Aquantity of gas (mean molecular weight 36.2) is compressed according to the law pv = constant, the initial pressure and volume being 1.03 bar and 0.98 m respectively. the temperature at the start of compression is 17°c and at the end it is 115°c. the amount of heat rejected during compression is 3.78 kj, cp = 0.92. calculate (i) value of n (ii) final pressure (iii) change in entropy

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.

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.