Resistive forces are present in three distinct places in this experiment. (i) The bob exerts a frictional force on the ball as it is brought to rest relative to the bob during the collision. (ii) There is friction in the pendulum support. (iii) There is air resistance as the pendulum swings. Compare and contrast these three aspects of friction. What effect would each of these resistive forces have on the results

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.