PHYS 1110 Exam 2

Questions

Exam 2 comprised 28 questions. Each question was applied to one or more of the course standards. The answers to the questions, and the standard(s) to which each question was applied, are as follows.

Question Answer Note

1A μ_sg Preparatory to 1C. If you hadn't already satisfied standard 15, this suffices.

1B m₁μ_sg Preparatory to 1C. If you hadn't already satisfied standard 15, this suffices.

1C (m₁+m₂)μ_sg Standard 19. Also, if you hadn't already satisfied standard 15, this suffices.

2A 25.1 m. The unit was specified in the question, so it was not required in your answer. Standard 20.

2B 2.00 s Standard 20

2C π rad/s Standard 20

2D e. Centripetal acceleration is inward Standard 21

2E 39.5 m/s² Standard 21

3 6.14×10²⁵ N Standard 22

4 6.00×10¹⁶ kg. The units were not specified in the question, so you needed to identify the units in yor answer. Standard 23

5 joule. The unit name is NOT capitalized, but there was no penalty if you capitalized the name. Standard 25

6 d. Work is a scalar. Standard 25

7 a. The angle you want is α; the trigonometric function you want is the cosine. Standard 24

8A e. Dot product is a scalar, with no direction. Standard 24

8B a. The cosine of an angle θ is greatest when θ = 0. Standard 24

8C a. The dot product is commutative. Standard 24

8D 2 Standard 24

9 7180 J Standard 25

10 4700 J Standard 26

11A 2200 N/m There is no specific standard for Hooke's law, but this problem is preparatory to 11B.

11B 67 J Standard 26

12A 553 J Standard 27

12B 5.652 m/s Standard 26

13A 44 kg·m/s Standard 30

13B 1.3 m/s Standard 29

14 0.33 m Standard 28

15A 18500 kg·m/s Standard 29

15B 20400 kg·m/s Standard 29

Question	Answer	Note
1A	μ_sg	Preparatory to 1C. If you hadn't already satisfied standard 15, this suffices.
1B	m₁μ_sg	Preparatory to 1C. If you hadn't already satisfied standard 15, this suffices.
1C	(m₁+m₂)μ_sg	Standard 19. Also, if you hadn't already satisfied standard 15, this suffices.
2A	25.1 m. The unit was specified in the question, so it was not required in your answer.	Standard 20.
2B	2.00 s	Standard 20
2C	π rad/s	Standard 20
2D	e. Centripetal acceleration is inward	Standard 21
2E	39.5 m/s²	Standard 21
3	6.14×10²⁵ N	Standard 22
4	6.00×10¹⁶ kg. The units were not specified in the question, so you needed to identify the units in yor answer.	Standard 23
5	joule. The unit name is NOT capitalized, but there was no penalty if you capitalized the name.	Standard 25
6	d. Work is a scalar.	Standard 25
7	a. The angle you want is α; the trigonometric function you want is the cosine.	Standard 24
8A	e. Dot product is a scalar, with no direction.	Standard 24
8B	a. The cosine of an angle θ is greatest when θ = 0.	Standard 24
8C	a. The dot product is commutative.	Standard 24
8D	2	Standard 24
9	7180 J	Standard 25
10	4700 J	Standard 26
11A	2200 N/m	There is no specific standard for Hooke's law, but this problem is preparatory to 11B.
11B	67 J	Standard 26
12A	553 J	Standard 27
12B	5.652 m/s	Standard 26
13A	44 kg·m/s	Standard 30
13B	1.3 m/s	Standard 29
14	0.33 m	Standard 28
15A	18500 kg·m/s	Standard 29
15B	20400 kg·m/s	Standard 29

Standards

The criteria for satisfying the standards are explained in the table below. Each standard is determined from one or more of the exam questions. The second column of the table gives the criteria for determining if the standard is satisfied.

Standard Criterion

19 Correctly answer 1C

20 2.5 of 3 in 2A, 2B, and 2C

21 1.8 of 3 in 2D, 2E, and 4

22 Correctly answer 3

23 Correctly answer 4

24 3.5 of 5 in 7, 8A, 8B, 8C, 8D

25 2.5 of 3 in 5, 6, and 9

26 2.5 of 3 in 10, 11B, and 12B

27 Correctly answer 12A

28 Correctly answer 14

29 1.5 of 3 in 13B, 15A, and 15B

30 Correctly answer 13A

Standard	Criterion
19	Correctly answer 1C
20	2.5 of 3 in 2A, 2B, and 2C
21	1.8 of 3 in 2D, 2E, and 4
22	Correctly answer 3
23	Correctly answer 4
24	3.5 of 5 in 7, 8A, 8B, 8C, 8D
25	2.5 of 3 in 5, 6, and 9
26	2.5 of 3 in 10, 11B, and 12B
27	Correctly answer 12A
28	Correctly answer 14
29	1.5 of 3 in 13B, 15A, and 15B
30	Correctly answer 13A

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