Does the siren of a moving police car seem to change pitch to the police officers inside the car? Why or why not?

In 1980, alfa romeo introduced the first system to smooth a rough idle caused by ignition and camshaft timing changes.

Acapacitor is storing energy of 3 joules with a voltage of 50 volts across its terminals. a second identical capacitor of the same value is storing energy of 1 joule. what is the voltage across the terminals of the second capacitor?

How does the entropy of steam compare to the entropy of ice?