2. A step-up transformer used in an automobile has a potential difference across the primary of 12 V and a potential difference across the secondary of
2.0 x 104 V. If the number of turns in the primary is 21, what is the number
of turns in the secondary?​

hypothesising or postulating

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.

b. a lightning bug, plug of grass, and a worm

answer: 31, 5556. 952 seconds