- 3.flashlight beam strikes the surface of a pane of glass (n=1.56) at a 67 angle to the normal .What is the angle of refraction [1]?
- 2. The speed of light in a certain substance is 82% of its value in water. What is the index of refraction of that substance 1
- Benocun en MCT Cbeamaer cropkn ABMrancb m pasHoyckopeHHO . 3a BpeMF cnycka ero ckopoctb yeenutunacb Ha 13M/c . yckopenne Benocunenucra 0,25M/c^2 CKonbko BpeMeHM Anurce cnyck? 0.52 c 20 0.25 c 52 c
- (a) A projectile is fired from the ground with an initial velocity u at an angle Theta to the horizontal. It returns to the same horizontal level.Find: (i) the time of flight. (5 Marks) (ii) the horizontal range , R. (4 Marks) (iii) the equation of the trajectory. (3 Marks) (b) A ball is thrown at 21m/s at 30^circ above the horizontal from the top of a roof 16 m high.Find: (i) the maximum height reached. (3 Marks) (ii) the time of flight. (5 Marks) Question 5 (a)(1) State Newton's law of universal gravitation. Mark) (ii) A satellite orbits the earth at a considerable distance R from the center of the earth in the plane of the equator and in the same direction of rotation as the earth. Show that the period of the satellite T is given by T^2=(4pi R^3)/(gr^2) where g is the gravitational acceleration and r is the radius of the earth. (8 Marks) (iii) If R=25000 km, find T. (2 Marks) 1
- Some constants which you may find useful Specific heat capacity of water=4200 jkg^-1K^-1 Latent heat of fusion of ice=334J/g Radius of thc sun=6.96times 10^8m Specific heat capacity of copper=390Jkg^-1K^-1 Molar gas constant R=8.31JK^-1Kmol^-1 QUESTION ONE (30 MARKS) a) Briefly define the following terms (i) Internal energy (1 Mark) (ii) Heat (1 Mark) b) State the Zeroth Law of thermodynamics (1 Mark) c) When do we say two bodies are in thermal equilibrium? (1 Mark) d) Define the following terms: (i) Thermal capacity (1 Mark) (ii) Specific heat capacity (1 Mark) e) A metal of mass 0.2 kg at 100^circ C is dropped into 0.8 kg of water at 15^circ C contained in a container of mass 012 kg and specific heat capacity=400Jkg^-1K^-1 . The final temperature reached is 35^circ C Assuming no heat losses calculate the specific heat capacity of the metal. (5 Marks)
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