2022 大学物理I(电子科技大学)1467134652 最新满分章节测试答案

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本课程起止时间为:2022-02-22到2022-07-01

Chapter 3 Kinematics in More Dimensions; Vectors (2) Chapter 2~3 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:
选项：
A:
B:
C:
D:
答案: 【】

4、 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.】

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 accelaration  of an object, then its velocity can be expressed as: 
选项：
A:正确
B:错误
答案: 【错误】

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】

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】

9、 问题:
答案: 【140】

10、 问题:
答案: 【[79.6,80.1]】

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 1.5m/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: 【[123,125]】

Chapter 4 & 5 Dynamics： Newton’s Laws and Application (2) Chapter 4&5 Test

1、 问题:A conical pendulum composed of a massless rope (length L) and a bob (mass m) is shown in Figure. How much is the period for the pendulum? 
选项：
A:
B:
C:
D:
答案: 【】

2、 问题:A mass m slides down along a circular track (radius R) from position A with no friction. When it arrives the position as figure, how much is the normal force N acted by the track?
选项：
A:
B:
C:
D:
答案: 【】

3、 问题:A person stands on a bathroom scale in an elevator. When the scale reads only 75% of the person’s regular weight, he claims that the elevator must be moving downward. Is he right?
选项：
A:正确
B:错误
答案: 【错误】

4、 问题:Newton’s laws can be used in any reference frame.
选项：
A:正确
B:错误
答案: 【错误】

5、 问题:A small block of mass m is released on a triangular block of mass M. If at the same time a force  is applied to M, m remains rest relative to M. (Assuming all surfaces are frictionless)
选项：
A:正确
B:错误
答案: 【正确】

6、 问题:Newton’s second law says: the acceleration of an object is directly proportional to the net force acting on it and is inversely proportional to its __. (one word)
答案: 【mass】

7、 问题:
答案: 【[7.2,7.4]】

8、 问题:A 1500-kg car moving at 20m/s crosses the rounded top of a hill (treat as an arc of circle, radius 100m). What is the normal force N acted by the hill? (g=9.80m/s^2)N = ___ N
答案: 【8700】

Chapter 9 Linear Momentum and Collisions (3) Chapter 7~9 Test

1、 问题:A particle is suspended from a post on top of a cart by a light string as shown in Figure. The cart and particle are initially moving to the right at constant speed v, with the string vertical. The cart suddenly comes to rest when it runs into and sticks to a bumper. Which of the following statements is true about the collision process?
选项：
A:The linear momentum of the cart is conserved.
B:The linear momentum of the particle is conserved.
C:The linear momentum of the cart and linear momentum of the particle are both conserved.
D:The linear momentum of the cart and linear momentum of the particle are both not conserved.
答案: 【The linear momentum of the particle is conserved.】

2、 问题:A uniform thin equilateral triangle with the length of each edge is a. The position of CM (center of mass) is
选项：
A:
B:
C:
D:
答案: 【】

3、 问题:A certain spring that obeys Hooke’s law is stretched by an external agent. The work done in stretching the spring by 10cm is 4J. How much additional work is required to stretch the spring an additional 10cm? 
选项：
A:4J
B:8J
C:12J
D:16J
答案: 【12J】

4、 问题:A skier of mass m slides from rest at the top of a frictionless solid sphere of radius R. Then at what angle θ will he leave the sphere?
选项：
A:
B:
C:
D:
答案: 【】

5、 问题:Consider a 2-Dimensional elastic collision between two identical balls, with one being a target initially at rest. What is the angle between their final velocity vectors?
选项：
A:0°
B:90°
C:180°
D:Any angle is possible.
答案: 【90°】

6、 问题:The kinetic energy of an object depends on the reference frame in which its motion is measured.
选项：
A:正确
B:错误
答案: 【正确】

7、 问题:A force acting on an object does no work on it, if the force is always perpendicular to the moving direction of object.
选项：
A:正确
B:错误
答案: 【正确】

8、 问题:Only nonconservative forces can change the kinetic energy of an object.