Author Question: You drop a stone down a well that is 9.5 m deep. How long is it before you hear the splash? The ... (Read 42 times)

TFauchery · **on:** Jul 29, 2018

You drop a stone down a well that is 9.5 m deep. How long is it before you hear the splash? The speed of sound in air is 343 m/s and air resistance is negligible.

A) 1.2 s B) 1.4 s C) 1.3 s D) 1.6 s E) 1.5 s

Question 2

According to the theory of cosmic inflation, during a brief early inflationary period, the universe

A) expanded at lightspeed.
B) expanded at a speed that exceeded lightspeed.
C) expanded at a speed that was only slightly slower than lightspeed.
D) quickly became far more densely filled with matter.
E) quickly became far more densely filled with energy.