Hookes law state that provided that the elastic limit is not exceeded, the extension is directly proportional to the force
Answer:
There is less gravitational force in space.
Explanation:
Gravity doesn't exist as it does on Earth. Earth's gravity is as 6 times stronger as it is on the moon.
The total amount of energy per hour is
Explanation:
In this problem we are told that the amount of energy reaching a square meter in the United States per hour is
The total surface area of the United States is
And converting into squared metres,
Therefore, the total energy reaching the entire United States per hour is given by:
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Answer:
d) v1 = v2 = v3
Explanation:
This can be answered using conservation of energy. We calculate the mechanical energy E=K+U (sum of kinetic and gravitational potential energies) at the original and final points, and impose they are equal.
At the original point we have, for the three balls:
At the final point we have, for the three balls:
Since we have , and is the same for all balls, then is the same for all balls, which means that , the final velocity, is the same for all balls.