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PHYS2001 – Fall 2010 Practice Final Exam A
- During a hard sneeze, your eyes will shut for 0.5 s. If you are driving a car at 90 km/h during such a sneeze, how far does the car move during that time?
A. 45 m B. 180 m C. 13 m D. 50 m E. None of these.
- An LSU football defender is 6 m behind a Georgia Tech receiver who has the football and is d meters from making a touchdown. If the LSU player is running at 5 m/s and the receiver is running at 4 m/s, what is the furthest distance, d , that the Tech player can be from the goal line and still make a touchdown?
A. 20 m B. 24 m C. 10 m D. 30 m E. 12 m
- Two golf balls are thrown with the same speed off the top of a large bridge at the same time. Ball A is thrown straight downward, and Ball B is thrown horizontally off the bridge. Which ball hits the ground first?
A. Ball A B. Ball B C. Both balls hit at the same time. D. We would need to know the speed.
LSU player
GA Tech player End^ zone
6 m d
- As an apple tree is transported by a truck moving left to right with a constant velocity, one of its apples shakes loose and falls toward the bed of the truck. Of the curves shown below, which best describes the path followed by the apple as seen by a stationary observer on the ground?
A. Ds B. dd C. dd D. dfd E. dd
- A diver springs vertically upward with an initial speed of 1.7 m/s from a diving board that is 3.2 m above the water. Find the speed with which she enters the water, assuming completely vertical motion.
A. 5.6 m/s B. 7.7 m/s C. 8.0 m/s D. 7.9 m/s E. 8.1 m/s
- A 2.0-m-tall basketball player is standing on the floor a distance d from the basket, as shown in the figure below. He shoots the ball at an angle of 40.0o^ above the horizontal with a speed of 10.67 m/s and makes the shot. The height of the basket is 3.05 m. What is d?
A. 4.67 m B. 13.1 m C. 7.55 m D. 10.0 m E. None of these.
- Which of the following pertains to Newton’s 3 rd^ law?
A. F = ma B. Law of Inertia C. Action = Reaction D. Robots must protect their own existence. E. None of these.
d
- A picture of Socola hangs from my ceiling by two strings, as shown in the figure. The weight of the picture is 100 N. What is the tension in each string?
A. 57.7 N
B. 86.6 N
C. 100 N
D. 200 N
E. None of these.
- Two masses lie on the x-axis as shown. The only force that acts on the two masses is the gravitational force between them. What is the magnitude and direction of the net gravitational force that acts on the smaller mass?
A. 3.34×10 -8^ N, +x direction B. 3.34×10 -8^ N, -x direction C. 1.67×10 -8^ N, +x direction D. 1.67×10 -8^ N, -x direction E. None of the above.
- If the speed of a particle is doubled, what happens to its kinetic energy?
A. It doubles. B. It quadruples. C. It decreases by square root of 2. D. It decreases by a factor of 2. E. None of these.
- A bead of mass m = 7.00 kg is released from point A and slides on the frictionless track (see below). What is the speed of the bead at point B?
A. 5.94 m/s B. 3.55 m/s C. 12.6 m/s D. 35.3 m/s E. None of these.
120 o^120 o
50 kg (^) 20 kg
x = 0 (^) x = 2 m x
- An SUV with a mass of 1.80×10 3 kg is travelling eastbound with a speed of +15.0 m/s, while a compact car with a mass of 9.00×10^2 kg is travelling westbound at -15.0 m/s. The vehicles collide head-on and stick together. What is the speed of the wreck immediately after the collision, and which way does it move?
A. 10.0 m/s, eastbound B. 10.0 m/s, westbound C. 5.00 m/s, eastbound D. 5.00 m/s, westbound E. None of these.
- The angular speed of the rotor in a centrifuge decreases from 226 to 186.0 rev/s with an angular deceleration of 6.4 rev/s^2. During this period, how many revolutions does the rotor turn?
A. 873 rev B. 201 rev C. 1288 rev D. 3.13 rev E. 125 rev
- A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius 11.0 m. A passenger feels the seat of the car pushing upward on her with a force equal to three times her weight at the bottom of the dip. What is her speed as she goes through the dip?
A. 13.6 m/s B. 17.3 m/s C. 18.0 m/s D. 14.7 m/s E. 20.8 m/s
- Socola and Brooke are balanced on a teeter-totter plank as shown below. Socola has a mass of 7.7 kg, and Brooke’s mass is 53 kg. Brooke is located 1.0 m from the pivot. Assume the plank is massless , and calculate how far Socola is from the pivot ( x ).
A. 7.9 m B. 6.9 m C. 4.2 m D. 0.15 m
E. None of these. Ø
Socola
Brooke
x^ 1.0^ m
- The loudest sound in Earth’s history is believed to be the explosion of the volcanic island of Krakatoa, back in 1883. Physicists estimate that the intensity of the sound produced was 1.0×10^7 W/m^2. How many decibels does this correspond to?
A. 50 dB B. 120 dB C. 190 dB D. 270 dB E. None of these.
- A solid block of some material is floating in water. Which of the following is true?
A. The density of the object is less than the density of water. B. The buoyant force on the block is equal to the weight of the water the block displaces. C. The mass of the block is equal to the mass of the displaced water. D. All of the above are true. E. None of the above are true.
- If the input piston of a hydraulic jack has a radius of 0.005 m, what force is necessary to apply to it to lift a 1500-kg car on the output piston whose radius is 0.5 m?
A. 15 N B. 0.15 N C. 147 N D. 1.47 N E. 6 N
27. What is the absolute pressure at the bottom of a storage tank of oil 18-m deep that is open to the atmosphere? Take the density of oil to be 800 kg/m^3_._
A. 2.45× 10 4 Pa B. 2.42× 105 Pa C. 1.01× 105 Pa D. 2.16× 105 Pa E. 2.77× 105 Pa
- A cube of balsa wood (side length = 0.25 m) is tied with a string to the bottom of a water- filled container. The wood is completely immersed. What is the tension in the string?
A. 21.4 N B. 132 N C. 111 N D. 312 N E. None of these.
- A 1.0-m thin rod of aluminum is laid end-to-end with a 1.0-m thin rod of steel. The rods are initially at 25 o^ C. What is the total length of both rods when heated to 450 o^ C?
A. 2.000 m B. 2.009 m C. 1.015 m D. 2.015 m E. None of these.
- A 5-kg block of ice is at a temperature of -27 °C. How much heat must be added to the ice to produce 5 kg of liquid water with a final temperature of 35 o^ C?
A. 2.30× 10 6 J B. 2.68× 10 6 J C. 2.46× 106 J D. 2.97× 10 6 J E. 2.59× 106 J
1.0 m 1.0 m
Steel (^) Aluminum
