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Foundation Physics For It Question Paper
Foundation Physics For It
Course:Bachelor Of Science In Information Technology
Institution: Kca University question papers
Exam Year:2009
UNIVERSITY EXAMINATIONS: 2008/2009
FIRST YEAR EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE IN INFORMATION TECHNOLOGY
BIT 1102: FOUNDATION PHYSICS FOR IT
DATE: AUGUST 2009 TIME: 2 HOURS
INSTRUCTIONS: Answer question ONE and any other TWO questions
Some constants: c = 3.0 x 108 ms-1, Planck’s constant, h = 6.26 x 10-34 Js, Acceleration due to
gravity, g = 9.81 ms-2,
1 mile = 1609 meters
1 foot = 0.3048 meters
1 mile = 5280 feet
1 hour = 3600 seconds
1 meter = 100 cm
1 kg = 100grams
QUESTION ONE
a) (i) Convert 66ft/s to miles per hour. [2 Marks]
(ii) The speed of light is 299, 792,458 m/s or 3 X 108 m/s. How many miles per hour is this?
[2 Marks]
b) Use dimensional analysis to answer the following:
(i) Determine the dimensions and units of the following quantities: Volume, peed,
acceleration and density [4 Marks]
(ii) Consider the equation: 3
2
y = x + 1 kx . In this equation x and y both have are lengths and ½ is
dimensionless number. Determine the dimensions of k. [2 Marks]
2
(iii)You are given the equation
R
F rlv= - 2p ? ,
where
F is force
r is radius
is length
v is speed
R is distance
involving force, radius, length, speed, and distance. Find the dimensions and SI units of eta,
(?), which is a viscosity. [4 Marks]
c) Determine the energy carried by photons of radio waves and gamma rays with wavelengths of
100m and 10-6 m respectively. (c= 3.0x108m/s) [6 Marks]
QUESTION TWO
A cyclist is travelling at a constant speed of 4ms-1.
(a) Sketch a graph of speed against time for t= 0 to t=10s. [4 Marks]
(b) What is the gradient of the graph? [2 Marks]
(c) What does this represent? [2 Marks]
(d) Use the graph to find the distance travelled between:
(i) t = 0 and t = 2, [2 Marks]
(ii) t = 2 and t = 5, [2 Marks]
(iii) t = 0 and t = 10. [2 Marks]
(e) Sketch the graph of distance travelled against time. [3 Marks]
(i) What is the relationship between this graph and the speed of the cyclist? [3 Marks]
QUESTION THREE
a) List three assumptions that are made when analyzing the motion of objects Projected either
horizontally or at an angle? [3
Marks]
b) Define the work done by a constant force, and show that the work is a Scalar quantity. [4 Marks]
c) A 3-kg block pushed up an inclined plane a distance of 2 m by a force of 40 N. Assuming that the
surface is smooth and the angle of is 37o.
3
(i) What is the work done by the 40 N forces? [4 Marks]
(ii) What is the work done by the gravity? [4 Marks]
d) A 50.0-kg crate pulled 40.0 m by a constant force of 100 N at an angle of 37.0o. A frictional force
of 50 N is exerted to the crate.
(i) Determine the work done by the pulling agent. [2 Marks]
(ii) What is the work done by friction? [2 Marks]
(iii) Find the net work done. [1 Mark]
QUESTION FOUR
a) What is matter? [1 Mark]
b) List four states of matter. [4 Marks]
c) Give the basis of Classification of the four types [3 Marks]
d) What can be said about the speed of an object if the net work done on the object is zero?
[2 Marks]
e) State work-energy theorem and write a mathematical expression for it. [4 Marks]
f) A car of mass 1000 kg breaks to a halt from a speed of 60 km hr-1 in a distance of 40m.
Determine the frictional force. [6 Marks]
QUESTION FIVE
a) Define a wave. [2 Marks]
b) Explain the difference between transverse and longitudinal wave. [2 Marks]
c) Draw a wave versus time graph and identify the following properties wavelength, amplitude
and period. [4 Marks]
d) If a source oscillates every 5 seconds: Find its period and frequency [3 Marks]
e) Define Doppler effect. [3 Marks]
f) Train A and B are heading toward each other. Train A moves at 21 m/s and the driver toots his
horn. The horn sounds at 650 Hz. How fast should B be moving so that its driver hears the
horn at 750 Hz? Assume the speed of sound is 343 m/s. [6 Marks]
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