(a)[1]
State the word that is used to describe the energy stored in the battery.
(b(i))[3]
Calculate the moment of the 3.0 N force about the pivot.
(b(ii))[2]
The student does work while opening the laptop. Explain how the principle of conservation of energy applies to this example.
(c)[2]
Give two advantages of using a solar panel, compared with using a mains electrical supply.
(d)[1]
Describe one disadvantage of using the solar panel, compared with using the mains battery charger.