8Question 1: The New River Gorge bridge in West Virginia is a 518 metre long steel arch. How much will its length change between temperature extremes of -20°C and 35°C? The coefficient of linear expansion of steel is 11 × 10-6/°C.
Question 2: How much heat is required to change 2kg of ice at –10°C to steam at 120°C? c ice = 2090J/kg°C, c water = 4200J/kg°C, c steam = 2010J/kg°C. Lf = 335 000J/kg, Lv = 2 250 000J/kg.
Question 3: In an experiment 200kg of aluminium (c = 880 J/kg°C) at 100°C is dropped into 256kg of kerosene at 15°C. The mixture reaches a temperature of 50°C. What is the specific heat of kerosene?
Question 4: A note of frequency 250Hz is transmitted through air with a velocity of 350m/s. The wave passes into water through which it travels with a velocity of 1800m/s.
What is the wavelength of the wave in air and in water?
Question 5: A ray of light is incident from air (n = 1.00) at an angle of 40° to the surface of some carbon disulphide (n = 1.63). Find the angle of refraction.
Question 6 : What is the critical angle for light passing from a diamond (n = 2.4) into air? Does this explain the sparkle of a diamond?
Question 7: An object 10cm high is placed 8cm from a convex lens of focal length 10cm. Describe the image.