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Basic Physics 1 Question Paper
Basic Physics 1
Course:Bachelor Of Science In Physics
Institution: Maasai Mara University question papers
Exam Year:2010
NAROK UNIVERSITY COLLEGE
(A CONSTITUENT COLLEGE OF MOI UNIVERSITY)
UNIVERSITY EXAMINATIONS 2011/2012
FIRST YEAR FIRST SEMESTER EXAMINATION
SCHOOL OF SCIENCE
UNIVERSITY EXAMINATIONS FOR THE DEGREE OF BACHELOR OF SCIENCE (COMPUTER, WILDLIFE MANAGEMENT, INFORMATION SCIENCE), BACHELOR OF SCIENCE AND BACHELOR OF EDUCATION (SCIENCE)
COURSE CODE: PHY110
COURSE TITLE: BASIC PHYSICS I
DATE: DECEMBER, 2011 TIME: 3 HOURS
INSTRUCTIONS
- Answer Question ONE and any other TWO Questions.
- Use of sketch diagrams where necessary and brief illustrations are encouraged.
- Read the instructions on the answer booklet keenly and adhere to them.
PHYSICAL CONSTANTS
- Acceleration due to gravity, g = 9.8 ms-2
? This paper consists of __3___ printed pages.
QUESTION ONE: 30 MARKS
a) State four temperature scales you know. [2]
b) Determine a unit vector perpendicular to the plane and [4]
c) The maximum range of a projectile occurs when it is launched at an angle of 45.0° with the horizontal, if air resistance is neglected. If air resistance is not neglected, will the optimum angle be greater or less than 45.0°? Explain. [3]
d) An aluminum plate (a = 24´10-6) has a circular hole cut in it. A copper ball (solid sphere, a = 17´10-6) has exactly the same diameter as the hole when both are at room temperature, and hence can just barely be pushed through it. If both the plate and the ball are now heated up to a few hundred degrees Celsius, will the ball and the hole fit ? Explain [3]
e) An automobile moving at 30.0 m/s is approaching a factory whistle that has a frequency of 500 Hz.
(i) If the speed of sound in air is 340 m/s, what is the apparent frequency of the whistle as heard by the driver? [3]
(ii) Repeat for the case of the car leaving the factory at the same speed. [3]
f) Identify four types of thermodynamic processes. [2]
g) Derive the relationship between internal energy; U; and temperature ;T;(for monatomic ideal gas), is given by [4]
h) Explain the terms angular momentum and torque as used in angular motion[4]
i) Lead has a greater density than iron, and both are denser than water. Is the buoyant force on a lead object greater than, less than, or equal to the buoyant force on an iron object of the same volume? [2]
QUESTION TWO: 20 MARKS
a) Define the following terms used in simple Harmonic motion.
(i) Displacement [2]
(ii) Amplitude [2]
(iii) Period [2]
b) Consider the motion of a mass (m) attached to a string (length, l), show that the period of its motion is given by T = 2p(l/g)½ [6]
c) A simple pendulum is used in Narok physics laboratory experiment to obtain an experimental value for the gravitational acceleration, g. A student measures the length of the pendulum to be 0.510 meters, displaces it 10 o from the equilibrium position, and releases it. Using a stopwatch, the student determines that the period of the pendulum is 1.44 s. Determine the experimental value of the gravitational acceleration. [4]
d) What are your sources of error in the value obtained in (c) above? [4]
QUESTION THREE: 20 MARKS
a) People are uncomfortable wearing dark clothes during the summer. Why? [3]
b) Explain the three modes of heat transfer. [6]
c) A star has a surface temperature of about 2900 K and emits a power of approximately 4 x1030 W. Assuming that the star is a perfect emitter and spherical,
find its radius. [6]
d) Determine the temperature given by T in the fig. below. [5]
QUESTION FOUR: 20 MARKS
a) Define Elasticity [5]
b) Explain the terms Young’s Modulus, Shear Modulus and Bulk Modulus [3]
c) A solid brass sphere is initially surrounded by air, the air pressure exerted on it is 1.0 x 105 N/m² (normal atmospheric pressure) the sphere is lowered into the ocean to a depth which the pressure is 2.0 x 107 N/m². The volume of the sphere in air is 0.50 m³. By how much does this volume change once the sphere is submerged? [6]
d) We analyzed a cable used to support an actor as he swung onto the stage. The tension in the cable was 940 N. What diameter should a 10-m-long steel wire have if we do not want it to stretch more than 0.5cm under these conditions? [6]
QUESTION FIVE: 20 MARKS
a) What is frictional force? [2]
b) Explain four Types of Frictional forces [8]
c) Suppose that in Fig. below the block is at rest. The angle of the incline is slowly increased. At an angle ? = 42°, the block begins to slide. What is the coefficient of static friction between the block and the incline? [6]
d) Explain three ways to reduce friction [4]
The End
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