If the world pulls down on an apple, what is the reaction force? Explain.
2 answers:
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The final velocity of the tool is 107.4 m/s
Explanation:
We can solve this problem by using the principle of conservation of energy.
In fact, if air resistance is negligible, the total mechanical energy of the tool is conserved during the fall, so we can write:
where
is the kinetic energy of the tool at the top (zero since it is at rest)
is the gravitational potential energy of the tool at the top, where
m is the mass of the tool
g is the acceleration of gravity
h is the heigth of the tool
is the kinetic energy of the tool just before hitting the ground, where
v is the final speed of the tool
is the gravitational potential energy of the tool at the bottom (zero since the height is zero)
Re-arranging the equation,
where we have
And solving for v,
Learn more about kinetic energy and potential energy:
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Answer:
Explanation:
For this exercise you can use the Pythagorean theorem to find the magnitude of the resultant displacement.
Then:
You can observe that the square of the displacement is equal to the sum of the square of the horizontal displacement and the square of the vertical displacement.
Since the pirate walks 37.0 meters north and then turns and walks 8.5 meters east:
Substituting values and solving for "d", you get:
