CONFIDENTIAL

SULTAN IDRIS EDUCATION UN1VERSlTY

UNIVERSITI PENOIOIKAN SULTAN lORIS

FINAL EXAMINATIONSEMESTER 2 SESSION 2015/2016

CODE

DATECOURSE BASIC PHYSICS I: SFU1013

o 4 MAR 2016 DURATION: 2 HOURS

INSTRUCTIONS

1. This question paper consists of TWO parts: Part A and Part B.2. Answer ALL questions in Part A in the provided OMR form.3. Part B consists of 3 questions. Answer ALL questions in the provided answer

booklet.4. The usage of scientific calculator is allowed.5. This question paper will be collected at the end of the examination.

This question paper contains 15 pages including the cover page.

PROGRAMME:---------------------

YEAR: GROUP:---

REGISTRATION NO. :_

I DENTI FICATION CARD NO. :1'----'_--'--___,__....___----L....----'_--'--__,__....___----L....----'-----'LECTURER: DR. MOHD ROZNI MOHD YUSOF (Group C,E,I)

MR. ROSZAIRI HARON (Group A,D,J)DR. NURUL SYAFIQAH YAP ABDULLAH (Group B)DR. NORZAIDI MAT NAWI (Group G,H)DR. RAZAKABD SAMAD YAHYA (Group F)

DO NOT OPEN THIS QUESTION PAPERUNTIL YOU ARE INSTRUCTED TO DO SO

CONFIDENTIAL

SFUI013 BASICPHYSICS I 2

SECTION A (30 Marks)This section contains 30 questions. Answer ALL of them.

1. The following table shows the basic measurements and its unit. Which one is NOT a

correct unit?

Type of Measurement SI Unit

A. Length m

B. Area m3

C. Time s

D. Mass kg

2. If the side of the cube is 2.25 em, what is its volume?

A. 4.67 cnr'

B. 5.06 crrr'

C. 9.6 cnr'

D. 11.39 crrr'

3. The volume of a liquid is 20.5 mL. Which of the following sets ofmeasurement

represents the value with good accuracy?

A. 19.9 mL, 19.0 mL, 20.2 mL, 18.8 mL

B. 20.1 mL, 17.8 mL, 19.6 mL, 17.2 mL

C. 20.2 mL, 20.5 mL, 20.3 mL, 20.1 mL

D. 21.5 mL, 21.9 mL, 22.0 mL, 21.7 mL

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SFUI013 BASICPHYSICSI 3

4. Vector mathematics means addition and subtraction of

A. magnitudeB. magnitude according to direction

C. magnitude according to unit

D. Both B and C

5. If two forces of20 N towards north and 12 N towards south are acting on an object,what will be the resultant force?

A. 32 N towards north

B. 32 N towards south

c. 8 N towards south

D. 8 N towards north

6. The speed of the Kiffah bus is 40 ms". After 10 seconds, its speed decreases to

20 ms'. Determine its deceleration.

A. 1 ms-2

B. 2 ms-2

C. 4 ms-2

D. 5 ms?

7. A ball is dropped from a balloon going up at a speed of 10 ms' when the balloon is at

height of 50 m. Predict the velocity of the ball when it strikes the ground? Assume

g= 9.8 ms",

A. 31 ms"

B. 33 ms"

C. 35 ms"

D. 37 ms"

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SFUIOI3 BASICPHYSICSI 4

8. Object A is dropped from the roof of a tall office building and a short while later, an

object B is dropped from the same roof. At t seconds after the object B was dropped,

object B has velocity 20 ms' and A has velocity 24 ms'. What is the difference

between the speeds of the two objects at (t + 3) seconds after object B was dropped?

