Billy is sitting in a chair in class. if the action force is the downward push of his weight on the chair, what is the reaction force?
a. there is no reaction force
b. the upward force of the chair pushing on billy
c. the downward force of billy's weight on the earth
d. the upward force of the earth on billy

In what for do plants utilize nitrogen? why do they need nitrogen?

A60-tooth gear is connected to a 72-tooth gear.if the smaller gear turns 12 times,how many turns does the larger gear make?

Anurse is preparing to administer ampicillin 500 mg in 50 ml of dextrose 5% in water (d5w) to infuse over 15 min. the drop factor of the manual iv tubing is 10 gtt/ml. the nurse should set the manual iv infusion to deliver how many gtt/min? (round the answer to the nearest whole number. use a leading zero if it applies. do not use a trailing zero.)