A characteristic of the open-loop system is that it does not use feedback to determine if its output has achieved the desired goal
of the input. This means that the system does not observe the output of the processes that it is controlling. Closed-loop systems
employ feedback and a reference of correctness. Deviations from the norm are detected and corrections made in order to
maintain a desired output.
What type of system does the diagram represent?
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Explain the doppler effect in terms of frequency, wavelength, and speed.

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.