The Sears Building in Chicago sways back and forth with a frequency of about 0.1563 Hz.
What is its period of vibration?
Answer in units of s.

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

Which notation is used to represent an alpha particle? a. b. c. d.

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.