Test8A (1)

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TEST 8 - WERSJA ANGIELSKA
8.1A In simple harmonic motion, the restoring force must be proportional to the:
A)
amplitude
D)
displacement
B)
frequency
E)
displacement squared
C)
velocity
8.2A In simple harmonic motion, the magnitude of the acceleration is:
A)
constant
B)
proportional to the displacement
C)
inversely proportional to the displacement
D)
greatest when the velocity is greatest
E)
never greater than
g
8.3A An object is undergoing simple harmonic motion. Throughout a complete cycle it:
A)
has constant speed
D)
has varying acceleration
B)
has varying amplitude
E)
has varying mass
C)
has varying period
8.4A A
0.20-kg
object mass attached to a spring whose spring constant is
500 N/m
executes
simple harmonic motion. If its maximum speed is
5.0 m/s,
the amplitude of its
oscillation is:
A) 0.0020 m B) 0.10 m C) 0.20 m D) 25 m E) 250 m
8.5A Three physical pendulums, with masses
m
1
, m
2
= 2m
1
, and
m
3
= 3m
1
, have the same
shape and size and are suspended at the same point. Rank them according to their
periods, from shortest to longest.
A) 1, 2, 3 B) 3, 2, 1 C) 2, 3, 1 D) 2, 1, 3 E) All the above are the same
8.6A Five hoops are each pivoted at a point on the rim and allowed to swing as physical
pendulums. The masses and radii are
hoop 1:
M = 150g
and
R = 50 cm
hoop 2:
M = 200g
and
R = 40 cm
hoop 3:
M = 250g
and
R = 30 cm
hoop 4:
M = 300g
and
R = 20 cm
hoop 5:
M = 350g
and
R = 10 cm
Order the hoops according to the periods of their motions, smallest to largest.
A)
1, 2, 3, 4, 5
D)
1, 2, 5, 4, 3
B)
5, 4, 3, 2, 1
E)
5, 4, 1, 2, 3
C)
1, 2, 3, 5, 4
8.7A The rotational inertia of a uniform thin rod about its end is
ML
2
/3, where
M
is the mass
and
L
is the length. Such a rod is hung vertically from one end and set into small
amplitude oscillation. If
L
= 1.0 m this rod will have the same period as a simple
pendulum of length:
A) 33 cm B) 50 cm C) 67 cm D) 100 cm E) 150 cm
8.8A Five particles undergo damped harmonic motion. Values for the spring constant
k
, the
damping constant
b
, and the mass
m
are given below. Which leads to the smallest rate of
loss of mechanical energy?
A)
k
= 100N/m,
m
= 50g,
b
= 8g/s
D)
k
= 200N/m,
m
= 8g,
b
= 6g/s
B)
k
= 150N/m,
m
= 50g,
b
= 5g/s
E)
k
= 100N/m,
m
= 2g,
b
= 4g/s
C)
k
= 150N/m,
m
= 10g,
b
= 8g/s
8.9A A sinusoidal force with a given amplitude is applied to an oscillator. To maintain the
largest amplitude oscillation the frequency of the applied force should be:
A)
half the natural frequency of the oscillator
B)
the same as the natural frequency of the oscillator
C)
twice the natural frequency of the oscillator
D)
unrelated to the natural frequency of the oscillator
E)
determined from the maximum speed desired
8.10A A sinusoidal force with a given amplitude is applied to an oscillator. At resonance the
amplitude of the oscillation is limited by:
A)
the damping force
D)
the force of gravity
B)
the initial amplitude
E)
none of the above
C)
the initial velocity
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