It would be impossible to perform a controlled experiment on which of the following objects? a. two types of food
b. zebras in a zoo
c. the solar system
d. a piece of metal

6–55 refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 358c at a rate of 0.018 kg/s and leaves at 800 kpa as a saturated liquid. if the compressor consumes 1.2 kw of power, determine (a) the cop of the heat pump and (b) the rate of heat absorption from the outside air.

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?