A10 n board of uniform density is 5 meters long. it is supported on the left by a string bearing a 3 n upward force. in order to prevent the string from breaking, a person must place an upward force of 7 n at a position along the bottom surface of the board. at what distance from its left edge would they need to place this force in order for the board to be in static equilibrium?

Estimate the kinetic energy of mars with respect to the sun as the sum of two terms, that due to its daily rotation about its axis, and that due to its yearly revolution about the sun. (assume mars is a uniform sphere with mass = 6.4×10 to the power of 23 kg, radius = 3.4×10 to the power of 6 m, rotation period = 24.7 hours, orbital period = 686 days and is 2.3×10 to the power of 8 km from the sun.)