If you wanted to know the location of a vehicle that ran out of gas after taking a zigzag route through the city, which quantity
1 answer:
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Answer:
Approximately 22.9 seconds.
Explanation:
A sound wave travel 340m in 1 sec
For 7800m it will travel;
= 22.94117647 sec
It will take approximately 22.9 seconds.
Answer: The force constant k is 10600 kg/s^2
Step by step:
Use the law of energy conservation. When the elevator hits the spring, it has a certain kinetic and a potential energy. When the elevator reaches the point of still stand the kinetic and potential energies have been transformed to work performed by the elevator in the form of friction (brake clamp) and loading the spring.
Let us define the vertical height axis as having two points: h=2m at the point of elevator hitting the spring, and h=0m at the point of stopping.
The total energy at the point h=2m is:
The total energy at the point h=0m is:
The two Energy values are to be equal (by law of energy conservation), which allows us to determine the only unknown, namely the force constant k: