Question No: 1 ( M - 1 ) . The lowest tone produced by a certain organ comes from a 3.0-m pipe with both ends open. If the speed of sound is 340m/s, the frequency of this tone is approximately:
► A. 7Hz
► B. 14 Hz
► C. 28 Hz
► D. 57 Hz
Question No: 2 ( M - 1 ) . To raise the pitch of a certain piano string, the piano tuner:
► A. loosens the string
► B. tightens the string
► C. shortens the string
► D. lengthens the string
Question No: 3 ( M - 1 ) . A force of 5000N is applied outwardly to each end of a 5.0-m long rod with a radius of 34.0 cm and a Young's modulus of 125 × 108N/m2. The elongation of the rod is:
► 0.0020mm
► 0.0040mm
► 0.14mm
► 0.55mm
Question No: 4 ( M - 1 ) . A particle oscillating in simple harmonic motion is:
► never in equilibrium because it is in motion
► never in equilibrium because there is always a force
► in equilibrium at the ends of its path because its velocity is zero there
► in equilibrium at the center of its path because the acceleration is zero there
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Question No: 5 ( M - 1 ) - Please choose vuzs one
In simple harmonic motion, the restoring force must be proportional to the:
► amplitude
► frequency
► velocity
► displacement
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Question No: 6 ( M - 1 ) . A 160-N child sits on a light swing and is pulled back and held with a horizontal force of 100 N. The magnitude of the tension force of each of the two supporting ropes is:
► 60N
► 94N
► 120N
► 190N
Question No: 7 ( M - 1 ) - Please choosevu zsone
An object attached to one end of a spring makes 20 vibrations in 10 s. Its angular frequency is:
► 12.6 rad/s
► 1.57 rad/s
► 2.0 rad/s
► 6.3 rad/s
Question No: 8 ( M - 1 ) . For an object in equilibrium the net torque acting on it vanishes only if each torque is calculated about:
► the center of mass
► the center of gravity
► the geometrical center
► the same point
Question No: 9 ( M - 1 ) . Ten seconds after an electric fan is turned on, the fan rotates at 300 rev/min. Its average angular acceleration is:
► 3.14 rad/s2
► 30 rad/s2
► 30 rev/s2
► 50 rev/min2
► 1800 rev/s2
Question No: 10 ( M - 1 ) . A 4.0-N puck is traveling at 3.0m/s. It strikes a 8.0-N puck, which is stationary. The two pucks stick together. Their common final speed is:
► 1.0m/s
► 1.5m/s
► 2.0m/s
► 2.3m/s
Question No: 11 ( M - 1 )
An object moving in a circle at constant speed:
► must have only one force acting on it
► is not accelerating
► is held to its path by centrifugal force
► has an acceleration of constant magnitude
Question No: 12 ( M - 1 ) . A plane traveling north at 200m/s turns and then travels south at 200m/s. The change in its velocity is:
► 400m/s north
► 400m/s south
► zero
► 200m/s south
Question No: 13 ( M - 1 ) . At time t = 0 a car has a velocity of 16 m/s. It slows down with an acceleration given by −0.50t, in m/s2 for t in seconds. It stops at t =
► 64 s
► 32 s
► 16 s
► 8.0 s
Question No: 14 ( M - 1 )
1 mi is equivalent to 1609 m so 55 mph is:
► 15 m/s
► 25 m/s
► 66 m/s
► 88 m/s
