Which is true about scientific theories?

a: they are the result of a single experiment.
b: they are the results of many experiments over a long period of time.
c: they are proposed by scientists who wish to investigate a new topic.
d: they are only based on the most recent evidence.

How will each of the following changes in demand and/or supply affect equilibrium price and equilibrium quantity in a competitive market; that is, do price and quantity increase or decrease, or are the answers indeterminate because they depend on the magnitudes of the shifts?

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.