Your heart pumps blood at a pressure of 100 mmhg and flow speed of 60 cm/s. at your brain, the blood enters capillaries with such a large total cross-sectional area that the blood velocity is much smaller: about 0.7 mm/s. ignore viscosity in the capillaries. how long could your neck be so that blood still reaches your brain in m

1.28 m

Explanation:

Generally, pressure of fluid is given by

where g is acceleration due to gravity, h is the height and is the density

Considering that the pressure for mercury is same as for blood only that the height and density of fluid are different then

Since g is constant, then

Making the subject of the formula then

Where subscripts m and b denote mercury and blood respectively

Assuming density of blood is 1060 Kg/m3, density of mercury as 13600 Kg/m3 and substituting height of mercury for 0.1 m then

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

e/c, where e is its total energy