You normally drive on the freeway between San Diego and Los Angeles at an average speed of 105 km/h (65mi/h), and the trip takes
2 answers:
Answer:
3 hours and 28 minutes.
Explanation:
Average speed is gu=iven by,
Average speed =
∴ Total distance = Average speed × Total time
Average speed = 105
Total time = 2 hour and 20 minutes = 2.33 hour
Total distance = 105 × 2.33
Total distance = 244.65 km
The total distance between San Diego and Los Angeles is 244.65 km.
Due to heavy traffic the average speed is decreased to 70 .
Average speed =
∴ Total time =
Total time =
Total time = 3.495 hours
Total time = 3 hours and 28 minutes
Thus due to heavy traffic the time taken to travel from between San Diego and Los Angeles is 3 hours and 28 minutes.
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Answer:
d) 0 V
Explanation:
It can be showed that the potential due to a point charge q, to a distance d from the charge, can be expressed as follows:
where k =
As the potential is an scalar, and is linear with the charge, we can apply the superposition principle, which means that we can find the potential due to one of the charges, as if the other were not present.
By symmetry, all four charges are at the same distance from the center, so we can write the total potential, as follows:
where d, is the semi-diagonal of the square, that we can find applying Pythagorean theorem, as follows:
Replacing by the values in (1) we have:
which is equal to the option d).