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IMPORTANT NOTE TO PHYS 2001 STUDENTS, SPRING 2009
PRACTICE TESTS 2 AND 3
THE PRACTICE TESTS FOR TEST 2 DO NOT INCLUDE PROBLEMS FOR CHAPTER 6 (WHICH WILL BE COVERED ON OUR TEST #2 ON MARCH 18)
FOR PRACTICE PROBLEMS RELATED TO CHAPTER 6 (WORKโENERGY, POWER, ETC) REFER TO THE
FOLLOWING PROBLEMS ON PRACTICE TEST 3:
PRACTICE TEST 3: #1, 2, 4, 5, 6, 7
SECOND PRACTICE TEST 3: #17, 18, 19
Fall 2008
Name:______________
SS# xxx-xx-_______
- A skydiver jumps from an airplane and falls straight down. Due to air resistance, she quickly reaches terminal velocity so that she falls with a constant speed. Once this occurs, which of the following is true?
a) Her acceleration is increasing. b) Her acceleration is zero. c) The net force on her is zero. d) Both a and c. e) Both b and c.
- A car is traveling at constant speed along the road ABCDE shown in the drawing. Sections AB and DE are straight. Rank the carโs acceleration in each of the four sections according to magnitude, listing the smallest first.
a) AB, BC, CD, DE b) AB, DE, CD, BC c) BC, CD, DE, AB d) CD, DE, AB, BC e) AB, DE, BC, CD
- If the distance between two planets increases by a factor of ten, then the gravitational force between them will
a) Increase by a factor of 10. b) Decrease by a factor of 10. c) Increase by a factor of 100. d) Decrease by a factor of 100. e) None of these.
- A steel ball is attached to a string and is swung in a circular path in a horizontal plane as illustrated in figure below. At point P, the string suddenly breaks near the ball. If this event is observed directly from above, and we neglect gravity, which of the paths 1-5 below would the ball most closely follow after the string breaks?
a) 1 b) 2 c) 3 d) 4 e) 5
P
Fall 2008
- An 8-kg box has only two forces acting on it as shown in the figure below. Find the magnitude and direction (with respect to the positive x-axis) of the acceleration of the object.
a) 12.5 m/s 2 at 56.3 o b) 9.0 m/s 2 at 33.7o c) 9.0 m/s 2 at 56.3o d) 72 m/s 2 at 33.7o e) 72 m/s 2 at 56.3o
- A liquor store sign with a mass of 65 kg is suspended from two cables as shown in the figure below. What is the tension in each cable?
a) 319 N b) 450 N c) 637 N d) 795 N e) 1100 N
- A 5.0-kg block is sliding down an inclined plane that makes an angle of 65o^ with the horizontal. If the coefficient of kinetic friction between the block and plane is 0.23, what is the magnitude of the kinetic frictional force that acts on the block?
a) 49 N b) 44.4 N c) 39.6 N d) 9.2 N e) 4.76 N
- A child is twirling a 0.15-kg ball on a string in a horizontal circle whose radius is 0.10 m. The period of the motion is 0.37 s. What is the centripetal force that acts on the ball?
a) 4.3 N b) 2.3 N c) 1.5 N d) 0.97 N e) 0.52 N
40 N +x
+y
60 N
m = 8 kg
45 o 45 o
65 o
Fall 2008
- The space shuttle is located in a low orbit at a distance of 1.6 ร 105 m above the surface of the earth. If gravity is the only force acting on the shuttle, what is the shuttleโs speed while in this orbit?
a) 575 m/s b) 1240 m/s c) 7810 m/s d) 7910 m/s e)17,400 m/s
- A 75-kg man is attempting a dangerous stunt in which he swings on a single cable of 25 m in length attached to the Skyway Bridge over Tampa Bay. The man swings along the arc of a vertical circle. If at the lowest point of the swing, he is moving at a speed of 12 m/s, what is the magnitude of the centripetal force acting on him at this point, and what is the tension in the cable?
a) Fc = 735 N, T = 1167 N b) Fc = 735 N, T = 432 N c) Fc = 432 N, T = 120 N d) Fc = 432 N, T = 1167 N e) Fc = 432 N, T = 735 N
- A spaceship is going to โparkโ between two stationary planets A and B that are separated by a distance of 20 m. The mass of planet A is 50 kg, and the mass of planet B is 70 kg. How far (d) from planet A should the spaceship be so that the net force on it from both planets is zero?
a) 4.5 m b) 7.6 m c) 9.2 m d) 11.7 m e) 12.5 m
Some constants you may need:
Mass of the earth = 5.98 ร 10 24 kg Mass of the moon = 7.35 ร 10 22 kg Radius of the earth = 6.38 ร 106 m Acceleration of gravity on earth = 9.8 m/s^2 Acceleration of gravity on moon = 1.6 m/s^2 Universal Gravitational Constant: G = 6.67 ร 10 -11^ Nโ
m^2 /kg^2
20 m
A (^) B
d
25 m
v=12 m/s
ship
