20春-General Physics-须萍-1(苏州大学)mooc慕课答案2026年版满分测试WYC

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起止时间:2020-02-23到2020-07-03
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Chapter 2 Kinematics in one-Dimension test 1

1、

A:piont P
B:piont Q
C:point R
D:point S
E:not enough information in the graph to decide
答案: piont P

2、

A:piont P
B:piont Q
C:piont R
D:piont S
E:not enough information in the graph to decide
答案: piont R

3、

A:piont P
B:piont Q
C:piont R
D:piont S
E:not enough information in the graph to decide
答案: piont S

4、 You toss a ball straight upward, in the positive direction. The ball falls freely under the influence of gravity. At the highest point in the ball’s motion,

A:its velocity is zero and its acceleration is zero.
B:its velocity is zero and its acceleration is positive (upward).
C:its velocity is zero and its acceleration is negative (downward).
D:its velocity is positive (upward) and its acceleration is zero.
答案: its velocity is zero and its acceleration is negative (downward).

5、

A:vx<0; ax=0
B:vx<0; ax>0
C:vx<0; ax<0
D:vx>0; ax>0
E:vx>0; ax<0
答案: vx<0; ax<0

6、

A:
B:
C:
D:
E:
答案:

7、

A:
B:
C:
D:
E:
答案:

8、

A:
B:
C:
D:
E:
答案:

9、

A:The object is slowing down at a decreasing rate.
B:The object is slowing down at an increasing rate.
C:The object is speeding up at a decreasing rate.
D:The object is speeding up at an increasing rate.
E:The object’s speed is changing at a steady rate.
答案: The object is speeding up at a decreasing rate.

10、 You are given the vx–t graph for an object moving along the x-axis with constant acceleration. Which of the following could you not determine from the information given in this graph alone?

A:the object’s x–acceleration at any time t
B:the object’s x–velocity at any time t
C:the object’s position at any time t
D:more than one of the above
E:misleading question — you could determine all of these from the vx–t graph alone
答案: the object’s position at any time t

11、

A:For t > 0, the object is never at rest.
B:The object is at rest at t = 0.5 s.
C:The object is at rest at t = 1.0 s.
D:The object is at rest at t = 2.0 s.
E:More than one of B., C., and D. is correct.
答案: The object is at rest at t = 1.0 s.

12、

A:twice, first moving in the positive x-direction, then moving in the negative x-direction
B:twice, first moving in the negative x-direction, then moving in the positive x-direction
C:only once, moving in the positive x-direction
D:only once, moving in the negative x-direction
E:never
答案: never

Chapter 3 Kinematics in More Dimensions; Vectors (1) test 2

1、 What are the x– and y–components of the vector E ?

A:Ex = E cos B, Ey = E sin B
B:Ex = E sin B, Ey = E cos B
C:Ex = –E cos B, Ey = –E sin B
D:Ex = –E sin B, Ey = –E cos B
E:Ex = –E cos B, Ey = E sin B
答案: Ex = E sin B, Ey = E cos B

2、 Consider the vectors shown. Which is a correct statement about A+B ?

A:x–component > 0, y–component > 0
B:x–component > 0, y–component < 0
C:x–component < 0, y–component > 0
D:x–component < 0, y–component < 0
E:x–component = 0, y–component > 0
答案: x–component > 0, y–component > 0

3、 Consider the vectors shown. Which is a correct statement about A-B ?

A:x–component > 0, y–component > 0
B:x–component > 0, y–component < 0
C:x–component < 0, y–component > 0
D:x–component < 0, y–component < 0
E:x–component = 0, y–component > 0
答案: x–component < 0, y–component < 0

4、 Which of the following statements is correct for any two vectors A and B ?

A:the magnitude of vector sum A+B is A + B
B:the magnitude of vector sum A+B is A – B
C:the magnitude of vector sum A+B is greater than or equal to |A – B|
D:the magnitude of vector sum A+B is greater than the magnitude of A-B
E: the magnitude of vector sum A+B is
答案: the magnitude of vector sum A+B is greater than or equal to |A – B|

5、 Which of the following statements is correct for any two vectors A and B ?

A:the magnitude of vector subtraction A-B is A – B
B:the magnitude of vector subtraction A-B is A + B
C:the magnitude of vector subtraction A-B is greater than or equal to |A – B|
D:the magnitude of vector subtraction A-B is less than the magnitude of A+B
E:the magnitude of vector subtraction A-B is
答案: the magnitude of vector subtraction A-B is greater than or equal to |A – B|

6、 Consider the vectors shown. What are the components of the vector E=A+D ?

A:Ex = –8.00 m, Ey = –2.00 m
B:Ex = –8.00 m, Ey = +2.00 m
C:Ex = –6.00 m, Ey = 0
D:Ex = –6.00 m, Ey = +2.00 m
E:Ex = –10.0 m, Ey = 0
答案: Ex = –8.00 m, Ey = –2.00 m

7、 Consider the vectors shown. What is the dot product C dot D ?

A:(120 m2 ) cos 78.0°
B:(120 m2 ) sin 78.0°
C:(120 m2 ) cos 62.0°
D:(120 m2 ) sin 62.0°
E:none of these
答案: (120 m2 ) cos 62.0°

8、 Consider the vectors shown. What is the cross product A cross C ?

A:(96.0 m2 ) sin 25.0° k
B:(96.0 m2 ) cos 25.0° k
C:–(96.0 m2 ) sin 25.0° k
D:–(96.0 m2 ) cos 25.0° k
E:none of these
答案: –(96.0 m2 ) cos 25.0° k

9、 Consider the two vectors A = 3 i + 4 j, B = -8 i + 6 j. What is the dot product A dot B ?