19.55 the 8-kg uniform bar ab is hinged at c and is attached at a to a spring of constant k 5 500 n/m. if end a is given a small displace- ment and released, determine

(a) the frequency of small oscillations,

(b) the smallest value of the spring constant k for which oscillations will occur.

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

compass can be used day and night, cloudy or sunny

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.