Two charges, q1 = 3 X 10^-6 C and q2 = 3 x 10°C, are connected by an insulating rod 10 m long. The rod is pivoted about its midpoint. The rod is kept horizontal 10 cm above the floor. Two identical charges, q = 5 x 10^-6 C, are fixed directly below q1 and q2, as shown Where should a 3-kg weight be placed on the rod. keep the rod horizontal? ​

answer; (d) spontaneous processes are characterized by the overall conversion of order to disorder;

c)as speed changes, wavelength and frequency change.

everything changes!

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.