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.

Stars x and y are both bluish main sequence stars. star x has a higher absolute brightness than star y. how do the two stars compare? explain

You are about to open a container of soy milk but notice that there are instructions to “shake well before serving.” the soy milk is most likely a

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?