Two children sitting on a see saw such that they can't swing. what is the net torque in this situation ??? Need an appropriate answer

25pts the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.