**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 × 10*

**8**N/m**2**. 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*

**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*

**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*