Which if the following is true about scientific theory? a. a theory is a proposed explanation for a hypothesisb. a theory can be formed after a single experimentc. a theory can be changed to explain new observations or experimental resultsd. a theory can never be changed

Which position represents spring in the southern hemisphere? a) b) c) d)

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has:

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?