A. 4 ms"

B. 7 ms"

c. 10 ms"

D. 45 ms"

9. The relationship of the change in length of a stretched or compressed object to the

force causing the change is given by

A. Pascal's Law

B. Newton's Law

C. Hooke's Law

D. Archimedes' Principle

10. A force of 10 N is applied to a spring whose elastic constant is 0.35 Ncm". Find its

change in length

A. 28.6 em

B. 32.5 em

C. 38.0 em

D. 41.1 em

11. Find the mass density of a ball bearing whieh has mass of 50 g and radius 0.02 m.

A. 1.50 kg/nr'B. 29.0 kg/nr'C. 1490 kg/rrr'D. 7160 kg/nr'

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SFUI013 BASICPHYSICSI 5

12. A mercury barometer shows a reading of760 mmHg. What is the atmospheric

pressure? (Density ofmercury = 1.36x 104 kgm")

A. 0.76 Pa

B. 10.1 kPa

C. 101 kPa

D. 10100 kPa

13. A boat carrying a large stone is floating on a lake. The stone is thrown outside the boat

and sinks. The water level in the lake (with respect to the shore)

A. rises

B. dropsC. remains the same

D. None of the above

14. FIGURE 1 shows a manometer connected to a gas tank. Determine the pressure of the

gas in the tank. (Atmospheric pressure = 76 cmHg)

Gas Tank

A. 5 cmHgB. 71 cmHgC. 76cmHgD. 83 cmHg

Atmosphericpressure

Monometer

Mercury

FIGURE 1

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SFUI013 BASICPHYSICS I 6

15. Water flows through a fire hose of diameter 6 em at a speed of 5 ms". Find the flow

rate of the fire hose in Lmin",

A. 848 Lmin'

B. 14.1 Lmin"

C. 71.5 Lmin"

D. 3780 Lmin"

16. A satellite is orbiting the Earth in space. Calculate the velocity needed for the satellite

to maintain a circular orbit 1200 km above the surface of the Earth.

(Gravitational constant G= 6.674x10-11 Nm2kg-2 ,radius ofEarth = 6371 km, mass of

Earth = 5.972x1024 kg).

A. 2.29 x 105 ms'

B. 7.26x103 ms'

C. 5.26x107 ms"

D. 1.22x 103 ms"

17. If a satellite is moving at 1200 km above the surface of the Earth, at a different

velocity than for circular orbit, how would it move?

A. Straight line at a tangent.

B. Elliptical (oval) orbit.

C. Larger circular orbit with Earth at the centre.

D. Smaller circular orbit with Earth at the centre.

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SFU1013 BASICPHYSICS I 7

Questions 18-20 refer to FIGURE 2 below.

A pendulum has the length of string 0.2 m, and the mass of the pendulum bob is 100 g. The

pendulum is pulled to the side so that the string is 90° from the original position .

• \ ,90�

110.2 m

II

100geFIGURE 2

18. Calculate the maximum potential energy ofthe pendulum.

A. 0.2 J

B. 2 J

C. 20 J

D. 200 J

19. Calculate the maximum speed ofthe pendulum bob after it is released.

A. 0.50 ms"

B. 0.99 ms"

C. 1.98 ms"

D. 3.96 ms"

20. Name the law used for calculating the answer in Question 19.

A. Conservation of Linear Momentum

B. Conservation ofAngular Momentum

C. Universal Law of Gravitation

D. Conservation ofMechanical Energy

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SFUI013 BASICPHYSICS I 8

21. A catapult is built with a throwing arm 5 m long, as shown in FIGURE 3 below. A

stone with mass 10 kg is put into the stationary cup as seen in FIGURE 3(a). The

catapult is fired as shown in FIGURE 3(b) and accelerated at 112 ms". Calculate the

torque needed to throw the stone.

-(Sm

>

'eo 0

(a)10 kg

o c::::>

FIGURE 3

A. 224Nm

B. 560Nm

C. 1120Nm

D. 5600Nm

22. An electric motor with 50 W power is used to lift a 25 kg container ofwater at

constant velocity. How fast does the container rise?

A. 1 ms"

B. 2 ms'

C. 0.2 ms"

D. 0.5 ms"

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SFUI013 BASIC PHYSICS I 9

Questions 23-24 refers to FIGURE 4 below.

A rocket engine produces 1200 N of thrust, pushing a missile that has mass 10 kg, as shown

in FIGURE 4 below. The rocket engine develops a leak, and a small flame develops pointing30° away from the main flame, producing 300 N of thrust.

