School

University of OttawaDepartment

PhysicsCourse Code

PHY 1331Professor

Andrzej CzajkowskiStudy Guide

FinalThis

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PHY1321/1331 exam

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Principles of Physics I

PHY1321

PHY1331

Instructor: Dr. Andrzej Czajkowski

Final Exam

December 17 2014

Closed book exam

10 pages

33 questions of equal value

15 correct answers pass the test!

Duration: 3 hrs

RETURN ONLY THE SCANTRON SHEET!

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Andrzej Czajkowski

PHY1321/1331 exam

Page 2 out of 10

1 3kg mass rests on the flat surface while being acted on by the vertical 10N force

as. If g=9.9m/s2 the normal force acting on this body is equal to :

A 39.7N B 29.4N C 3.94N D 0N E 2.94 N

2 Two friends pull on the rope from opposite sides. If they are not moving with

respect to each other and one of them pulls with the force of 300N the tension in

the rope is___

a) 300N b) 0N c)600N d) it is impossible to answer

e) none of the above

3. If

A i j=−12 16

and

B i j=−+24 10

, what is the direction (with respect to the X axis) of the

vector

C A B=−2

?

a) –49° b) –41° c) –90° d) +49° e) +221°

4 . At which point on the velocity-time graph is the

acceleration negative?

a. A b. B c. C

d. D e. E

5 In the elastic collision of two or more particles the following are conserved:

A mass B linear momentum C kinetic energy

D all of the above E none of the above

6 Three rods of length L and mass M each, and the

point-particle of mass M, are placed as shown

below. The coordinates of the centre of mass of

such system are:

A xCOM = L/4 yCOM = - L/4

B xCOM = -L/2 yCOM = L/2

C xCOM = -L/4 yCOM = -L/2

D xCOM = -L/4 yCOM = L/4

E none of the above

7. A cart of mass 2kg moving at speed +5m/s collides with another stationary cart of mass

3kg on air track (no friction), and the two stick together after the collision. What is

their velocity after colliding?

A 2 m/s B 1m/s C -1m/s D -2m/s E none of the above

3kg

A

B

CD

E

v

t

y

L/2

L/2

x

-L/2

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Andrzej Czajkowski

PHY1321/1331 exam

Page 3 out of 10

8. The specific heat at constant volume at 0°C of one mole of a diatomic gas is

a.

R

2

1

. b.

R

. c.

R

2

3

. d.2

R

. e.

R

2

5

.

9. A 0.3kg particle moves from the initial position r1(3i-5j -13k)m to r2(3i-5j +7k)m while

net force F(5i-7j +3k)N is acting on it. What is the work done by a force on the

particle as it moves from initial to final position?

A 2.9 J B 40J C 54J D 60J E 64 J

10 A reversible heat engine has a pV

diagram shown on the graph.

The net work performed in one cycle

is approximately:

a) 0 kJ b) 2.0kJ

c) 4.2kJ d) 5.5kJ

e) 10kJ

11. A steam engine absorbs 1500 J of heat and performs 500 J of mechanical work in each

cycle. The efficiency of the engine is

a.80% b.60% c.50% d.33% e.20%

12. A 5.0-kg object is suspended by a string from the ceiling of an elevator that is

accelerating downward at a rate of 2.6 m/s2. What is the tension in the string?

A) 49 N B) 36 N C) 62 N D) 13 N E) 52 N

13 . Some species of whales can dive to depths of 1 kilometer. What is the total pressure they

experience at this depth? (

r

sea = 1020 kg/m3 and 105 N/m2 = 1 ATM.)

A) 9 ATM B) 90 ATM C) 101 ATM D) 111 ATM E) 130 ATM

14 A hoop has a mass of 200g and a radius of 25cm (ICM = MR2 ). It rolls without

sliding along level ground at VCM = 5m/s. Its total kinetic energy is:

A) 2.5 J

B) 5 J

C) 10 J

D) 250 J

E) impossible to establish without extra information

3000

1000

2000

4000

V(m3)

1

P (Pa)

3

2

4

5

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