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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: 2009/2010
FIRST YEAR EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE IN INFORMATION TECHNOLOGY
BIT 1102: FOUNDATION PHYSICS FOR IT
DATE: DECEMBER 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
QUESTION ONE
a) Using dimensional analysis, check the following equations for validity:
(i) The equation for the volume of a cylinder of radius r and height h given by; V = pr 2h
[2 Marks]
(ii) Energy E of a mass m travelling at the speed of light c; E = mc2 [2 Marks]
b) A car is moving along a straight line. It is taken from rest to a velocity of 20ms-1 by a constant
acceleration of 5ms-2. It maintains a constant velocity of 20ms-1 for 5 seconds and then is brought
to rest again by a constant acceleration of -2ms-2. Sketch a velocity-time graph and find the
distance covered by the car. [2 Marks]
c) A particle is moving in a straight line with constant acceleration, which has a velocity of 2 mS-1 at
one instant and 3 seconds later has a velocity 8 ms-1. Sketch a graph of speed against time.
[2 Marks]
d) (i)The speed of a car increases at a constant rate from 0 to 15ms-1 is a 10 second interval. Sketch
a graph to show the speed of the car against time. [2 Marks]
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(ii) Find the gradient of the line and describe what information this gives about the motion of the
car. [2 Marks]
(iii) Find the distance travelled by the car between: t = 0 and t = 5, t = 0 and t = 10s [2 Marks]
(iv) Use this information to sketch a graph of distance against time. [2 Marks]
(v) What is the relationship between the gradient of this graph and the speed of the car?
[2 Marks]
e) Define a wave. [2 Marks]
f) Explain the difference between transverse and longitudinal wave. [2 Marks]
g) Draw a wave versus time graph and identify the following properties wavelength, amplitude and
period. [3 Marks]
h) If a source oscillates every 10 seconds: Find its period and frequency [3 Marks]
i) Define Doppler effect. [2 Marks]
QUESTION TWO
a) Given three vectors; V1 = 4i – 8j, V2 = i + j, and V3 = -2i + 4j.
(i) Determine the magnitude and direction of each vector. [4 Marks]
(ii) Determine the sum of the three vectors. [4 Marks]
(iii) Determine V1 – V2 + V3. [4 Marks]
b) Given the vectors A and B shown in the fig.1
(i) Determine B – A. [3 Marks]
(ii) Determine A – B without using your answer in (i). [3 Marks]
Then compare your results and see if they are opposite. [2 Marks]
Fig. 1
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QUESTION THREE
A football is kicked at an angle of 0 ? = 37o with a velocity of 20.0 m/s, as shown. Calculate:
a) The maximum height, [4 Marks]
b) The time of travel before the ball hits the ground, [4 Marks]
c) How far away it hits the ground, [4 Marks]
d) The velocity vector at the maximum height, and [4 Marks]
e) The acceleration vector at the maximum height. Assume the ball leaves the foot at ground level
and ignore air resistance. [4 Marks]
QUESTION FOUR
a) State the three Newton’s laws [6 Marks]
b) A man weighs himself with a scale in an elevator. While the elevator is at rest, he measures a
weight of 800 N. [4 Marks]
c) What weight does the scale read if the elevator accelerates upward at 2.0 m/s2? [5 Marks]
d) What weight does the scale read if the elevator accelerates downward at 2.0 m/s2? [5 Marks]
QUESTION FIVE
a) A block of mass m1 on a rough, horizontal surface is connected to a ball of mass m2 by a
lightweight cord over a lightweight, frictionless pulley. A force of magnitude F at an angle ? with
the horizontal is applied to the block m1 and the block slides to the right. The coefficient of kinetic
friction between the block and surface is µk.
(i) Draw a diagram to represent the arrangement described above. [3 Marks]
(ii) Draw a free body diagram for the system [5 Marks]
(iii) Find the magnitude of acceleration of the two objects. [5 Marks]
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b) Suppose a block with a mass of 2.50 kg is resting on a ramp. If the coefficient of static friction
between the block and ramp is 0.350, what maximum angle can the ramp make with the horizontal
before the block starts to slip down? [7 Marks]
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