PV Gap

Bernice Said:

Why Hydrogen when we have Electric?

We Answered:

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You are so correct. The battery electric vehicle is the closest-to-reality alternative fuel technology we have, and this is where the research dolars belong, not in fuel cells (which are essentially less-efficient electric vehicles).
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The clearest way to show this is with a couple of examples. GM's prototype fuel-cell car, the Equinox, has a 300-mile driving range - but the car weighs over 4,000 pounds!
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Contrast this to the Tesla electric sports car - it weighs maybe half that much - and has a range of 250 miles. If we added 2,000 pounds of additional batteries to the Tesla, it would have a driving range of nearly 1,000 miles!
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So which looks like the more viable technology?
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Despite lack of government funding, EV research has not stood still. Here's a new EV (out next year) that can charge its batteries in 10 minutes, and drive for up to 200 miles per charge:
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http://www.phoenixmotorcars.com
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Don't believe the disinfo about electric cars polluting. Electric motors are several times more efficient than gas engines. Power plants burn fuel at much higher efficiency than your gas car does. And distributing electricity by wire is far, far more efficient than trucking fuel around the countryside.
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All these efficiency improvements mean that the EV can travel further on less energy. That means much less pollution per mile, no matter what the power plants burn. Plus, a decent percentage of electricity is now made from non-polluting sources.
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It's absurdly easy to prove the efficiency argument by looking at fuel costs. It only costs about a tenth as much (in electricity costs, compared to gasoline) to go an equivalent distance in an EV versus a conventional vehicle.
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Kurt Said:

GCSE Science Questions?

We Answered:

1. I thought the answer was B, that only the S waves would travel to R since the P waves cannot travel through the outer core and R looked to be a little to the right of the wave tracing the path of the last P and S trajectory.

2. I'd imagine it's incorrect because at the equator the increased sunlight that would allow for good solar generation also creates the need for a lot of air conditioning which boosts electricity demands.

3. I have no idea how to answer that last question based on the information and answers provided. I'd be with you on your estimate of 1274 s.