Physics CA (PHYS2226)
Biological Science - BS
Semester: Second Semester
Level: 200
Year: 2018
REPUBLIC OF CAMEROON REPUBLIQUE DU CAMEROUN
Peace-Work-Fatherland Paix-Travail-Patrie
MINISTER OF HIGHER EDUCATION MINISTERE DE L’ENSEIGNEMENT SUPERIER
THE UNIVERSITY OF BAMENDA
UNIVERSITE DE BAMENDA
FACULTY OF SCIENCE
FACULTE DES SCIENCES
P.O. Box 39 Bambili
Tell: (+237) 22 81 63 50
PHYS2226: General Physics
Continuous Assessment Time: 1hr.20 minutes
INSTRUCTIONS: Answer all questions. Questions carry equal marks
1)
Consider two vectors :
A = -i + 2j + 5k and B = 2i + 3j -2k
(a)
Find the magnitude of each
(b)
Find the vector sum and its magnitude
(c)
Find their scalar product
(d)
Find the vector product A x B
(e)
Find the product A. (B x C) if C = -A
2)
A particle moves in the xy-plane with acceleration a = bt
2
i + ctj
(a)
What are the units of b and c
(b)
Assuming that b and c are = 2 and 4 units respectively and that the particle is at rest
at the origin at time t = 0, derive expressions for the velocity and position vectors.
3)
A car moves 3 km at 30° north-east, 2 km east then 1km north.
(a)
Find the distance of the car from the starting point
(b)
What is the position of the car?
(c)
In what direction is the car heading?
4)
The velocity of a car is given by v = 10 + 2t
2
(a)
Find the change in velocity of the car in the time interval t
1
= 2 s and t
2
= 5
(b)
Find the average acceleration in this time interval
(c) Derive an expression for the instantaneous acceleration at any time and find the
acceleration at t=2s and at t=5s
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