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Mechanical Engineering
Rotational Inertia
Quiz 2
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Q.1
The object with more rotational inertia needs more torque to move than object with lower inertia?
True
False
Q.2
What is the angular acceleration of an object that has rotational inertia of 4 kg.m2 and submitted to a torque of 8 N.m?
0.5 rad/s2
2 rad/s2
4 rad/s2
8 rad/s2
Q.3
If the same torque is applied on a hoop (I=MRand a solid disk (I=1/2MR2), afterwhich object will be moving faster?
Hoop
Solid Disk
Q.4
The value of torque depends on the rotation axis and the _______________________
magnitude of applied force.
mass of object
moment inertia of object
shape of object
Q.5
Torque can be positive or negative.
True
False
Q.6
From the rotational microwave spectrum of 1H35Cl, we find that B = 10.cm-1 . Given that the masses ofandCl are 1.and 34.amu, respectively, determine the bond length of the 1H35Cl molecule
1.274 x 10-10 m
1.674 x 10-10 m
1.474 x 10-10 m
1.0274 x 10-10 m
Q.7
__________ (ω)– the rate at which a body rotates about an axis (radians per second)
linear speed
rotational speed
angular speed
velocity
Q.8
The microwave active molecules are
HCl, OCS
CO,CO2
Both a) and b)
None of the above
Q.9
Conditions for equilibrium are:1st condition: net force = 02nd condition:net torque = 0
True
False
Q.10
Which of the following molecule has no rotational spectrum?
NH3
HCl
N2
H2O.
Q.11
Calculate the moment of inertia, I, of the molecule 1H35Cl. The masses of the two atoms are mH = 1.xkg and mCl = 5.xkg. The equilibrium bond length of the molecule is 1.Å.
2.644 x 1047 kg m2
2.644 x 1027 kg m2
2.644 x 1044 kg m2
2.644 x 1024 kg m2
Q.12
The photon described in Question 3 lies within which part of the electromagnetic spectrum?
Radio wave
Visible
Infrared
Ultraviolet
Q.13
The energy in joules of a photon of wavelengthnm is
5.596 x 1019 J
5.596 x 1028 J
Q.14
A photon of wave numbercm-1 has a wavelength of
1 m
1 mm
1000 nm
100 m
Q.15
The different types of energies associated with a molecule are __________
Vibrational energy
electronic energy
Rotational energy
All of these
Q.16
Moment of inertia depends on
Distribution of particles
Mass
Position of axis of rotation
All of these
Q.17
A body of M.I. 3 kg m² rotating with an angular velocity 2 rad/s has the same K.E. as a mass ofkg moving with a velocity of
1 m/s
2 m/s
4 m/s
8 m/s
Q.18
The product of the force times the lever arm; the movement of the force about the axis is:
torque
lever arm
rotational inertia
angular momentum
Q.19
The dimensions of angular momentum are
[M1 L2 T-1]
[M1 L1 T-1]
[M1 L1 T-2]
[M1 L2 T-2]
Q.20
The M.I. of a body does not depends upon
Angular velocity of a body
Axis of rotation of the body
The mass of the body
The distribution of the body
0 h : 0 m : 1 s
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