Why will a block of iron float in mercury but sink in water?

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?