tina knows that sonar measures distance by timing how long the echo of a sound takes to return. she says it is possible because sound has a particular frequency. is she correct

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

One number is said to be an "order of magnitude" larger than another number if choose one: a. it is 10 times larger. b. it is 5 times larger. c. it is 3 times larger. d. it is 100 times larger. e. it is 2 times larger.