The contrabassoon is the wind instrument capable of sounding the lowest pitch in an orchestra. it is folded over several times to fit its impressive 18 ft length into a reasonable size instrument. the actual fundamental frequency of the contrabassoon is 27.5 hz. this means the model of the instrument as an open-closed tube is a bit too simple. but if you insist on using that model, what is the "effective length" of the instrument?

b

explanation:

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.