1. What would happen to this book's weight if you managed to double Earth's mass? What, if instead you doubled the book's mass? What if you doubled both ? What if you moved the book at 2R height above the Earth surface, where R is the radius of Earth ?

2. If you were orbiting Earth in a satellite 200 km above the ground, would you be weightless ? Would your weight be as large as it is when you are on the ground? Explain.

3. How many Joules in a Calorie? What is the difference between Joule and Watt ? You press a 500 N weight from your shoulders up to arm's length, a distance of 0.8 m, during a period of 2 seconds. How much work did you do? a) 800 W. b) 800 J. c) 400 J. d) 400 W. e) 200 W. f) 200 J. How much power output?

4. If you halve your altitude above the ground, how is your gravitational energy affected (relative to ground) ? If you are running at 20 m/hr and then suddenly halve the running speed, how is your gravitational energy affected? How is your kinetic energy affected?

5. What would be 113 degree F in Celcius? What would be 40 degree C in Fahrenheit? What is 0 degree Kelvin?

6. For every 100 kg of coal entering a generating plant every second, 15 kg of Sulphur oxides and ash are removed, producing a significant solid-waste disposal problem. For a 1000 MW plant, how much of this solid waste is produced every day ? (Assume the actual efficiency of coal plants to be 40% and 1 kg coal produces 25 MJ of thermal energy).

7. What are the First and the Second Laws of Thermodynamics? Do they contradict each other ? Explain how this applies to a refrigerator.

8. What is the energy of a photon of yellow light with a wavelength of 500 nm? How many such photons will make up 200 J of energy ?

9. What is the wavelength range of infrared radiation, of UV radiation, of visible light ?