Av Science

Question 1

The SI derived unit of voltage, the volt (V), is given by
A. 1 V = 1 J/C
B. 1 V = 1 J/A
C. 1 V = 1 A/C
D. 1 V = 1 kg m2/s

Answer 1

A. 1 V = 1 J/C

Question 2

The kinematic formula Δ𝜗 = 𝜔𝑖Δ𝑡 + 𝛼
2 (Δ𝑡)2 is valid for

A. rotational motion with constant angular acceleration only.
B. rotational motion with variable angular acceleration.
C. rotational motion with constant speed only.
D. rotational motion with constant velocity only

Answer 2

A. rotational motion with constant angular acceleration only

Question 3

Consider two carts that are pushed apart by an ideal massless spring. If we
consider a system composed of the two carts, then the system is
A. closed and non-isolated.
B. open and non-isolated.
C. closed and isolated.
D. open and isolated.

Answer 3

D. open and isolate

Question 4

The magnetic field surrounding a long, straight wire carrying a current of 𝐼 points
in the
A. outward (radially away from the wire) direction.
B. inward (radially towards the wire) direction.
C. azimuthal (around the wire) direction.
D. axial (along the wire) direction.

Answer 4

C. azimuthal (around the wire) direction.

Question 5

The electric force between a positively charged particle and a negatively charged
particle is
A. attractive.
B. repulsive.
C. zero.
D. opposite the direction of gravity for both particles

Answer 5

A. attractive.

Question 6

John hangs a 1.00-kg mass from the end of a set of scales made from a 2.00-m
piece of wood (the pivot point is at the midpoint of the rod). He finds that an
unknown mass m balances the scales when it is placed 0.30 m from the pivot.
What is m?
A. 1.5 kg
B. 3.0 kg
C. 6.0 kg
D. We cannot conclude anything about the mass.

Answer 6

B. 3.0 kg

Question 7

An aeroplane enters a horizontal turn by banking to the right with a constant
speed. The net force acting on the aircraft is:
A. zero.
B. upwards.
C. leftwards.
D. rightwards

Answer 7

D. rightwards

Question 8

Consider a system composed of the Earth and a single particle that is thrown from
an aircraft (the aircraft is not part of the system). We should describe the effect of
gravity on the system by using
A. the gravitational potential energy.
B. the gravitational force.
C. the gravitational potential energy or the gravitational force.
D. the gravitational potential energy and the gravitational force.

Answer 8

A. the gravitational potential energy.

Question 9

Which of these is in motion with a constant velocity?
A. A plane as it lifts off from the ground.
B. A skydiver as they jump from an aircraft.
C. A skater moving in a straight line across a frozen lake.
D. A skater turning to avoid someone who has fallen over

Answer 9

C. A skater moving in a straight line across a frozen lake.

Question 10

The work done on a particle by a force 𝐹⃗ as it moves through a displacement Δ𝑟⃗
is zero
A. only when the vectors are exactly parallel.
B. when the angle between the vectors is less than 90°.
C. when the angle between the vectors is more than 90°.
D. when the vectors are perpendicular.

Answer 10

when the vectors are perpendicular.

Question 11

The loop law ∑ℰ + ∑𝑉 = 0 is a consequence of applying which conservation law
to the flow of a current around a closed loop?
A. Conservation of angular momentum.
B. Conservation of electric charge.
C. Conservation of energy.
D. Conservation of momentum.

Answer 11

C. Conservation of energy.

Question 12

Resistances of 2.0 Ω, 4.0 Ω, and 6.0 Ω and a 24-V battery are all in series. The
current in the 2.0 Ω resistor is:
A. 2.0 A
B. 12 A
C. 2.4 A
D. 0.50 A

Answer 12

A. 2.0 A

Question 13

Alex and Cameron are ice skating. Alex has a mass of 45.0 kg and Cameron’s
mass is 60.0 kg. Alex crashes into Cameron from behind, and clings on to Cameron to
avoid falling over. They move with a final velocity of 3.0 m/s. If Cameron’s initial velocity
was 2.0 m/s, what was Alex’s initial velocity?
A. 1.3 m/s
B. 2.3 m/s
C. 3.3 m/s
D. 4.3 m/s

Answer 13

D. 4.3 m/s

Question 14

The internal resistance of an ideal ammeter is
A. 0 Ω.
B. 10 Ω.
C. 1 MΩ.
D. Infinite.

Answer 14

A. 0 Ω.

Question 15

Which of the following energy transformations is possible? Burning petroleum to
convert source energy to
A. only kinetic energy.
B. only thermal energy.
C. only kinetic and potential energy.
D. only an electric current.

