Each day, the human heart pumps about 7500 liters of blood. As a simple approximation, assume that the work done by the heart is equal to the work required to lift this amount of blood from a person's feet to their head. Estimate the amount of work a person's heart does in a day if that person is 1.5 m tall. (Note that the density of blood is 1050 kg/m3  and 1 liter = 0.001 m3.) Given this approximation, what is the power output of this person's heart?

I've been working on this for a few days and i just don't understand, it's due in a few hours. you.the direction of a vector is defined as the angle of the vector in relation to a horizontal line. as a standard, this angle is measured counterclockwise from the positive x-axis. the direction or angle of v in the diagram is α.part a: how can you use trigonometric ratios to calculate the direction α of a general vector v = < x, y> similar to the diagram? part bsuppose that vector v lies in quadrant ii, quadrant iii, or quadrant iv. how can you use trigonometric ratios to calculate the direction (i.e., angle) of the vector in each of these quadrants with respect to the positive x-axis? the angle between the vector and the positive x-axis will be greater than 90 degrees in each case.part cnow try a numerical problem. what is the direction of the vector w = < -1, 6 > ?