One watt is
a) equal to one kilogram per second.
b) the power that can be delivered by an average horse.
c) the same as one-foot pound per second.
d) the proper replacement unit for one joule per second.
[Ques. 2] A uniform rod (mass = 2.0 kg, length = 0.60 m) is free to rotate about a frictionless pivot at one end. The rod is released from rest in the horizontal position. What is the magnitude of the angular acceleration of the rod at the instant it is 60 below the horizontal?
a. 15 rad/s2
b. 12 rad/s2
c. 18 rad/s2
d. 29 rad/s2
e. 23 rad/s2
[Ques. 3] Power
a) is work times time.
b) is force divided by time.
c) has the same units of energy.
d) is work divided by time.
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[Ques. 4] Three particles, each of which has a mass of 80 g, are positioned at the vertices of an equilateral triangle with sides of length 60 cm. The particles are connected by rods of negligible mass. What is the moment of inertia of this rigid body about an axis that is parallel to one side of the triangle and passes through the respective midpoints of the other two sides?
a. 0.018 kg/m2
b. 0.020 kg/m2
c. 0.016 kg/m2
d. 0.022 kg/m2
e. 0.032 kg/m2
[Ques. 5] The joule
a)is a unit in the British system
b)can be used as a unit for either work or energy.
c) is a unit of power.
d) can only be used to designate mechanical
kinetic energy.
[Ques. 6] Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the longer sides and is parallel to the shorter sides?
a. 2.7 kg/m2
b. 3.6 kg/m2
c. 3.1 kg/m2
d. 4.1 kg/m2
e. 1.6 kg/m2
[Ques. 7] Energy
a)is the same thing as power.
b)is a vector quantity.
c)is measured in the same units as work.
d)has the same units of velocity.
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[Ques. 8] Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.5 m 4.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the mid-points of the shorter sides and is parallel to the longer sides?
a. 2.2 kg/m2
b. 2.8 kg/m2
c. 2.5 kg/m2
d. 3.1 kg/m2
e. 1.6 kg/m2
[Ques. 9] Work
a)can be measured in watts.
b)has the units of force x time.
c)is a vector quantity.
d)has the units of N-m.
[Ques. 10] Four identical particles (mass of each = 0.24 kg) are placed at the vertices of a rectangle (2.0 m 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the moment of inertia of this rigid body about an axis that passes through the center of mass of the body and is parallel to the shorter sides of the rectangle?
a. 2.4 kg/m2
b. 2.2 kg/m2
c. 1.9 kg/m2
d. 2.7 kg/m2
e. 8.6 kg/m2
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