大学MOOC University Physics I(东南大学)1463190167 最新慕课完整章节测试答案
Chapter 1Kinematics
Quiz 1
1、单选题：
A particle is moving in the xy-plane, and its coordinates, as functions of time t, are given by 
where a, b and c are positive constants. When the particle’s velocity makes an angle of 45 degrees with the +x-axis, its speed is given by
选项：
A: 
B: 
C: 
D: 
答案: 【 】
2、单选题：
The velocity of a particle moving along the x-axis is given by
where t is in seconds and 
is in meters per second. At 
, the particle is located at 
. The particle’s equation of motion is
选项：
A: 
B: 
C: 
D: 
答案: 【 】
3、单选题：
A particles rotates with a constant angular acceleration 
in a circular path of radius R from rest. After the position vector of the particle sweeps out an angle 
, the particle’s acceleration makes an angle of 45 degrees with the particle’s velocity. In radians, the angle is given by
选项：
A: 1/6
B: 1/4
C: 1/3
D: 1/2
答案: 【 1/2】
4、单选题：
A projectile is launched into the air with a speed 
at an angle 
with the horizontal direction at 
. What are the projectile’s normal acceleration at and the radius of curvature of its trajectory at the highest point?
选项：
A: 
B: 
C: