A car going initially with a velocity 13.5 m/s accelerates at a rate of 1.9 m/s for 6.2 s. It then accelerates at a rate of-1.2
2 answers:
Answer:
a) Maximum speed = 25.28 m/s
b) Total time = 27.26 s
c) Total distance traveled = 390,5537
Explanation:
In order to solve the first proble we just have to use the next formula:
So the maximum speed would be 25,28 m/s.
THe total time of the trip will be given by adding the inital time plus the velocity divided by the acceleration rate:
Remember that when dealing with time in physics you will always use positive numbers since there is no negative time.
To calculate the total distance covered we use the next formula:
This is the first part now we calculate it with the stopping of the car:
No we just add the two distances to discover the whole distance:
Total distance= 124,268+266,2857= 390,5537
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Answer:
It's 1.0000042 times longer in summer than in winter. It represents a 1.6 centimeters difference between seasons.
Explanation:
The linear coefficient of thermal expansion for steel is about . From the equation of linear thermal expansion, we have:
Taking the winter day as the initial, and the summer day as the final, we can take the relationship between them:
It means that the bridge is 1.0000042 times longer in summer than in winter. If we multiply it by the length of the bridge, we obtain that the difference is of about 1.6 centimeters between the two seasons.