2020 Physics孟广伊(沈阳工程学院) 最新满分章节测试答案

文章目录[隐藏]

1-2 Motion in a Circle Chapter1 Test
Chapter 11 General Rotation (2) Chapter 10~11 Test
Chapter 11 General Rotation (2) Chapter 10~11 Test（2）
Chapter 11 General Rotation (2) Chapter 5~6 Test
Chapter 11 General Rotation (2) Chapter 7 Test

本答案对应课程为:点我自动跳转查看
本课程起止时间为:2020-02-24到2020-06-30
本篇答案更新状态:已完结

1-2 Motion in a Circle Chapter1 Test

1、问题:Which of the following formulas is true for all types of motion?
选项：
A:
B:
C:
D:
答案: 【】

2、问题: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、问题: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、问题:
选项：
A:
B:
C:
D:
答案: 【】

5、问题: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、问题: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】
分析：【The acceleration is not necessary to be constant, so we have to use an integral to express velocity.】

7、问题:If a particle has a constant speed, its acceleration equals 0.
选项：
A:正确
B:错误
答案: 【错误】
分析：【If a particle has a constant speed, its tangential acceleration equals 0.】

8、问题:In a circular motion, the acceleration is always perpendicular to the velocity.
选项：
A:正确
B:错误
答案: 【错误】
分析：【Only valid when it is a uniform circular motion.】

9、问题:
答案: 【140】

10、问题: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、问题:An object moving in r =100m circle satisfies: , how much is the magnitude of acceleration when t=1s?
答案: 【15】

12、问题: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]】

Chapter 11 General Rotation (2) Chapter 10~11 Test

1、问题:Consider an object on a rotating disk a distance r from its center, held in place on the disk by static friction. Which of the following statements is NOT true concerning this object?
选项：
A:If the angular speed is constant, the object has a zero acceleration.
B:The object has a tangential acceleration only if the disk has an angular acceleration.
C:The object always has a centripetal acceleration except when the angular speed is zero.
D:If the angular speed is constant, the speed of object is also constant.
答案: 【If the angular speed is constant, the object has a zero acceleration. 】

2、问题:Consider the orbital motion of a planet going around the Sun. Which of the following statements about the motion is true?
选项：
A:Only the mechanical energy of planet is conserved.
B:Only the angular momentum of planet is conserved.
C:Both the angular momentum and mechanical energy of planet are conserved.
D:Neithor of the angular momentum or mechanical energy of planet is conserved.
答案: 【Both the angular momentum and mechanical energy of planet are conserved.】

3、问题:A bullet hits into a hanged uniform rod, the total momentum and total angular momentum of the system are both conserved after collision. Where does the bullet hit?
选项：
A:r = l /3
B:r = l /2
C:r = 2l /3
D:r = 3l /4
答案: 【r = 2l /3】

4、问题:Consider 3 objects with the same mass m but different shapes (solid cylinder, solid sphere and cylindrical shell). They all roll down from rest on an incline without slipping, which one rolls fastest?
选项：
A:The solid cylinder.
B:The solid sphere.
C:The cylindrical shell.
D:They roll equally fast.
答案: 【The solid sphere.】

5、问题:When you watch a clock hanging on a vertical wall, the direction of angular velocity of the second hand is perpendicular to the wall and pointing outside.
选项：
A:正确
B:错误
答案: 【错误】

6、问题:If we measure the rotational inertia of an object about different axes, we may obtain different values.
选项：
A:正确
B:错误
答案: 【正确】

7、问题:The angular momentum of a particle remains constant if there is no net torque acting on it.
选项：
A:正确
B:错误
答案: 【正确】

8、问题:Centrifugal force can be measured in noninertial frames, but it is not a real force, there is no object applying this force.
选项：
A:正确
B:错误
答案: 【正确】

9、问题:A box is hanging on a pulley by massless rope, then the system starts to move without slip, How much is the acceleration of m?
答案: 【[6.5,6.7]】

10、问题:
答案: 【2】

Chapter 11 General Rotation (2) Chapter 10~11 Test（2）

1、问题:Consider the orbital motion of a planet going around the Sun. Which of the following statements about the motion is true?
选项：
A:Only the mechanical energy of planet is conserved.
B:Only the angular momentum of planet is conserved.
C:Both the angular momentum and mechanical energy of planet are conserved.
D:Neithor of the angular momentum or mechanical energy of planet is conserved.
答案: 【Both the angular momentum and mechanical energy of planet are conserved.】