PLEASE HELP ME WITH THOSE 3 QUESTIONS 1) A motor outputs 1000 J of energy in a given amount of time. 100 J is used to turn a rotor. How much heat energy is gained by the air around the engine?

2) A virtual image is 3 meters behind a flat mirror and it is 2 meters tall. What is the height and distance from the mirror, for the object?

3) A concave mirror has a focal length of 1 meter. An object is 2 meters from the mirror. What is the image distance from the mirror?

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.