大学MOOC Physics孟广伊(沈阳工程学院)1450830182 最新慕课完整章节测试答案
1-2MotioninaCircle
Chapter1Test
1、单选题：
Which of the following formulas is true for all types of motion?
选项：
A: 
B: 
C: 
D: 
答案: 【 】
2、单选题：
Which of the following ideas is helpful in understanding projectile motion?
选项：
A: Acceleration is +g when the object is rising and -g when falling.
B: The horizontal motion is independent of the vertical motion.
C: The velocity of the object is zero at the top point of parabola.
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.】
3、单选题：
If the motional equation of a particle is expressed as 
, which of the following statement is true?
选项：
A: It is a uniform circular motion.
B: The path is a parabola.
C: The radial acceleration is 
D: The speed is v=2t.
答案: 【 The speed is v=2t.】
4、单选题：
选项：
A: 
B: 
C: 
D: 
答案: 【 】
5、判断题：
If we choose two different reference frames to analyze the motion of an object, the description of motion can be different.
选项：
A: 正确
B: 错误
答案: 【 正确】
6、判断题：
In 1-dimentional motion, if we know the acceleration 
of an object, then its velocity can be expressed as: 
选项：
A: 正确
B: 错误
答案: 【 错误】
7、判断题：
If a particle has a constant speed, its acceleration equals 0.
选项：
A: 正确
B: 错误
答案: 【 错误】
8、判断题：
In a circular motion, the acceleration is always perpendicular to the velocity.
选项：
A: 正确
B: 错误
答案: 【 错误】
9、填空题：
答案: 【 140】
10、填空题：
The acceleration of a particle is given by a=6t(SI). At t=0, v=10m/s and x=0. Where is the particle at t=5s? x= m
答案: 【 175】
11、填空题：
An object moving in r =100m circle satisfies: 
, how much is the magnitude of acceleration when t=1s? 
答案: 【 15】
12、填空题：
Someone must get directly across a 160m wide river (from A to B) in the minimum time. The river's current is 0.8m/s, he can row a boat at 1.6m/s, and he can run 3m/s. Try to find the best path he can take, and what is the minimum time for the crossing? t = ________ s
答案: 【 [114,128]】