When an ambulance is coming towards you with siren on, then passes by and the sound of the siren changes…

Electric heating produces great amounts of draft.

The force of attraction between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between the two objects. 

If a high-limit switch fails, ____.

In space, no one can hear you scream.    Which one is the best physics answer. 

Unit for Frequency.    Hint: __________ Rent-A-Car

Faster than the speed of sound. 

How much electrical power is needed to heat a room that requires 7500 Btu/hr? 

A room that requires 13,000 Btu/hr for heating requires 3.809 W to heat.

To confirm airflow through an electric furnace, a ____ may be used.