the lab has a container of liquid nitrogen that is hung from a force probeA temperature probe will be placed in the beaker of water The aluminum cylinder will be placed in the beaker of water so it can come to equilibrium with waterThen the aluminum from the container of water will be taken out and added to the liquid nitrogen and measure how much liquid nitrogen boils offThe final temp of aluminum when it comes to equilibrium with the liquid nitrogen was measuredAfter aluminum has reached equilibrium with the liquid nitrogen, remove the aluminum from the nitrogen, place it back in the water and measure the temp change of waterThey will cool down to a final temperature1Why did the temperature plot of water start dropping in the second experiment? Describe the major heat flow and its directionWhy did the temperature plot start rising after reaching a low point? Describe the major heat flow and its direction.
If 6.2kW applied to the motor, and the motor is 88% efficient, then the output power of the motor MkWhint apply the efficiency to the input power in a manner that makes senseThen, if the output efficiency of the crane is 42%, then output power of the crane is CkWhint the output of the crane is between 2 and 3kWThen, with that available power, what is the fastest that a 420kg weight can be raised?
Step 1 in your journey into the weird and wonderful world of physics: Learn to spell it!
required speed [6.210000.880.42]/(4209.8) 0.557 m/s
before you put back the aluminum water temp was same as the environment tempsince the aluminum is colder than the water (water 0-100 deg) liquid nitrogen (-210 - -195 deg) the water is getting colder since heat is leaving the water to heat the aluminumwhen the water is getting cooler the environment air start to heat the water, since heat transfer is function of temp difference and since the aluminum is much cooler than the air at start the heat loose to the aluminum is higher later when aluminum heats and has temperature close to the water than heat transfer is mainly to the environment air.
