A scientist uses a camera to study the stars. How would the scientist most likely use this technology?

1 to replace all of the old data about stars
2 to predict the star count over a broad area
3 to write observations about what the sky looks like
4 to count the number of visible stars in the sky

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.