A spaceship is flying through space at 250,000,000 m/s toward the earth when it launches a probe at a speed of 100,000,000 m/s toward earth relative to the ship. Would you expect the people on earth to measure the probe’s speed to be 250,000,000 + 100,000,000= 350,000,000 m/s? Why?

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.