WorksheetsRotation, Angular Momentum & Elasticity
Total questions: 24
Worksheet time: 15mins
An angular speed of 40 revolution per minute is equivalent to
2.61 rad/s
4.19 rad/s
382 rad/s
0.07 rad/s
You and a friend are playing on the merry- go-round. You stand at the outer edge of the merry-go-round and your friend stands halfway between the outer edge and the center. Assume the rotation rate of the merry-go-round is constant. Who has the greatest angular velocity?
You
Same
Your friend
The formula used to find a torque is...
(m)(g)
(F) cos(Ɵ)
(F)(r)( sin θ )
(m)(a)
If a system is in static equilibrium, it must have the following 2 conditions:
∑τ=0
Constant acceleration
∑F=0
Positive forces only
A disc is rotating about its axis. The angular velocity decreases with time. what is the direction of the angular acceleration? (Hint: Deceleration)
Following the direction of rotation.
The same direction of angular velocity.
Opposite direction of angular velocity.
The basic unit for torque is …..
kgms-1
kgms-2
kgm2s-2
kgms-3
What is happening to the ice skater?
Decreased Angular velocity, decreased rotational inertia
Decreased Angular velocity, increased rotational inertia
Increased Angular velocity, increased rotational inertia
Increased Angular velocity, decreased rotational inertia
Which of these items is easier to turn?
Left
Right
Both are just as easy to turn
Find the angular momentum for a 5 kg solid cylinder with a 20 cm radius rotating at 3 rad/s.
3000 kg-m2/sec
0.3 kg-m2/sec
0.6 kg-m2/sec
1.2 kg-m2/sec
CONSERVATION OF ANGULAR MOMENTUM. A playground merry-go-round has a mass of 120 kg and a radius of 1.80 m. If it is rotating with an angular velocity of 3.14 rad/s, What is its angular velocity after a 22.0-kg child gets onto it by grabbing its outer edge? Consider the merry-go-round as a solid cylinder.
3.14 rad/s
2.3 rad/s
2 rad/s
3.65 rad/s
A disc rotates through 20 revolutions in 5 seconds. If the disc starts from rest, what is the final angular velocity?
5 revolutions /s
100 revolutions /s
8 revolutions /s
10 revolutions /s
When a torque acting upon a system is zero. Which of the following will be constant?
Force
Linear impulse
Linear momentum
Angular momentum
What is the dimensional formula for young's modulus?
[M L-1 T-2]
[M0 L T-2]
[M L T-2]
[M L2 T-2]
Which of the following accurately expresses strain dimensionally?
[M0 L1 T0]
[M0 L0 T0]
[M-2 L1 T1]
[M1 L0 T0]
Tensile strain belongs to which of the following options?
Increase in volume / original volume
Decrease in length / original length
Increase in length / original length
None of the above
Young's modulus is defined by;
Tensile strain/Tesnsile stress
Tensile stress x Tensile strain
Tensile stress / Tensile strain
Length / area
A 2m wire extends by 4mm what is the strain?
0.5
2x10-3
2x10-6
0.005
Given the Young's modulus of elasticity below rank the metals according to the magnitude of tensile stress it can hold from highest to lowest.
Aluminum 69 GPa
Brass 125 GPa
Steel 200 GPa
Aluminum, Brass, Steel
Brass, Aluminum, Steel
Steel, Brass, Aluminum
How much force is required to shear off a metal sheet whose thickness is 2mm and width of 40cm? The shear stress is 5 x 107 N/m2.
400 kN
40 kN
4 kN
A balloon 's volume decreases by 1% when its pressure is increased by 80%. So its Bulk modulus is
80 unit
1/80 unit
1 unit
800 unit
