Download 2013 Sem 1 Midterm Answer Section

2013 Sem 1 Midterm
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
1. The speed of a boat is often given in knots. If a speed of 5 knots were expressed in the SI system of units, the units
would be:
a. m.
b. s.
c. m/s.
d. kg/s.
e. m2.
2. Which answer has the correct significant figures? 12.4 + 11 + 67.37 + 4.201=?
a. 94.971
b. 94.97
c. 95.0
d. 95
e. 100
3. The number 0.00017 has how many significant figures?
a. 2
b. 3
c. 5
d. 6
e. 4
4. Multiplying a 2 significant figure number by a 3 significant figure number and then dividing the product by a six
significant figure number yields a number with how many significant figures?
a. 5/6
b. 1
c. 2
d. 11
e. 5
5. Which of the following is not a vector quantity?
a. temperature
b. velocity
c. acceleration
d. displacement
e. force
6. A bird experiences a displacement of 28 m in 11 s. What is its average velocity?
a. 1.7 m/s
b. 2.5 m/s
c. 3.4 m/s
d. 4.2 m/s
e. zero
7. Jeff throws a ball straight up. For which situation is the vertical velocity zero?
a. on the way up
b. at the top
c. on the way back down
d. both a and c are correct
e. none of the above
8. A cart is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.0 m/s 2. What is the
magnitude of the cart's displacement during the first 6.0 s of its motion?
a. 10 m
b. 55 m
c. 66 m
d. 80 m
e. 97 m
9. An automobile driver puts on the brakes and decelerates from 30.0 m/s to zero in 10.0 s. What distance does the
car travel?
a. 150 m
b. 196 m
c. 336 m
d. 392 m
e. 421 m
10. Gwen releases a rock at rest from the top of a 40-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is
the speed of the rock as it hits the ground?
a. 28 m/s
b. 30 m/s
c. 56 m/s
d. 120 m/s
e. 784 m/s
11. Which type of quantity is characterized by both magnitude and direction?
a. scalar
b. vector
c. trigonometric
d. algebraic variable
e. dimensional
12. A hiker walks 200 m west and then walks 100 m north. In what direction is her resulting displacement?
a. north
b. west
c. northwest
d. east
e. None of the answers is correct.
13. A ball is rolled horizontally off a table with an initial speed of 0.24 m/s. A stopwatch measures the ball's trajectory
time from table to the floor to be 0.30 s. What is the height of the table? (g = 9.8 m/s2 and ignore air resistance)
a. 0.11 m
b.
c.
d.
e.
0.22 m
0.33 m
0.44 m
0.55 m
14. If we know an object is moving at constant velocity, we may assume:
a. the net force acting on the object is zero.
b. there are no forces acting on the object.
c. the object is accelerating.
d. the object is losing mass.
e. the net force acting on the object isn't zero.
15. A 7.0-kg bowling ball experiences a net force of 5.0 N. What will be its acceleration?
a. 35 m/s2
b. 7.0 m/s2
c. 5.0 m/s2
d. 0.71 m/s2
e. 0.52 m/s2
16. In the terminology a 500-N block, the 500-N refers to the block's:
a. mass.
b. force.
c. weight.
d. None of the above.
e. Both a and c are correct.
17. A sled weighs 100 N. It is held in place on a frictionless 20 slope by a rope attached to a stake at the top; the rope
is parallel to the slope. Find the tension in the rope.
a. 94 N
b. 47 N
c. 37 N
d. 34 N
e. 28 N
18. Ellen is moving into her dorm room. She pushes a box of Christmas lights 5.00 m by applying a 25.0-N
horizontal force. What work does she do?
a. 10.0 J
b. 25.0 J
c. 125 J
d. 550 J
e. 750 J
19. Which of the following is that form of energy associated with an object's motion?
a. potential
b. thermal
c. bio-chemical
d. kinetic
e. nuclear
20. A rock is thrown straight up with an initial velocity of 15.0 m/s. Ignore energy lost to air friction. How high will
the rock rise?
