Constructive interference occurs when which of the following occurs? A) Two interfering waves have a displacement in opposite directions.
B)The trough of a wave interferes with the crest of a second wave.
C)At the point where there are nodes of standing waves.
D)The crest of a wave interferes with the crest of a second wave.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.

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