Two people of different masses sit on a seesaw. m1, the mass of person 1, is 93 kg, m2 is 44 kg, d1 = 0.8 m, and d2 = 1.2 m. the mass of the board is negligible. (a) what is the magnitude of the torque about the pivot (location a. due to the gravitational force on person 1? |τa,1| = n · m

Estimate the kinetic energy of the neptune with respect to the sun as the sum of the terms, that due to its daily rotation about its axis, and that due to its yearly revolution about the sun. [assume the neptune is a uniform sphere with mass = 1.0×1026 kg , radius = 2.5×1010 m , rotation period 16.1 h , orbital period 6.01×104 d and is 4.6×109 km from the sun.]