What is the distance between the motion sensor and the object?
the motion sensor acts as a transmitter, when it sends out pulses, and as a receiver, when it listens for echoes. the delay t between sending a pulse and receiving the echo is equal to 8.8 ms (=0.0088 s). the air temperature id 20 degrees celsius.

1.5092 m

Explanation:

Time taken by the wave for the round trip is 8.8 ms

Velocity of sound at 20 degrees Celsius is 343 m/s

The distance to the object will be given by the one way trip

Time taken for one way trip is

Distance is given by

The distance between the motion sensor and the object is 1.5092 m

answer; ///(74) degrees is your answer..

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.