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The professor briefly describes developments in home building. Put the developments in the
A.Round structure built of stone
B.Building with multiple living units
C.Round hut made of branches and leaves
D.Box-shaped structure with four walls
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A.Round structure built of stone
B.Building with multiple living units
C.Round hut made of branches and leaves
D.Box-shaped structure with four walls
The planar motion of a rigid body can be resolved into a translation and a rotation. The angular velocity and angular acceleration with respect to base pointare
and
, respectively. The angular velocity and angular acceleration with respect to base point
are
and
, respectively. Which set of the following equations is correct?
A、
B、
C、
D、
A、
B、
C、
D、
At a instant, the magnitudes of velocities of pointsand
in a plane figure are
and
, respectively, and
. Which drawings are impossible for the velocity directions?
A、
B、
C、
D、
Pointsand
are any two arbitrary points in a plane figure. At a instant, the velocities of these two points are
and
, respectively; The accelerations of these two points are
and
, respectively. Which of the following equations is correct?
A、
B、
C、
D、
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