Which of the following is a scientific question? A. What is the best price for an LED screen design?
B. Which LED screen design produces the most attractive images?
C. Which LED screen design is the most energy efficient?
D. Does the LED screen design violate a previous patent?

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2