Explain why it so much more expensive to transmit electricity locally than over long distances. Give as many reasons for this as you can
What will be an ideal response?
Many reasons exist. The voltage is lower, so current is greater and Joule heating
much more important than for long-distance transmission. Wires must be strung
everywhere a customer is instead of along a single right of way, and this involves substantial
expenditure. Substations with expensive transformers and capacitors must be used; these
costs are assigned to local transmission.
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If scientists excavate two fossils at the Grand Canyon, one of which was found at a much deeper rock layer than the other, what can we assume about the fossils?
A) The fossil found in a deeper layer is older. B) The fossil found in a deeper layer is younger. C) The fossil found in a deeper layer is not as well-preserved. D) The fossil found in a deeper layer has a higher carbon-12 abundance.
Roughly what percentage of the mass-energy of in-falling matter can be converted to other forms of energy as the matter falls into a black hole?
A) 0.7% B) 1-4% C) 10-40% D) 100%
A car of mass 1100 kg that is traveling at 27 m/s starts to slow down and comes to a complete stop in 578 m. What is the magnitude of the average braking force acting on the car?
A) 410 N B) 340 N C) 550 N D) 690 N
What is the probability of rolling either a 7 or 11 on a single roll of a pair of dice?
A. 1/6 B. 2/9 C. 3/8 D. 1/3 E. 1/2