What is characteristic of an opaque object. allows some light to pass
allows no light to pass
allows only infrared light to pass
allows blurred light to pass

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)

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c