A concave mirror can produce .

either a virtual image or a real image

a real image

a virtual image

a refracted image

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)

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this