A: Vertical component of projectile motion
B: Circular motion at constant speed
C: A swinging pendulum
D: Earth’s motion about sun
E: Horizontal component of projectile motion
举一反三
- The forms of fluid motion in impeller include A: Circular motion B: Relative motion C: Vertical motion D: Absolute motion
- Which of the following motions will cause flexible impulse in a cam mechanism? A: Constant velocity motion B: Constant acceleration motion C: Harmonic motion D: Cycloidal motion
- Which of the following motions exhibit no impulse in a cam mechanism? A: Constant acceleration motion B: Harmonic motion C: Cycloidal motion D: 3-4-5 orders polynomial motion
- An example of this is motion parallel to the earth’s surface.
- For a point on a spinning disc in uniform circular motion, which of the following is not constant? A: It's angular speed B: It's angular acceleration C: It's centripetal acceleration D: The magnitude of it's total acceleration E: None of the others
内容
- 0
Which of the following is not necessary for motion analysis? A: Justifying the feasibility of the plan. B: Defining key terms. C: Determining the motion type. D: Analyzing the context of the motion
- 1
The reason _______ nothing on earth is motionless is_______ the earth is in constant motion(运动).
- 2
A<br/>beam of electrons enters a magnetic field. Which of the following<br/>best describes their motion? A: They<br/>continue in a straight line. B: They<br/>are bent toward Magnetic North. C: They<br/>exhibit circular motion in the counterclockwise direction. D: They<br/>exhibit circular motion in the clockwise direction. E: Not<br/>enough information is given.
- 3
Angular motion about the vertical axis of a vessel is called_____
- 4
A body in motion remains in motion at a constant speed in a straight line unless acted upon by an external force. 运用分句法的译文为 .