An empty office chair is at rest on a floor.
consider the following forces:
1. a downward force due to gravity;
2. an upward force exerted by the floor; and
3. a net downward force exerted by the air.
which force(s) act on the office chair?
1. none of the forces act on the chair since
it is at rest.
2. all three forces
3. 1 only
4. 1 and 2 only
5. 2 and 3 only
its is not 1 i am guessing 4

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer