An automobile starter motor is an electric motor used to start the gasoline engine. To operate the starter motor, the ignition switch is turned on, and a current of 55 A is supplied through a 1.9 mm radius copper wire that connects the motor to the automobile battery. (The density of free electrons of copper is 8.50 x 1028/m3.)(a) If electric charge had to travel the 0.52 m distance from the battery to the motor before the motor would operate, how long would it take?(b) How far do the electrons move in the 2.2 s required to start the engine?

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

the rearrangement of particles in a physical change. hope this

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.