Answer 15

B. only thermal energy.

Question 16

Water flows through a cylindrical pipe of varying cross-section. The velocity
is 0.33 m/s at a point where the pipe diameter is 3.0 cm. At a point where the pipe
diameter is 1.0 cm, the velocity is:
A. 0.11 m/s
B. 0.33 m/s
C. 1.0 m/s
D. 3.0 m/s

Answer 16

D. 3.0 m/s

Question 17

A baggage cart moves on a level horizontal road at a constant speed of 20 m/s.
The coefficient of friction between its tires and road is 0.95. The smallest turn
radius that the cart can make without slipping is:
A. Cannot be determined without knowledge of the cart’s mass.
B. 2.1 m
C. 36 m
D. 43 m

Answer 17

D. 43 m

Question 18

pirate’s treasure map says to walk 400 m north, then 300 m southwest, then
700 m east-southeast to find buried booty. The pirate could instead travel
(measuring angles to be positive in the clockwise direction from north):
A. 441 m at a heading of 100°
B. 441 m at a heading of 200°
C. 862 m at a heading of 95°
D. 862 m at a heading of 185°

Answer 18

A. 441 m at a heading of 100°

Question 19

If the electric potential difference between points A and B is 30 V, find the work
required to move a 1.0 nC charge from A to B.
A. 1.0 nJ
B. 3.0 nJ
C. 30 nJ
D. 31 nJ

Answer 19

C. 30 nJ

Question 20

A cannonball is shot horizontally from a cliff that is 44 m tall. If the initial speed is
200 m/s, how long does the cannonball stay in the air?
A. 0.21 s
B. 3.0 s
C. 4.5 s
D. 41

Answer 20

B. 3.0 s

Question 21

A 10-kg crowbar of length 1.0 m has an approximately uniform cross-section and
density. A farmer uses the crowbar as a lever. In the configuration shown below,
what is the torque exerted by gravity if 𝜃 = 20°? Use the tip of the pivot as your
choice of reference axis and let the angular coordinate increase in the
anticlockwise direction.
A. +46 N m
B. -46 N m
C. +92 N m
D. -92 N m

Answer 21

B. -46 N m

Question 22

A block of lead of mass 150 g has a volume of 1.3 × 10−5 m3. When entirely
submerged in liquid mercury (density of mercury 𝜌 = 1.36 × 104 kg/m3), the
buoyancy force on the block is:
A. 1.5 N
B. 1.7 N
C. 0.18 N
D. There is no buoyancy force

Answer 22

B. 1.7 N

Question 23

A system has no dissipation, and its potential energy is described by the function
𝑈(𝑥) = 2.0 J
m2 × 𝑥4, where 𝑥 (measured in metres) is the coordinate of a 1.0-kg
particle. If the particle begins with a speed of 1.2 m/s at 𝑥 = 0 m, what is the
furthest distance away from the origin that it can reach?
A. Cannot be determined without knowing which direction it moves.
B. 0.0 m
C. 0.77 m
D. 1.5 m

Answer 23

C. 0.77 m

Question 24

When a rigid body rotates about a fixed axis, all the points in the body have the
same
A. tangential speed.
B. centripetal acceleration.
C. angular speed.
D. tangential acceleration.

Answer 24

C. angular speed.

Question 25

simple pitot tube uses the stagnation pressure to determine the indicated
airspeed. If the stagnation pressure is 1.18400 × 105 Pa, the air density is 𝜌 =
1.29 kg/m3, and the airspeed is 230 m/s, find the ambient pressure. Give your
result as a fraction of 𝑝𝑎𝑡𝑚 = 1.01325 × 105 Pa to three significant digits.
A. 1.54
B. 1.00
C. 0.956
D. 0.832

Answer 25

D. 0.832

Question 26

A 60-watt light bulb carries a current of 0.5 ampere. The total charge passing
through it in one hour is:
A. 3600 C
B. 3000 C
C. 2400 C
D. 1800 C

Answer 26

D. 1800 C

Question 27

A 10-kg crowbar of length 3.0 m has an approximately uniform cross-section and
density. A farmer uses the crowbar as a lever. In the configuration shown below,
what is the torque exerted by gravity if 𝜃 = 20°? Use the tip of the pivot as your
choice of reference axis and let the angular coordinate increase in the
anticlockwise direction.
A. +46 N m
B. -46 N m
C. +92 N m
D. -92 N m

Answer 27

B. -46 N m

Question 28

If a figure skater pulls their arms in during a spin, conservation of angular
momentum implies that their rotational kinetic energy increases. Where did the
extra kinetic energy come from?
A. It was created from nothing.
B. From the skater applying a tangential force to their arms as they are drawn
in.
C. From the skater applying a radial force to their arms as they are drawn in.
D. From the gravitational force applied by the Moon.

Answer 28

C. From the skater applying a radial force to their arms as they are drawn in.

Question 29

A proton (charge +1.60 × 10−19 C) is held a distance of 1.0 mm away from an
unknown charge. When released, the proton accelerates away from the charge
with an initial acceleration of |𝑎⃗ | = 5.05 × 108 m/s2. Given the proton mass is 𝑚 =
1.67 × 10−27 kg, find the unknown charge.
A. −5.9 × 10−19 C
B. +5.9 × 10−19 C
C. −5.9 × 10−16 C
D. +5.9 × 10−16 C

Answer 29

D. +5.9 × 10−16 C

Question 30

A hydraulic press is used to push an aircraft’s flaps into position. If the hydraulic
fluid exerts a pressure of 4.0 × 106 Pa across a cylindrical piston of diameter
8.0 cm, what is the work done on the piston as it moves through a displacement of
0.7 m?
A. 14 MJ
B. 14 kJ
C. 28 kJ
D. 28 MJ

Answer 30

A. 14 MJ