Ahighway patrol officer uses a device that measures the speed of vehicles by bouncing radar waves off them and measuring the doppler shift. in one such instance, the outgoing waves had a frequency of 100 ghz and the returning echo had a frequency 15 khz higher. assume the officer is facing in the positive direction. what is the velocity of the vehicle? note that there are two doppler shifts in echoes. be certain not to round off until the end of the problem, because the effect is small.

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

massxgravity x heght=weightxheight= pe

4900=490xh

h=10

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.