The gravitational force exerted by an object is given by f 5 mg where f is the force in newtons, m is the mass in kilograms, and g is the acceleration due to gravity, 9.81 m/s². calculate the force exerted per unit of area by a column of mercury (density 5 13.59 g/cm³) that is 76.0 cm high. how high would a column of water (density 5 1.00 g/cm³) have to be to exert the same force?

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth