Compared to the thickness and density of the continental crust of South America, the oceanic crust of the Pacific floor is______
1 answer:
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Answer:
d = 1.15 m
Explanation:
- In absence of friction, the change in kinetic energy of the combined mass of the monkey and the sled, must be equal (with opposite sign), to the change in gravitational potential energy:
ΔK = -ΔU
- When friction is not negligible, the change in mechanical energy, must be equal to the work done by non-conservative forces (kinetic friction in this case):
ΔK + ΔU = Wnc (1)
- As the monkey + sled reach to the maximum distance up the incline, they will come momentarily to a stop, so the final kinetic energy is 0.
- The change in gravitational energy, can be written as follows:
- The sum of these two quantities, must be equal to the work done by the friction force, along the distance d up the incline:
- The normal force, always normal to the surface, must be equal and opposite to the component of the weight normal to the incline:
- Replacing in the equation for Wnc:
- We can return to the equation (1) and solve for d:
This is the solution of the problem. The problem is calculated from a closed system energy balance equation
