You are mixing water with ice in an insulated container. The temperature of the ice is initially below its freezing point. The following are given:. the amount of heat absorbed by the ice if heated to its melting point: 400 J,
the amount of heat absorbed by the ice if it all melts (which includes the heat needed to bring the ice to its melting point): 2100 J,
the amount of heat given off by the water if cooled to its freezing point: 2400 J, and
the amount of heat given off by the water if it all freezes (which includes the heat needed to bring the water to its freezing point): 5200 J.
Based on this information, at equilibrium, which phases are present?

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

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.