The speakers in a sports stadium are 89.5 m from a fan's seat. How much
time does it take sound to travel from
the speakers to the fan's seat?
Speed of sound = 343 m/s
(Unit = s)

This is also one I am confused on

a and c

c is 100% but i am confused in a

wavelegth as in spectrum red oygbiv

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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.