
Concept explainers
(a)
The sketch of speed – time graph.
(a)

Answer to Problem 54P
The sketch of speed – time graph of air plane is drawn.
Explanation of Solution
The below figure shows the speed time graph of the airplane.
Airplane was initially at rest on the ground, accelerates quickly and gains its top speed in first 10 minutes and then it travels with constant speed and then while it lands off it decelerates quickly to the ground similar to the acceleration while taking off.
Conclusion:
The sketch of speed – time graph of air plane is drawn.
(b)
The average speed of the trip.
(b)

Answer to Problem 54P
The average speed of the trip is
Explanation of Solution
Write the expression to calculate the average speed.
Here,
Conclusion:
Substitute
Therefore, the average speed of the trip is
(c)
The top speed in the trip
(c)

Answer to Problem 54P
The top speed in the trip is
Explanation of Solution
For the first 10 min and last 10 min that is for a total of 20 min the average speed of the airplane was half the top speed. For the remaining time
Here,
Write the expression to calculate the total distance travelled by the airplane.
Here
Use
Conclusion:
Substitute
Therefore, the a top speed of the trip is
(d)
The average acceleration during first 10 min.
(d)

Answer to Problem 54P
The average acceleration during first 10 min is
Explanation of Solution
Write the expression for average acceleration during first 10 min.
Here,
Conclusion:
Substitute
Therefore, the average acceleration during first 10 min is
(e)
The average acceleration during the central hours of the trip.
(e)

Answer to Problem 54P
The average acceleration during the central hours of the trip is
Explanation of Solution
During the central hours of the trip, the airplane travelled with top speed. Top speed is constant and hence during the central hours of the trip the acceleration was zero.
Conclusion:
Therefore, the average acceleration during the central hours of the trip is
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Chapter 2 Solutions
College Physics, Volume 1
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