a. 1.53 m
b. 22.9 m
c. 6.50 m
d. 11.5 m
e. 13.6 m
21. A bobsled makes a run down an ice track starting at 150 m vertical distance up the hill. If there is no friction, what
is the velocity at the bottom of the hill?
a. 27 m/s
b. 36 m/s
c. 45 m/s
d. 54 m/s
e. 65 m/s
22. The rate at which work is done is equivalent to which of the following?
a. increase in potential energy
b. thermal energy
c. potential energy
d. power
e. kinetic energy
23. Yuri, a Russian weightlifter, is able to lift 250 kg 2.00 m in 2.00 s. What is his power output?
a. 500 W
b. 2.45 kW
c. 4.90 kW
d. 9.80 kW
e. 10.0 kW
24. The free-body diagram shown above represents a car being pulled by a towing cable. In the diagram, which of the
following is the gravitational force acting on the car?
a. 5800 N
c. 14 700 N
b. 775 N
d. 13 690 N
25. The statement by Newton that for every action there is an equal but opposite reaction is which of his laws of
motion?
a. first
c. third
b. second
d. fourth
26. In the figure above, which diagram represents the vector addition C = A + B?
a. I
c. III
b. II
d. IV
27. What is the path of a projectile (in the absence of friction)?
a. a wavy line
b. a parabola
c. a hyperbola
d. Projectiles do not follow a predictable path.
28. The SI base unit used to measure mass is the
a. meter.
b. second.
c. kilogram.
d. liter.
29. If electricity costs $.12 per kWh and you have to plug your 3000W charger into your Tesla electric car for 6 hours
to charge it, how much will that cost?
a. $.12
c. $216
b. $2.16
d. $60
30. Please bubble in all 5 answer choices for a free point!
a. A
b. B
c. C
d. D
e. E
2013 Sem 1 Midterm
Answer Section
MULTIPLE CHOICE
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
TOP:
ANS:
TOP:
ANS:
TOP:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
ANS:
C
DIF: 1
TOP: 1.3 Dimensional Analysis
D
DIF: 1
TOP: 1.4 Uncertainty in Measurement and Significant Figures
A
DIF: 2
TOP: 1.4 Uncertainty in Measurement and Significant Figures
C
DIF: 3
TOP: 1.4 Uncertainty in Measurement and Significant Figures
A
DIF: 1
TOP: 2.1 Displacement
B
DIF: 1
TOP: 2.2 Velocity
B
DIF: 1
TOP: 2.2 Velocity
C
DIF: 2
TOP: 2.5 One-Dimensional Motion with Constant Acceleration
A
DIF: 2
TOP: 2.5 One-Dimensional Motion with Constant Acceleration
A
DIF: 2
TOP: 2.6 Freely-Falling Objects
B
DIF: 1
TOP: 3.1 Vectors and Their Properties
E
DIF: 2
TOP: 3.2 Components of a Vector
D
DIF: 2
TOP: 3.4 Motion in Two Dimensions
A
DIF: 1
4.1 Forces | 4.2 Newton's First Law | 4.3 Newton's Second Law | 4.4 Newton's Third Law
D
DIF: 1
4.1 Forces | 4.2 Newton's First Law | 4.3 Newton's Second Law | 4.4 Newton's Third Law
C
DIF: 1
4.1 Forces | 4.2 Newton's First Law | 4.3 Newton's Second Law | 4.4 Newton's Third Law
D
DIF: 2
TOP: 4.5 Applications of Newton's Laws
C
DIF: 1
TOP: 5.1 Work
D
DIF: 1
TOP: 5.2 Kinetic energy and the Work-Energy Theorem
D
DIF: 2
TOP: 5.3 Gravitational Potential Energy
D
DIF: 2
TOP: 5.3 Gravitational Potential Energy
D
DIF: 1
TOP: 5.6 Power
B
DIF: 2
TOP: 5.6 Power
C
DIF: II
OBJ: 4-1.2
C
DIF: I
OBJ: 4-3.3
B
DIF: I
OBJ: 3-1.2
B
DIF: I
OBJ: 3-3.2
C
DIF: I
OBJ: 1-2.1
B
B