2021答案 Physics（大学物理）最新满分章节测试答案

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Chapter 32 Special Theory of Relativity (3) Midterm Test

Chapter 32 Special Theory of Relativity (3) Midterm Test

1、问题:Which of the following ideas is helpful in understanding projectile motion?
选项：
A:The horizontal motion is independent of the vertical motion.
B:The velocity of the objects is zero at the point of maximum elevation.
C:Acceleration is +g when the object is rising and -g when falling.
D:In the absence of friction, the trajectory will depend on the object’s mass as well as its initial velocity and launch angle.
答案: 【The horizontal motion is independent of the vertical motion.】

2、问题: In Fig. 1, as the ball shown rolls down the hill,
选项：
A:both its speed and its acceleration increase.
B:its speed increase and its acceleration decrease.
C:both speed and acceleration decrease.
D:its speed decreases and its acceleration increase.
答案: 【its speed increase and its acceleration decrease.】

3、问题:A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case.Case A: Thrown straight down;Case B: Thrown out at an angle of 45 degrees above horizontal;Case C: Thrown straight out horizontally.In which case will the speed of the stone be greatest when it hits the water below?
选项：
A:Case A
B:Case B
C:Case C
D:The speed will be the same in all cases.
答案: 【The speed will be the same in all cases.】

4、问题:
选项：
A:
B:
C:
D:
答案: 【】

5、问题:A particle of mass m is exerted with a force. Which of the following force is NOT conserved? Where b, g, k, C, D are constants, and v is the speed of the particle.
选项：
A:
B:
C:
D:
答案: 【】