1-12 A 3-kg plastic tank that has a volume of 0.2 m is filled with liquid water. Assuming the density of water is 1000 kg/m, determine the weight of the combined system. 1-10 The acceleration of high-speed aircraft is sometimes expressed in g's (in multiples of the standard acceleration of gravity). Determine the upward force, in N, that a 90-kg man would experience in an aircraft whose acceleration is 6 g's.