Aspeeding car is pulling away from a police car. the police car is moving at 30 m/s. the radar gun in the police car emits an electromagnetic wave with a frequency of 20.0 x 109 hz. the wave reflects from the speeding car and returns to the police car where the frequency is measured to be 4750 hz less than what was emitted. the speed of light is 3 x 108 m/s. how fast is the speeding car going?

65.625 m/s

Explanation:

c = Speed of light = 3×10⁸ m/s

Relative speed

Relative speed = 35.625 m/s

Velocity of speeder = Velocity of police car + Relative speed

⇒Velocity of speeder = 30 + 35.625 = 65.625 m/s

∴ Velocity of speeder is 65.625 m/s

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles