Danielle is traveling and Siri tells her to go 35 miles North and make a U-turn. After Danielle makes the U-turn, Siri tells her to travel 17 miles South. It took Danielle 1 hour to do this. What speed is Danielle traveling (in MPH)? PLEASE HEL

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?

Since the energy was not raising the temperature of the water during these segments, what was the energy used to do instead? your answer must include an explanation of what is happening to the molecules.