1. A television (65W), a refrigerator (1.2kw), an electric kettle( 650W), and 10 lamps (40 W each) are connected in series in a house. How much will it cost the house keeper to switch on all appliances for 24 hours if the cost of electricity is 15 kobo per kilowatt hour?
2. Outline the differences between solids, liquids and gases in terms of
a. The separation of the molecules
b. The motion of the molecules
c. The arrangement of the molecules throughout the bulky material
3. A force of 40 N stretches a wire through 3.0 cm. what force will stretch will stretch it through 5.0 cm and through what length will a force of 100 N stretch it? What assumption have you made?