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circle most appropiate choice 1a. Which of the following forces is NOT a conservative force? a. friction force b....

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Mechanical Engineering

circle most appropiate choice

1a. Which of the following forces is NOT a conservativeforce?

a. friction force

b. spring force

c. gravitational force

d. none of the above

1b. In which circumstance is the force of frictionbetween two surfaces at its maximum magnitude?

(Note: subscripts s and k specify the static and dynamicconditions, respectively.)

a. When friction angle satises (Φ < Φs)

b. When friction angle satises (Φ = Φs)

c. When friction angle satises (Φ = Φk)

d. None of the above

1c. Which of the following labels is WRONG?

a. 10e-6 : micro

b. 10e-9 : nano

c. 10e-12 : atto

d. 10e-15 : femto

1d. In curvilinear kinematics, when using the normal andtangential components to express the particle acceleration, thenormal acceleration is always _________________.

a. positive

b. negative

c. pointing toward the center of curvature

d. choices a and c

1e. Which one of the following equations are WRONG withrespect to cartesian unit vectors i, j, k, along x, y, and z axes,respectively? (Note: (X) indicates the cross product of twovectors)

a. i X j = k

b. k X j = -i

c. k X i = -j

d. j X j = 0

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