An attractive force of |1N| exists between two charged particles. The magnitude of both charges is the same. If the particles are 0.25m apart what is the value and sign of the charge for both particles. A. (- 2.6x10-6 C) and (+ 2.6x10-6 C)

B. (+ 2.7x10-11 C) and (- 2.7x10-11 C)

C. (- 5.27x10-6 C) and (+ 5.27x10-6 C)

D. (- 6.94x10-12 C) and (- 6.94x10-12 C)

Asample of a gaseous substance changes into liquid. this process is called (blank) and it takes place when heat is (blank) a gaseous system

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

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)