QUIZ 1 – Summer 2015
NAME:____________________________________________________
You have one hour to complete this quiz. Answer ALL the problems below.
You may use a standard or scientific calculator, your class notes, and any lecture or lab handouts. You MAY NOT
use a computer, laptop, cellphone or other Internet-connected device.
To receive full credit for calculated values, you MUST INCLUDE UNITS and RECORD THE ANSWER TO THE
APPROPRIATE NUMBER OF SIGNIFICANT FIGURES
Questions 1-6: Circle the letter in front of the ONE correct answer.
1) One set of possible units for stress are:
𝑁
𝑚2
a.
2)
𝑘𝑔
c. 𝑚2
d.
1
𝑃𝑎
e. Unitless
𝑁
𝑚2
b.
𝑚2
𝑁
𝑘𝑔
c. 𝑚2
d.
1
𝑃𝑎
e. Unitless
d.
1
𝑃𝑎
e. Unitless
One set of possible units for Young’s Modulus is:
a.
4)
𝑚2
𝑁
One set of possible units for strain are:
a.
3)
b.
𝑁
𝑚2
b.
𝑚2
𝑁
c.
𝑘𝑔
𝑚2
The following stress/strain curve is typical for a:
a.
b.
c.
d.
e.
5)
Brittle Material
Elastic Material
Ductile Material
Plastic Material
None of the Above
Look at the graph below and circle the letter in front of the correct equation for the graph.
Log(A) vs. Log(B)
a)
b)
c)
d)
e)
Log (A)
10
8
6
4
2
A = 2B + 3
A = 3 B2
A = 3B + 2
A = 2B3
A = 100B3
0
0
1
2
3
Log (B)
Questions 6-7 (2 pts) A piece of spaghetti 10cm long and 2.0mm in diameter has a Euler buckling strength of 1.0
N. You have an sample of spaghetti that is 5.0cm long and 0.10cm in diameter.
The Euler buckling strength for the 5.0 cm long 0.10 cm in diameter piece of spaghetti is:___________________
Questions 8-10: Read the statement and indicate whether the following sentences are true or false.
STATEMENT: Strands of materials A and B are placed under a tensile force of 10 Newtons. Material A
deforms more than Material B.
8)
9)
10)
True / False This behavior may indicate that the bonds in Material B are stronger than the bonds in
Material A.
True / False This behavior may indicate that the cross sectional area of Material B is larger than the
cross sectional area of Material A.
True / False This behavior indicates that Material A must have been stretched beyond its elastic limit.
Questions 11 – 13: Indicate whether the following statements are true or false by circling TRUE or FALSE in front
of each sentence:
11)
12)
13)
True / False When spaghetti is tested in tension it demonstrates significant plastic deformation.
True / False Reducing systemic error is always easy to do.
True / False You count that there are nine cars in the school parking lot on a Saturday morning; the
quantity 9 cars has one significant figure
Questions 14 – 19: Read the statement below and complete the sentences that follow.
STATEMENT: Seven teams of students measure the length of the side of a room. Their answers are shown
below:
10.0 ft; 12.0 ft; 10.2 ft; 10.6 ft; 10.6 ft; 10.2 ft; 10.4 ft;
14-15) The mean of the class data is: _________________________
16-17) The variance of the class data is: ______________________
18-19) The standard deviation of the class data is: _______________
Question 20: Complete the following calculation and report the answer to the correct number of significant
figures.
(1.705+0.5067)
=
(0.2∗1.243)
____________________
Questions 21 -22: Circle the correct answer in each of the statements below.
21)
Shoe size is a discrete / continuous / neither discrete, nor continuous distribution function.
22)
The probability of a coin landing heads up EXACTLY two times out of four tosses is
more than / less than / equal to the probability of a coin landing heads up EXACTLY two times
out of three tosses.