Hydro and wind power are indirect forms of

A) solar energy.
B) fossil fuels deep down.
C) nuclear energy in Earth's interior.
D) none of the above


Answer: A

Physics & Space Science

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The graphs below show a voltage phasor at different instances of time. Which voltage phasor shows the instantaneous value of the voltage with the largest magnitude?

a.


b.


c.


d.

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Mars' mass is only a tenth of the Earth's, and its density is also less than the Earth's

Indicate whether the statement is true or false

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The measured value of the speed of light is about 300,000 km/s. Suppose a futuristic space train is traveling at 200,000 km/s with its headlights on. If you could measure the speed of the light from the headlights, you would find it to be

A) 200,000 km/s. B) 100,000 km/s. C) 300,000 km/s. D) 500,000 km/s.

Physics & Space Science

The process where some fraction of the quasar's enormous energy output is absorbed by the surrounding galactic gas is called ________

Fill in the blank(s) with correct word

Physics & Space Science