FIGURE 4

23. Calculate the magnitude of the resulting acceleration.

A. 90.0 ms-2

B. 146.6 ms-2

C. 150.0 ms-2

D. 154.4 ms-2

24. Calculate the angle of the resulting acceleration (with respect to the+x axis).

A. 3.5°

B. 5.9°

C. 14.0°

D. 84.1°

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SFUI013 BASICPHYSICS I 10

25. A wind turbine is turning clockwise at 0.85 rads", The wind strengthens, causing the

turbine to experience a clockwise angular acceleration of 0.044 rads'". After 15

seconds, how fast is the turbine turning?

A. 0.56 rads"

B. 1.5 rads"

c. 4.1 rads'

D. 6.1 rads"

26. A soldier is aiming his RPG-7 rocket launcher, aiming up 40° with respect to the

ground. If the launch velocity is 110 ms", calculate its range.

A. 335 m

B. 450m

c. 880m

D. 1,213 m

27. A 20,000 kg truck collides with a 1,000 kg car and causes a lot of damage to the car.

What cause a lot of damage on the car?

A. The force on the truck is greater than the force on the car

B. The force on the truck is equal to the force on the car

c. The force on the truck is smaller than the force on the car

D. The truck did not slow down during the collision

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SFUI013 BASICPHYSICS I 11

28. You are playing snooker, and you hit the white ball to move 0.5 ms", as shown inFIGURE 5. The white ball hits a stationary black ball, but not at the centre. The

white ball is deflected 30° from its original direction, going with speed 0.2 ms'. What

is the angle of the black ball (relative to the original direction of the white ball)?Assume all the balls have the same mass, 0.2 kg.

�.

FIGURES

A. 17°

B. 30°

C. 62°

D. 80°

29. Referring to Question 28, calculate the velocity of the black ball after collision.

A. 0.14 ms"

B. 0.20 ms"

C. 0.34 ms"

D. 0.68 ms"

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SFUI013 BASICPHYSICS I 12

30. You are hit by a small car when coming back from playing snooker. The car has a

mass of 650 kg and traveling at 30 ms" and when it hits you. After hitting, the car still

has velocity of 25 ms". If your mass is 70 kg, calculate your velocity after the impact.Assume elastic collision, and your initial velocity was zero.

A. 6 ms"

B. 16 ms"

c. 36 ms"

D. 46 ms"

EndofSection A

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SFUI013 BASICPHYSICS I 13

SECTION B (30 Marks)This section contains 3 questions. Answer ALL questions.

1. A carpenter uses a hammer to drive a nail into wooden plank to build a chair. The

mass of the hammer-head is 1.3 kg. The average velocity of the hammer-head is

4.3 ms" at the moment it strikes the nail. The nail then travels 25 mm deep into the

wood.

(a) State the transformation of energy that took place in the situation above.

[2 marks]

(b) What is the average energy of the hammer-head at the moment it strikes the

nail?

[3 marks]

(c) Determine the average force exerted by the hammer-head on the nail.

[3 marks]

(d) What is the force exerted by the nail on the hammer-head?

[2 marks]

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SFUI013 BASICPHYSICS I 14

2. (a) Define Hooke's Law.

[1 Mark]

(b) A spring is stretched 12 em when 8 kg mass is suspended below it.

(i) How far will it stretch if a force of 100 N is applied?[3 Marks]

(ii) What is the value ofmass needed to stretch the spring 5 em?

[1 Mark]

(c) Define Archimedes' Principle.[1 Mark]

(d) A crane lifts the 20,000 kg steel box out of the water. Given that the density of

water, Pwater and the box, Pbox is 1000 kgm" and 8000 kgm" respectively,determine the tension in the crane's cable when

(i) the box is submerged in the water.

[2 Marks](ii) the box is completely out of the water.

[2 Marks]

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;FUI013 BASICPHYSICS I 15

3. (a) Differentiate between static and kinetic friction.

[2 Marks]

(b) A force of 48 N is required to start a 5 kg box moving across a horizontal

concrete floor.

(i) What is the coefficient of static friction between the box and the floor?

[2 Marks]

(ii) If the 48 N force continues, the box accelerates at 0.7 ms". What is the

coefficient ofkinetic friction?

[2 Marks]

(c)

A B

FIGURE 6

FIGURE 6 shows a 58 kg person stands at its tip of the diving board.

Calculate the forces, FA and FB that the supports exert on the diving board.

Ignore the weight of the board and assume the board's centre of gravity is at itscentre.

[4 Marks]

END OF QUESTIONS