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REE(Objectives) > Engineering Mechanics 251-291 > Flashcards

Engineering Mechanics 251-291 Flashcards

1
Q
  1. The term _____ is used when rotating to the center of gravtiy of a weightless figure such as a line, an area or a vloume.
A

Centroid

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2
Q

252.The moment of inertia is sometimes called the

A

second moment of area

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3
Q
  1. The term _______ is used to describe another mathematical expression appears and appears must frequently in colummn formulas.
A

Radius gyration

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4
Q
  1. The moment of inertia of an area is defined by the equation?
A

Sp^2dA

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5
Q
  1. The pendulum clock was developed by
A

Huygens

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6
Q
  1. It the geometry of motion.
A

Kinematics

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7
Q
  1. It is the branch of mechanics that relates the force acting on a body to its mass and acceleration.
A

Dynamics

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8
Q
  1. The ______ expresses the relation between the external forces applied to a system of particles and the effective force on each particle of the system.
A

D’alemberts principle

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9
Q
  1. It is defined as the motion of a rigid body in which a straight live passing through any point of the body always remain parallel to its initial position.
A

Translation

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10
Q
  1. The motion of translating body moving in a straight line is called
A

Rectilinear translation

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11
Q
  1. If the path of the translating body is curved, the motion becomes
A

Curve linear translation

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12
Q

262.The area under a v-t curve represents the change in

A

displacement

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13
Q
  1. The area under an a-t curve represents the change in
A

Acceleration

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14
Q
  1. When the principle of the motion of the center of gravity is
A

applied to rectilinear translation we obtain

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15
Q

265.The normal component of acceleration is expressed by

A

an= v^2/r

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16
Q
  1. It is defined as that motion of rigid body in which the particles move in a circular paths with their center on a fixed straight line.
A

Rotation

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17
Q
  1. ___________ is measured in radians by the angular distance swept through by any radians of or line in the rotatin body
A

angular displacement

18
Q
  1. It is defined as the motion of rigid body in which all particles in the body remain at a constant distance from a fixed reference plane.
A

Plane motion

19
Q
  1. The expression (w/2g)v^2 is defined as
A

Resultant work

20
Q
  1. The epxression S^-8osumationX ds is defined as
A

Resultant work

21
Q
  1. It is a motion which repaets itself after a define internal of time
A

vibration

22
Q
  1. The maximum displacement of the body from its equilibrium position is known as the ______ of the vibration.
A

Amplitude

23
Q
  1. Each repetition of the motion is called a
A

cycle

24
Q
  1. The _________ of the vibration is the reciprocal of the period and is measured in cycles per second.
A

frequency

25
Q
  1. The time required to complete one oscillation backward and forward is calledd the _____ of the motion.
A

Period

26
Q
  1. The condition existing when the impressed frequency is equal to the natural frequency is known as
A

resonance

27
Q
  1. The speed of rotation at which resonance occurs is called.
A

critical speed

28
Q
  1. The a = w^2s is the mathematical description for
A

Simple harmonic motion

29
Q
  1. ________ is the rate at which work is done on a body.
A

Power

30
Q
  1. The _______ is a traditional unit equivalent to 550 ft-lb of work per sec. or 33,000 ft-lb of work per min.
A

Horse power

31
Q
  1. It is the ratio of power output to power input
A

Efficiency

32
Q
  1. It is defined as that which changes, or tends to change, the state of motion of a body.
A

Force

33
Q
  1. An axis passing through the centroid of an area is known as a
A

centroidal axis

34
Q
  1. It is defined as the time rate of change of displacement.
A

Velocity

35
Q
  1. It is defined as the time rate of change of velocity
A

Acceleration

36
Q
  1. The ___________ is a force that results from the attraction between the mass of the body and the mass of the earth.
A

density

37
Q
  1. The line joining the center of gravity and thecenter of rotation will be called
A

N axis

38
Q
  1. The line through the center of rotaiton perpendicular to N will be called
A

T axis

39
Q
  1. The axis of rotation will be called the
A

Z axis

40
Q
  1. The _________ are called the normal and tangential axes since they are respectively normal and tangent ot hte path of the center of gravity.
A

Rotatin axes

41
Q
  1. A ______ is defined as particle at the end of weightless cord where is allowed to vibrate in a vertical arc of a circle under the influence of gravity and the tension in the cord.
A

REE(Objectives) (8 decks)

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