Practice Physics 111 Common Exam 1, Fall 2022
Name (Print): _______________________________
4 Digit ID:________ Section: ______
Honors Code Pledge: For ethical and fairness reasons all students are pledged to comply with the provisions of
the NJIT Academic Honor Code. You must answer the quiz questions entirely by yourself. Turn off all cell
phones, pagers, or other communication devices.
Instructions:
▪ First, write your name and section number on both the Scantron card and this exam sheet.
▪ Use the formula sheet (last exam booklet page) and no other materials.
▪ Budget your time. There are 16 multiple choice problems (1 pt each).
▪ Answer each question on the Scantron card using #2 pencil. Also circle your answers on question papers.
▪ Do not hesitate to ask for clarification of any exam question, if needed, from your proctor or Professor.
____________________________________________________________________________________
1. 2 mm3 is equivalent to:
A) 2 ∙ 10 −3 m3
B) 2 ∙ 10−6 m3
C) 𝟐 ∙ 𝟏𝟎−𝟗 m3
D) 2 ∙ 10 −12 m3
E) 2 ∙ 10−15 m3
For the following 2 problems use the vectors:
̂
̂
⃗ = 𝟏𝐢̂ + 𝟐𝐣̂ + 𝟎𝐤
⃗ = 𝟐𝐢̂ + 𝟐𝐣̂ + 𝟎𝐤
𝐀
and 𝐁
⃗ . Select the closest answer.
2. Find the magnitude of 𝐴 + 𝐵
A)
B)
C)
D)
E)
1
2
3
4
5
⃗ and the angle between vectors:
3. Find the dot product 𝐴 ∙ 𝐵
0
A) 4, 33
B) 12, 380
C) 6, 180
D) 3, 480
E) 9, 230
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5 A body is projected vertically upward from the surface of the earth with a speed of 10.0 m/s. What is its speed
(in m/s) when it is at ½ of its maximum height?
A)
B)
C)
D)
E)
0
2.5
5.0
7.0
10.0
6. A body moves from A to B along a straight line a distance of 100 m in 10 sec. Stops at B for 20 sec. and then
returns to A at an average speed of 5 m/s. The average speed (in m/s) from A to B is:
A)
B)
C)
D)
E)
0
-2
3
4
5
𝑚
𝑚
7. The displacement of a body 𝑥(𝑡) = 10 (𝑚) + 20 ( 𝑠 ) 𝑡 − 5 (𝑠2 ) 𝑡 2 . Find the average velocity for the period
between t=0 and t=5s.
A) 0
B) -1
C) 1
D) -2
E) -5
8. The exhaust fan on a typical kitchen stove pulls 1200 CFM (cubic feet per minute) through the filter. Given
that 1.00 feet = 12in and 1.00 in. = 2.54 cm=0.0254 m, how many cubic meters per second does this fan pull?
A)
B)
C)
D)
E)
0.283 m3/s
0.566 m3/s
3.05 m3/s
32.8 m3/s
64.3 m3/s
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9. The position of an object is given by 𝑥 = 𝑎𝑡 3 − 𝑏𝑡 2 + 𝑐𝑡 where 𝑎 = 4.1𝑚/𝑠 3 , 𝑏 = 2.2𝑚/𝑠 2 and
𝑐 = 1.7𝑚/𝑠. x and t are in SI units. What is the instantaneous acceleration of the
object when 𝑡 = 1.7𝑠?
A)
B)
C)
D)
E)
-13.0 m/s2
2.9 m/s2
4.6 m/s2
37.4 m/s2
19.5 m/s2
10. A marathon is 26.2188 miles long. An expert marathon runner finishes the race in 2 hours. What was her
average speed in SI units?
A) 3.17 m/s
B) 10.1 m/s
C) 4.92 m/s
D) 5.86 m/s
E) 7.44 m/s
11. A car traveling at 55 mi/h (1 mi = 1609 m) suddenly locks its brakes and skids 120 m until it stops. How long
will it take for the car to travel this distance?
A) 9.8 s
B) 1.7 s
C) 3 s
D) 0.8 s
E) 12 s
12. A person on a diet loses 1.6 kg in a week. How many micrograms/second (μg/s) are lost?
A) 2.6 × 103 μg/s
B) 1.6 × 105 μg/s
C) 44 μg/s
D) 6.4 × 104 μg/s
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13. Vectors A and B are shown in the figure. What is |-5.00A + 4.00B |
A) 31.8
B) -32.0i - 2.00j
C) 1028
D) 34.0
E) -3.00i - 42.0j
14. A small rock is thrown vertically upward with a speed of 22.0 m/s from the edge of the roof of a 30.0-m-tall
building. The rock doesn’t hit the building on its way back down and lands on the street
below. Ignore air resistance. What is the speed of the rock just before it hits the street?
Ans. Speed = 32.7m/s
15. In the previous problem find how much time elapses from when the rock is thrown until it hits the street?
Ans: t=5.59 s
16. A block is sliding with constant acceleration down an incline. The block starts from rest at t = 0 and has speed
3.00 m/s after it has traveled a distance 8.00 m from its starting point. (a) What is the speed of the block when it
is a distance of 16.0 m from its t = 0 starting point? (b) How long does it take the block to slide 16.0 m from its
starting point?
a) vx=4.24 m/s
b) t= 7.54 s
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