POSSIBLE POINTS: 12 Performance Task #2
Armand is monitoring a large sealed tank by way of a sensor that records the liquid level over time on a graph. He looks at the graph and
claims that the sensor indicates there are waves in the liquid in the tank.
Tank Liquid Level vs. Time
116
113
NA
110
0.5
1.0
1.5
Time (s)
ANSWER PART 1 PART 2 AND PART 3:
• PART 1: EXPLAIN how Armand knows that there is a wave in the tank.
• PART 2: FIND the amplitude, in centimeters, and frequency, in cycles per second, of the wave.
• PART 3: Waves transmit energy from one place to another. IDENTIFY two properties of waves that affect the energy transmitted by a
wave

chemical energy --> gravitational potential energy --> kinetic energy --> elastic potential energy --> gravitational potential energy

explanation:

when emma starts the hike, the chemical energy stored in her body is used to climb up the mountain, and so she gains gravitational potential energy (because at the end, she will be at a higher height h above the ground). then she goes bungee jumping: as she falls, this gravitational potential energy is converted into kinetic energy (because her speed increases as she falls down), until the point when the rope stretches, and she stops moving. at that moment, all the kinetic energy is converted into elastic potential energy due to the stretching of the rope. then, this energy is released because the rope returns to its natural length, and emma gains a small increase in altitude , so she gains some gravitational potential energy.