Physics 1st semester exam
Note: Any Greek characters have been replaced with a question mark.  Also, subscripts and superscripts look like plain text.  Please correct these expression before using this material in your classroom.
1. How many significant digits are in 0.010 cm?

A) 1   B) 2
C) 3   D) 4

2. This diagram shows:
A) precision   B) accuracy
C) precision and accuracy
D) neither precision nor accuracy

3. How many meters are there in a kilometer?
A) .001  B) .1
C) 100   D) 1000

4. A car is moving at 120.0 km/hr for 15 minutes.  How far will it travel in that time?
A) 0.125 km  B) 8 km
C) 30 km  D) 1800 km

5. Sound travels at a constant speed of 343 m/s in air.  Approximately how long does it take for the sound of thunder to travel 1609 meters (i.e., one mile)?
A) 0.21 seconds
B) 4.69 seconds
C) 551887 m/s

6. Which has a greater displacement: a car that travels from FL to CA or a space shuttle that launches in FL, orbits the earth 12 times, then lands in CA?
A) the car
B) the shuttle
C) neither; they're the same

Acceleration

7. A sporty sports car can go from rest to 32 m/s in 9.0 seconds.  So what is its average acceleration?
A) 3.6 m/s  B) -3.6 m/s
C) 3.6 m/s2  D) 288 m/s

8. Examine this graph.  Which statement is true:  Position
A) The object is speeding up.
B) The object is slowing down.
C) The object is moving at a constant speed.
D) The object is not moving at all.      Time

9. What does the slope represent in the graph by #8?
A) acceleration
B) position
C) time
D) velocity

10. A sprinter accelerates to a velocity of 5.36 m/s in 3.00 s.  His average acceleration is 0.640 m/s2.  What was his velocity when he first started accelerating?
A) 1.78 m/s
B) 3.44 m/s
C) 7.28 m/s
D) 16 m/s

Chapter 2: Kinematic Problems

Which equation would you use to solve the following problems?

11. In getting ready to slam-dunk the ball, a basketball player starts from rest and sprints to a speed of 6.0 m/s in 1.5 s.  Assuming he accelerates uniformly, how far does he travel in this time?
A) ?x = ½(vi + vf)(?t)   B) vf = vi + a(?t)
C) ?x = vi (?t) + ½ a(?t)2  D) vf2 = vi2 + 2a?x

12. The velocity of a train is 26.4 m/s.  At an average acceleration of -1.50 m/s2, how much time is required for the train to decrease its velocity to 9.72 m/s?
A) ?x = ½(vi + vf)(?t)   B) vf = vi + a(?t)
C) ?x = vi (?t) + ½ a(?t)2  D) vf2 = vi2 + 2a?x

Gravity

13. A ball is thrown upward with an initial speed of 35 m/s.  What is its speed 2 seconds later?
A) ?x = ½(vi + vf)(?t)   B) vf = vi + a(?t)
C) ?x = vi (?t) + ½ a(?t)2  D) vf2 = vi2 + 2a?x

14. The Concord achieves a lift-off velocity of 112 m/s in 20.0 s starting from rest.  What acceleration is required to achieve this?
A) ?x = ½(vi + vf)(?t)   B) vf = vi + a(?t)
C) ?x = vi (?t) + ½ a(?t)2  D) vf2 = vi2 + 2a?x

Chapter 3: 2D Motion

15. If you wanted to find out how fast a hang glider was climbing vertically (based on its airspeed), which formula would you use?
A) sin? = opp/hyp
B) cos? = adj/hyp
C) tan? = opp/adj
D) none of the above

16. Which will reach the ground first?
A) Object A
B) Object B
C) Object A and B

17. Which of the following is not an example of a projectile?
A) cruising airplane
B) fastball over home plate
C) football over goal post
D) speeding bullet

18. Which equation would you use to find how long it takes a rock kicked horizontally off a cliff to reach the ground?
A) ?y = -1/2g(?t)2
B) ?x = vi (cos?) ?t
C) ?y = vi (sin?)?t – 1/2g(?t)2
D) vy,f2 = vi2 (sin?)2 – g?y

19. A man walks north 10 meters, then goes southeast for 15 meters, what is his displacement?
A) 11 m
B) 18 m
C) 25 m
D) 150 m

20. If you want to find the maximum height an object moving in two dimensions reaches, which is the best equation to use?
A) ?y = -1/2g(?t)2
B) ?x = vi (cos?) ?t
C) ?y = vi (sin?)?t – 1/2g(?t)2
D) vy,f2 = vi2 (sin?)2 – g?y

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