Two airplanes leave an airport at the same time. The velocity of the first airplane is
700 m/h at a heading of 54◦
. The velocity of
the second is 560 m/h at a heading of 179◦
.
How far apart are they after 1.4 h?
Answer in units of m

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?

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.