A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at the horizontal position. What is the angular acceleration of the rod at the instant the rod makes an angle of 70 with the horizontal?
a. 3.7 rad/s2
b. 1.3 rad/s2
c. 2.5 rad/s2
d. 4.9 rad/s2
e. 1.9 rad/s2
[Ques. 2] Zero degrees on the Celsius scale
corresponds to what reference point?
a)the ice point
b)the steam point
c)absolute zero
d)212 degrees Fahrenheit
[Ques. 3] A change of 100o on the Celsius scale is
equal to a change of how many degrees on
the Fahrenheit scale?
a)212
b)120
c)100
d)180
[Ques. 4] A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 30 above the horizontal. What is the angular acceleration of the rod at the instant it is released?
a. 4.7 rad/s2
b. 6.9 rad/s2
c. 6.4 rad/s2
d. 5.6 rad/s2
e. 4.2 rad/s2
[Ques. 5] A wheel (radius = 12 cm) is mounted on a frictionless, horizontal axle that is perpendicular to the wheel and passes through the center of mass of the wheel. A light cord wrapped around the wheel supports a 0.40-kg object. If released from rest with the string taut, the object is observed to fall with a downward acceleration of 3.0 m/s2 . What is the moment of inertia (of the wheel) about the given axle?
a. 0.023 kg/m2
b. 0.013 kg/m2
c. 0.020 kg/m2
d. 0.016 kg/m2
e. 0.035 kg/m2
[Ques. 6] A mass of 3 kg is moving with a velocity of 0.25 m/s. An unbalanced force is applied and increases the velocity to 0.45 m/s. The work done by the unbalanced force is
a) 0.34 J
b) 0.84 J
c) 0.21 J
d) 1.2 J
[Ques. 7] Particles (mass of each = 0.40 kg) are placed at the 60-cm and 100-cm marks of a meter stick of negligible mass. This rigid body is free to rotate about a frictionless pivot at the 0-cm end. The body is released from rest in the horizontal position. What is the magnitude of the initial linear acceleration of the end of the body opposite the pivot?
a. 15 m/s2
b. 9.8 m/s2
c. 5.8 m/s2
d. 12 m/s2
e. 4.7 m/s2
[Ques. 8] Any massive object that is moving will
always have
a) An unbalanced force acting on it.
b) kinetic energy.
c) angular momentum.
d) potential energy.
[Ques. 9] One horsepower is the same as
a) 550 foot-pounds/second.
b) 746 watts.
c) 746 newton-meters/second.
d) all of the above.
[Ques. 10] Particles (mass of each = 0.20 kg) are placed at the 40-cm and 100-cm marks of a meter stick of negligible mass. This rigid body is free to rotate about a frictionless pivot at the 0-cm end. The body is released from rest in the horizontal position. What is the initial angular acceleration of the body?
a. 12 rad/s2
b. 5.9 rad/s2
c. 8.4 rad/s2
d. 5.4 rad/s2
e. 17 rad/s2
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