Suppose a spring compresses by 5cm if you put a 250 gram weight on top of it. How much potential energy is contained in the compressed spring?

a) 49 J

b) 2.45 J

c) 122 J

d) 0.061 J

e) I cannot tell from the information given.

What are similarities and differences of reflection, refraction, diffraction and absorption?

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.