Problem: Incandescent light bulb:

Incandescent lamps are nearly pure resistive loads with a power factor of 1. This means the actual power consumed (in watts) and the apparent power (in volt-amperes) are equal. Incandescent light bulbs are usually marketed according to the electrical power consumed. This is measured in watts and depends mainly on the resistance of the filament, which in turn depends mainly on the filament's length, thickness, and material. For two bulbs of the same voltage, type, color, and clarity, the higher-powered bulb gives more light.

What principally determines the wattage of an incandescent bulb?
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A: the resistance of the filament

Problem: Military history of the United States:

With the emergence of ISIL and its capture of large areas of Iraq and Syria, a number of crises resulted that sparked international attention. ISIL had perpetrated sectarian killings and war crimes in both Iraq and Syria. Gains made in the Iraq war were rolled back as Iraqi army units abandoned their posts. Cities were taken over by the terrorist group which enforced its brand of Sharia law. The kidnapping and decapitation of numerous Western journalists and aid-workers also garnered interest and outrage among Western powers. The US intervened with airstrikes in Iraq over ISIL held territories and assets in August, and in September a coalition of US and Middle Eastern powers initiated a bombing campaign in Syria aimed at degrading and destroying ISIL and Al-Nusra-held territory.

What was the goal of UK and coalition airstrikes in Syria?
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A: unanswerable

Problem: Elizabeth II:

The engagement was not without controversy: Philip had no financial standing, was foreign-born (though a British subject who had served in the Royal Navy throughout the Second World War), and had sisters who had married German noblemen with Nazi links. Marion Crawford wrote, "Some of the King's advisors did not think him good enough for her. He was a prince without a home or kingdom. Some of the papers played long and loud tunes on the string of Philip's foreign origin." Elizabeth's mother was reported, in later biographies, to have opposed the union initially, even dubbing Philip "The Hun". In later life, however, she told biographer Tim Heald that Philip was "an English gentleman".

What was the King's name?
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A: unanswerable

Problem: Matter:

Since such mass (kinetic energies of particles, the energy of trapped electromagnetic radiation and stored potential energy of repulsive fields) is measured as part of the mass of ordinary matter in complex systems, the "matter" status of "massless particles" and fields of force becomes unclear in such systems. These problems contribute to the lack of a rigorous definition of matter in science, although mass is easier to define as the total stressenergy above (this is also what is weighed on a scale, and what is the source of gravity).[citation needed]

The mass of kinetic energy particles is not considered part of what?
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A:
unanswerable