20 nt
1 point
What is Sally's GPE at position A
Type your answer
sard
A
es
21
1 point
What is Sally's KE at position A?
1
D
E
ndar
B
Type your answer...
2.
b
OX
С
22
1 point
tory
NU
What is Sally's TME at position A?
O meters
?
7
Type your answer
Help
19
Sally the skater is on the ramp above. She has a mass of 32.0 kg and has a
velocity of 0 m/s at position A. g = 10 m/s
Directions: Use your knowledge of Total Mechanical Energy and the Law of
Conservation of Energy for the following.
23
Fill in the first row of the table below wit
Complete the rest of the table

Lake happy times contains 100 km3 of pure water. it is fed by a river at a rate of 50 km3/yr. at time zero, there is a factory on one shore of lake happy times that begins introducing a pollutant to the lake at a rate of 2km3/yr. there is another river that is fed by lake happy times at a rate that keeps the volume of lake happy times constant. this means that the rate of flow from lake happy times into the outlet river is 52km3/yr. in turn, the flow from this outlet river goes into another lake, lake sad times, at an equal rate. finally, there is an outlet river from lake sad times flowing at a rate that keeps the volume of lake sad times at a constant 100 km3 . (a) find the amount of pollutant in lake sad times at the end of 3 months. (b) at the end of 3 months, observers close the factory due to environmental concerns and no further pollu- tant enters lake happy times. how long will it take for the pollutant in lake sad times (found in part (a)) to be cut in half?