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PHYS2001 Second Practice Final Exam – Fall 2008
Name:______________________
(Each problem is worth 3.2 points. Problems with a * are more challenging. GOOD LUCK!)
- Velocity is related to acceleration and distance by the following expression: v^2 = 2axp^. What value for p makes this equation dimensionally consistent?
a) 1 b) 2 c) 3 d) 4 e) 5
- A car is traveling due north at 20.4 m/s. What is the velocity of the car after 5.00 s if its acceleration is 1.80 m/s 2 due south?
a) 29.4 m/s south b) 29.4 m/s north c) 11.4 m/s south d) 11.4 m/s north
- A projectile is fired above flat ground with an initial velocity vo at an angle θ with respect to the horizontal (assume that 90o>θ> 0 o^ ). What is the speed of the projectile when it’s at the peak in its trajectory?
a) 0 b) v (^) o c) 9.8 m/s d) v (^) o cosθ e) v (^) o sinθ
- Consider problem 3 again. What is the magnitude of the acceleration of the projectile when it’s at the peak in its trajectory?
a) 0 b) g c) g /2 d) g cosθ e) None of these.
5*. A hot air balloon is descending at a rate of 2.0 m/s when a passenger drops her digital camera. Bummer! If the camera is 125 m above the ground when it’s dropped, how long does it take to hit the ground?
a) 12.76 s b) 5.26 s c) 6.38 s d) 3.14 s e) 4.85 s
- Let’s say after your final exams you decide to have some champagne. If the cork shoots out of the bottle at an angle of 40 o^ above the horizontal and travels a horizontal distance of 4.50 m in 1.25 s, what was the cork’s initial speed (vo )?
a) 3.6 m/s b) 2.8 m/s c) 5.6 m/s d) 4.7 m/s e) None of these.
40 o
v (^) o
- A tennis ball is dropped straight down from the top of a tall building. Due to air resistance, it quickly reaches terminal velocity so that it falls with a constant speed. Once this occurs, which of the following is true?
a) The acceleration of the ball is increasing. b) The acceleration of the ball is zero. c) The net force on the ball is zero. d) Both a and c. e) Both b and c.
- A car drives at constant speed from point A to point E on the road shown in the figure. Which of the following is true?
a) The car’s acceleration between B and C is zero. b) The car’s acceleration between C and D is zero. c) The car’s maximum acceleration occurs between B and C. d) The car’s maximum acceleration occurs between C and D. e) None of these.
9*. Two forces are being applied to a crate as shown. The crate is moving to the left across the floor at constant speed. The coefficient of kinetic friction between the crate and the floor is 0.15. What is the magnitude of F 2?
a) 506 N b) 252 N c) 657 N d) 171 N e) None of these.
- A 2.5-kg block is at rest on a frictionless plane, inclined at 50o^ above the horizontal. What is the value of M, the hanging mass?
a) 0.75 kg b) 1.3 kg c) 1.6 kg d) 1.9 kg e) None of these.
- Two 100-N weights are attached to a scale as shown. What is the reading on the scale?
a) 100 N b) 200 N c) 50 N
d) 0 N e) None of these.
= 500 N
M 50 o
Massless, frictionless pulley
2.5 kg
- A particle, starting from point A in the drawing, is projected down the curved runway. Upon leaving the runway at point B , the particle is traveling straight upward and reaches a height of 4.00 m above the floor before falling back down. What is the speed of the particle at point A?
a) 4.43 m/s b) 12.2 m/s c) 5.6 m/s
d) 19.6 m/s e) None of these.
- A mosquito whose mass is 5.0 × 10 -5^ kg walks straight up a window pane for a vertical distance of 1.0 m. It takes him 49 seconds to do this. How many mosquitos would have to walk this distance, so that their combined power output could run a 60-Watt light bulb, which consumes 60 W of power when glowing?
a) 1 b) 100 c) 52,000 d) 6 million e) 98 billion
- Tom Cruise (84 kg) and Katie Holmes (50 kg) are standing at rest on iceskates, facing one another and gazing longingly into each other’s eyes. Tom then pushes off of Katie and moves away with a speed of 2.3 m/s. With what speed does Katie move away?
a) 0 m/s b) 2.3 m/s c) 3.9 m/s d) 6.8 m/s e) 11.4 m/s
- A grinding wheel, initially at rest, undergoes a constant angular acceleration of 4.5 rad/s^2. How many revolutions does the wheel make in 5.0 s?
a) 11 rev b) 112 rev c) 8.9 rev d) 56 rev e) None of these.
- Yogi Bear (105 kg) and Socola (8.2 kg) are located at opposite ends of a 4.0-m wooden plank that is balanced on a fulcrum as shown. The location of the fulcrum from the left end of the plank is 1.0 m. What is the mass of the plank? Hint: Set your axis of rotation at the fulcrum.
a) 80.4 kg b) 72.2 kg c) 38.4 kg
d) 40.2 kg e) None of these.
3.00 m
4.00 m
Ø
1.0 m
22*. A mass is hung on the end of a vertical spring and stretches it by 0.24 m. If the mass is pulled down further and then released so that it oscillates, what is the frequency?
a) 6.3 Hz b) 42 Hz c) 0.16 Hz d) 1 Hz e) None of these.
- Astronauts on a distant planet set up a simple pendulum of length 1.2 m. The pendulum completes 100 oscillations in 300 s. What is the acceleration of gravity on this planet?
a) 7.2 m/s 2 b) 5.3 m/s 2 c) 0.84 m/s 2 d) 9.8 m/s 2 e) None of these.
- A transverse wave pulse whose frequency is 12 Hz travels the length of a 7.5-m Slinky in 0.62 s. What is the wavelength of the pulse?
a) 1.00 m b) 0.77 m c) 55.8 m d) 145 m e) None of these.
- The bellow of a territorial hippopotamus has been measured at 115 dB above the threshold of hearing. What is the sound intensity?
a) 1.00 W/m^2 b) 0.521 W/m^2 c) 0.188 W/m^2 d) 0.316 W/m^2 e) None of these.
- What is the pressure underneath a right circular cylinder of silver with a height of 15 m? Ignore the pressure due to the atmosphere.
a) 1.54 × 10^6 atm b) 6.7 atm c) 15.2 atm d) 147 atm e) 0.014 atm
- An object is floating in water. Which of the following is true?
a) There is a buoyant force on the object. b) The buoyant force on the object is equal to its weight. c) The buoyant force is equal to the weight of the water displaced by the object. d) The mass of the water displaced by the object is equal to the mass of the object. e) All of the above.
- “An external pressure applied to an enclosed fluid is transmitted throughout the fluid and to the container walls”, is a statement of
a) Archimede’s Principle c) Bernoulli’s Principle e) Pascal’s Principle b) The Golden Rule d) The Equivalence Principle
