Different of light through two separate mediums causes the bending of waves fronts associated with light rays. a. reflections  b. densities  c. raysd. velocities 

An object's buoyant force and weight mean the same thing.a. trueb. false

In science and physics what is the standard unit of measure for speed?

An engine undergoes a cycle as shown in the diagram. during a complete cycle the work done by the gas is 28.5×103 j and the energy transferred thermally out is 99.4×103 j. there are 1.5×1024 gas molecules and they have three active degrees of freedom. 6. (6 pts) during which process(es) is energy transferred thermally into the gas? a. 1→2 b. 2→3 c. 4→1 d. 1→2 and 4→1 e. none of the above