Final Exam

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#1 How many balls are used in billiards?
15
5
3
10

#2 When was the game pool or billiards originate?
12th century
17th century
Not exactly known
Really, really long time ago

#3 Which of the following does NOT result in a loss of game?
Pockets the 8-ball on the same stroke as the last of his group of balls
Pockets the 8-ball when it is not the legal object ball
Jumps the 8-ball off the table at any time
Before pocketing the 8-ball, it has only hit 2 rails

#4 What angle do two balls in angular colisions form? (one is stationary before collision)
obtuse
acute
right
60 degrees

#5 What are the rectangular coordinates to (1, p, p/2)
(3, 2, 1)
(0, 0, -1)
I don't know
Invalid location

#6 The cross product of <3, 2, 1> and <1, 2, 3> is?
<3, 4, 5>
<1, 2, 3>
<4, -8, 4>
umm... 2

#7 How can you lift a penny, if Newton's 2nd Law is true? (Newton's 2nd Law - For every force, there MUST also be an equal and opposite force)
Acceleration is caused by net external forces, hence only the forces exerted by other objects affect movent.
Pennies are so light
Why should I care? It's only a penny.
I heard that pennies can kill people if I dropped it from the Empire State building in New York.

#8 I'd rather get hit by...
A school bus moving at 10 mph
An ant moving at the speed of light
A racing car moving at 250 mph
A pebble moving at the speed of sound

#9 Which of the following produces the greatest kinetic energy after 5lbs of force has been applied?
An object on ice
An object on carpet
An object rolling on ice
An object rolling on carpet

#10 An impulse is?
The rate of change of force respect to time
The total force respect to time
The rate of change of momentum respect to time
The total momentum respect to time

#11 The condition for conservation of linear momentum is?
Zero deceleration
Zero net external force
Zero friction
Conservation of energy

#12 If a rotating skater wishes to increase her angular velocity, she should
Fold her arms in
Wear tighter clothes to decrease air resistance
Eat more and get stronger
Make herself lower to the ice

#13 Maximum torque is produced when hitting the ball on the
edge
center
midway between the center and the edge
lower half

#14 In rotations, the friction coefficient that is involved is?
Rotating
Stationary
Kinetic
Potential

#15 dL/dt = ?
torque
force
linear momentum
kinetic energy

#16 What is the radius of curvature in non-slipping and rolling balls?
r cosq
r cosf
r sinq
r sinf

#17 In pool, the thermodynamic energy is produced by
Translation
Rotation
Impulse
Collisions

#18 What causes a rotating ball to stop?
Air resistance
Stationary friction
Kinetic friction
Never stops

#19 Tangential acceleration of an object is?
Rw
Ra
w
a

#20 By how many more degrees does a cue ball reflect when w > 0?
arctan (Rw/v)
arctan (v/wR)
arcsin (v/wR)
arcsin (Rw/v)

Solutions