You arrive at an intersection with traffic lights that are not working because of a power outage. what do you do

If you arrived at an intersection with traffic light that not working because of power outage, you must come to a complete stop at the traffic light, ensure you check all directions to be sure that no one is coming and safely proceed driving.  

In any way you arrived at an intersection where traffic light is not working due to an electric power failure, you should treat it as all way stop sign.

Traffic coming from any direction must stop first, and then move carefully through the intersection when you are sure that other turning and approaching vehicles, pedestrians and bicycle are no longer moving.  

Although most of the traffic signals when not working properly are designed to flash yellow in the priority direction and flash red in other directions, but a blackout traffic signal is the same as four-way traffic stop intersection

Traffic control signals are devices that are used to control flow of traffic. They can be placed beside or along roadway to guide road users which include motorcycles, bicycles, pedestrians and others.

A red signal light means you should STOP, red arrows also means stop until the green arrow turn up. The yellow signal light is warning you that red signal would soon appear. The Green signal light means you should GO.  

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answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg