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PHY1001

CONFIDENTIALPHY1001

CONFIDENTIAL

ADROIT COLLEGE

FINAL EXAMSEMESTER I 2013/2014

COURSE NAME:PHYSICS A(FIS)

COURSE CODE:PHY1001

DATE:

VENUE:EXAMINATION HALL 1

TIME

:2.00PM-5.00PM

MATRIX NO:

NAME OF PROGRAM:

DESK NO.

:

INSTRUCTIONS TO CANDIDATES The paper consists of THREE (3) sections A, B and C Candidates are required to answer ALL questions from section A and B and choose any 1 questions from section C.

The number of marks is given in bracket( ) at the end of each questionDO NOT OPEN THIS BOOKLET UNTIL INSTRUCTEDTHIS BOOKLET CONTAINS 10 PRINTED PAGESSECTION A (20 MARKS)Answer all questions 1. Kinetic energy has

A. Magnitude only

B. Magnitude and direction

C. Direction only

D. None of above

2. The dimension of spring constant, k is

A. MT-2

B. ML-3

C. MLT-2

D. ML-1 T-2

3. Car A has a mass of 1000kg and is moving at 60km/hr. Car B has a mass of 2000kg and is moving at 30km/hr. The kinetic energy of car A is

A. Half that of car B

B. Equal to that car B

C. Twice that of car B

D. 4 times that of car B

4. A ball is thrown upward at a speed of 12m/s. It will reach the top of its path in about?

A. 0.6s

B. 1.2s

C. 1.8s

D. 2.4s

5. A force of 6.00N acts at the origin in positive x-direction. A second force of 5.00N acts at the origin in positive y-direction. The magnitude of resultant force is

A. 7.8N

B. 8.5N

C. 0N

D. 12N

6. A 30kg girl and 25kg boy are standing on a frictionless roller skate. The girl pushes the boy who moves off at 1.0m/s. The girls speed is

A. 0.45 m/s

B. 0.55m/s

C. 0.83m/s

D. 1.2m/s

7. A washing machine, starting from rest, accelerates within 3.14 s to a point

where it is revolving at a frequency of 2.00 Hz. Its angular acceleration is

most nearly

A. 0.100 rad/s2

B. 0.637 rad/s2

C. 2.00 rad/s2

D. 4.00 rad/s2

8. A 25000kg rock is located at a distance of 7.6 x108 m away from a small planetof mass 7.8 x 1025kg. What is the mutual force of attraction between these

two objects? ( G=6.67 x 10-11N kg-2 m2)?

A. 200N

B. 150N

C. 225N

D. 500N

9. A ball rolls down an incline plane from 2m height. Calculate the speed of the

ball at the end of the plane

A. 6.87m/s

B. 4.47m/s

C. 8.09m/s

D. 2.22m/s

10. A car rounds a curve on a level road. The centripetal force on the car is provided by

A. inertia

B. gravity

C. friction between tires and the road

D. The force applied to the steering wheel

SECTION B (60 MARKS)Answer ALL Questions

1. a) Based on the curve above, determine

i. What is the acceleration and net displacement of the object between t=0 and t=2 ?

ii. What is the acceleration and net displacement of the object

between t=10 and t=12 iii. Describe the object's entire motion (6Marks)

b) A car is moving with a speed of 72kmh-1 and when the brake (4Marks)

is applied, the car experiences a deceleration of 4ms-2. Find the distance travelled from the moment the brake is applied until the car stops . 2. a) State Universal Law of gravitation and Keplers Law (4Marks) b) A washing machine spins its tub at a rate of 1800rev/min.

If the diameter of the tub is 40cm,find (i) Angular velocity of the tub (ii) Linear speed of the rim of the tube (iii) acceleration of the rim of the tube ( 6Marks)

3. a) Extension of a spring, x depends on the applied force, F

on the spring and a constant, k, as shown in the following

equation

F= kx

Determine the base units and dimensions of the constant k (5Marks) b) A force of 50N acts at an angle of 600 to the horizontal and

causes an object to move through a horizontal displacement

of 20m. Determine the work done by the applied force (5Marks)

SECTION C (20 MARKS)Answer Only One (1) Question A. a) Define and explain all THREE Newtonian laws with the aid of examples and formulaes (6 Marks)

40N

30025N

b) Figure above above shows an object of mass 5.0kg on a

smooth surface being pulled by two forced of 40N and 25N. (Assume g=9.81ms-2) Calculate i) the resultant force along the horizontal surface ii) the acceleration along the horizontal surface iii) the resultant force on vertical direction (4 Marks) c) Define linear momentum. What is the relationship between

force and linear momentum (5 Marks)

d) Two identical objects, P and Q with a mass 5kg move towards (5Marks) each other along a smooth horizontal surface with a velocity

of 20m/s and 14m/s respectively.The two objects then collide and object Q stops after the collision. Calculate the velocity of P after

the collision

2. a) State Hookes Law. What is elastic energy? (4Marks). b) An object of mass 3kg travels from rest along the x-axis from

x=0.0m to x=3.0m, determine.

i) the work done, ii) the change in potential energy (6Marks)

iii) the velocity of the object at x=3.0m F(N)

9

3c) A 70kg woman carries a 40kg load on her head along an inclined (4marks)

plane of vertical height 5.0m in 5minutes. Calculate the rate of work

done by the women.d) Derive the formula for kinetic energy from equations of motion (6marks)- Question Paper Ends -

3

0

x/m

5kg

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