The focal length of a lens is dependent on the Question 24 options:

location of the object used

shape of the lens and the material it is made from

radius of curvature of the lens

material the lens is made from

Question 25 (1 point)
A concave mirror has a radius of curvature of 1.6 m. The focal length is

Question 25 options:

3.2 m.

none of the above.

32 cm.

0.80 m.

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)