8 METERS NOT 10... THANKS PRACTICE IT: A 61.0 kg skier is at the top of a slope,

Question

8 METERS NOT 10... THANKS

PRACTICE IT:

A 61.0 kg skier is at the top of a slope, as shown in the figure. At the initial point (a) , she is 8.0 m vertically above point (b).

A:

Setting the zero level for gravitational potential energy at (b), find the gravitational potential energy of this system when the skier is at (a) and then at (b). Finally, find the change in potential energy of the skier-Earth system as the skier goes from point (a) to point (b).

PEi = 4782.4 J

PEf = 0 J

deltaPE = -4782.4 J

B:

Repeat this problem with the zero-level at point .

PEi = 0 J

PEf = -4782.4 J

deltaPE = -4782.4 J

C:

Repeat again, with the zero level 2.00 m higher than point .

PEi = 3586.8 J

PEf = -1195.6 J

deltaPE = -4782.4 J

Use the values from PRACTICE IT to help you work this exercise. If the zero level for the gravitational potential energy is selected to be midway down the slope,4.00m above point(b), find the initial potential energy, the final potential energy, and the change in potential energy as the skier goes from point(a)to(b)in the figure.

Explanation / Answer

pe = mgh i = 2.391KJ final = -2.391KJ change = - 4.78KJ

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