What is the kinetic energy of a 26 kg eagle flying at an altitude of 65 m at a speed of 19 m/s?
1 answer:
Answer:
4693 J
Explanation:
The kinetic energy of the eagle is given by:
where
m is the mass of the eagle
v is the speed of the eagle
In this problem, m = 26 kg and v = 19 m/s. Substituting into the formula, we find
As we can see, the altitude of the eagle is not relevant for the calculation of the kinetic energy.
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By looking at the acceleration of the object.
In fact, Netwon's second law states that the resultant of the forces acting on an object is equal to the product between the mass m of the object and its acceleration:
So, when static friction is acting on the object, if the object is still not moving we know that all the forces are balanced: in fact, since the object is stationary, its acceleration is zero, and so the resultant of the forces (left term in the formula) must be zero as well (i.e. the forces are balanced).
In fact, Netwon's second law states that the resultant of the forces acting on an object is equal to the product between the mass m of the object and its acceleration:
So, when static friction is acting on the object, if the object is still not moving we know that all the forces are balanced: in fact, since the object is stationary, its acceleration is zero, and so the resultant of the forces (left term in the formula) must be zero as well (i.e. the forces are balanced).