in air and 3.5 kgf in water?

15) What is the weight force of a car has a mass of 800 kg?(Take g = 9.81m/sec)