题目内容
（请给出正确答案）
A、If at º 0 and an ¹ 0, then the point moves along a curve with varying speed.
B、If at = constant and an ¹ 0, then the point moves along a curve with uniformly varying speed.
C、If at ¹ 0 and an º 0, then the point moves along a curve with varying speed.
D、If at ¹ 0 and an º 0, then the point moves along a straight line with constant speed.
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更多“Which statement is correct for a moving point？”相关的问题
A、must be a straight line.
B、must be a planar curve.
C、cannot be a spatial curve.
D、could be a spatial curve.
A、at some instant, the accelerations of all points on a line perpendicular to the axis of rotation are not parallel to each other.
B、at some instant, the velocity magnitudes of any two points are proportional to their vertical distances to the axis of rotation.
C、at some instant, the velocities of any two points are parallel to each other.
D、it is impossible that the motion paths of all points are circular arcs.
A、
B、
C、
D、
A、If the rigid body is in translation, then ½vA½=½vB½ must be satisfied.
B、If ½vA½=½vB½ is satisfied, then the rigid body must be in translation.
C、If the rigid body is in translation, then ½vA½=½vB½ must be satisfied and the directions of the two velocities could be different.
D、If the rigid body is in translation, then the directions of vA and vB must be the same but probably |vA|¹|vB|.
A、
B、
C、
D、
A、the absolute velocity is diagonal of the parallelogram formed by the transport velocity and relative velocity.
B、the transport velocity is diagonal of the parallelogram formed by the absolute velocity and relative velocity.
C、the relative velocity is diagonal of the parallelogram formed by the transport velocity and absolute velocity.
D、the algebraic sum of the projections of the absolute velocity, transport velocity and relative velocity on any axis is equal to zero.
A、
B、
C、
D、
A、
B、
C、
D、
A、
B、
C、
D、
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