Phase changes occur with an attendant
A) convection.
B) temperature decrease.
C) temperature remaining constant.
D) temperature increase.
C
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Consider a situation where two moving objects collide and rebound from each other.Kinetic energy
a. is definitely conserved. b. is definitely not conserved. c. may or may not be conserved, depending on the nature of the collision. d. none of the above
A testable explanation for a natural phenomenon is a(n):
a. experiment b. hypothesis c. prediction d. model e. conclusive description
A pair of identical balls is connected by a massless rod, and thrown straight up into the air, such that the center of mass of the pair reaches a maximum height of 13.2 m above the point of release. 1.0 s after reaching this height, the velocity of one ball is measured to be 3.2 m/s upward. What is the velocity of the other ball at this time? Ignore air resistance.
A. 6.6 m/s down B. 9.8 m/s up C. 6.6 m/s up D. 13.0 m/s down E. 13.0 m/s up F. 9.8 m/s down
?Polarized light is to have its polarization plane rotated by 90°. In which of the following cases does the final beam have the greatest intensity?
A. ?3 polarizing filters, each rotate beam by 30°. B. ?2 polarizing filters, both rotate beam by 45°. C. ?1 polarizing filter, rotating beam by 90°. D. ?None of the above, polarized light can't be rotated.