Amotion sensor acts as a transmitter when it sends out pulses and as a receiver when it listens for echoes. the delay ∆t between sending the pulse and receiving the echo is equal to 8.9 ms. the air temperature is equal to 20º c. part a what is the distance between the motion sensor and the object?

1.526 m

Explanation:

The motion sensor sends sound waves in air which travels at a speed of 343 m per second at 20 degree. If d be the distance of the reflecting object

total distance travelled = 2d

Time taken t = 8.9 x 10⁻³ s

velocity v  = 2d / t

343 = 2 d / (8.9 x 10⁻³)

d = 1.526 m

seeing the graph would

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered