Which of the following is NOT a reason that digital signals are preferred over analog signals?

1)Digital signals use binary code which can be read by computers.

2)Digital signals can be easily saved and take up little storage space.

3)Digital signals use electromagnetic waves which allow for less interference in communications.

4)Digital signal waves are erratic and therefore penetrate thick concrete better.

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)

Which planets are visible without a telescope

Language is not the only way that humans communicate. describe how we use sound, touch, chemicals, and sight to communicate. need answer asap