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Physics 204 Lab Final Exam: Follow-up Questions and Answers, Exams of Physics

A set of follow-up questions and answers related to the physics 204 lab final exam. It covers various concepts in mechanics, including motion, velocity, acceleration, forces, work, and energy. The questions are designed to test understanding of fundamental principles and their application in real-world scenarios. Valuable for students preparing for their physics 204 lab final exam.

Typology: Exams

2024/2025

Available from 12/07/2024

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204 Physics Lab Final - Follow up
Questions with Phys 204 lab final Exam
Combination Questions with Answers.
1a) If the position of an object is zero at one instant, what is true about
the velocity of that object? (May be more than one.) - ✔✔the velocity
could be negative, the velocity could be positive, the velocity could be
zero
1b) The slope of a position versus time graph gives - ✔✔Velocity
1c) The motions of a car and a truck along a straight road are
represented by the velocity-time graphs in the figure. The two vehicles
are initially alongside each other at time t = 0. At time T, what is true of
the distances traveled by the vehicles since time t = 0? - ✔✔The truck
will have travelled further than the car
1d) Which of the following situations is impossible - ✔✔An object has
constant non-zero velocity and changing acceleration.
1e) The figure shows a color coded graph of the position x of a red car
and a blue car as a function of time t. According to this graph, which
statements about these cars must be true? (May be more than one.) -
✔✔-Both cars have the same acceleration.
-The cars meet at time t = 10 s.
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204 Physics Lab Final - Follow up

Questions with Phys 204 lab final Exam

Combination Questions with Answers.

1a) If the position of an object is zero at one instant, what is true about the velocity of that object? (May be more than one.) - ✔✔the velocity could be negative, the velocity could be positive, the velocity could be zero 1b) The slope of a position versus time graph gives - ✔✔Velocity 1c) The motions of a car and a truck along a straight road are represented by the velocity-time graphs in the figure. The two vehicles are initially alongside each other at time t = 0. At time T, what is true of the distances traveled by the vehicles since time t = 0? - ✔✔The truck will have travelled further than the car 1d) Which of the following situations is impossible - ✔✔An object has constant non-zero velocity and changing acceleration. 1e) The figure shows a color coded graph of the position x of a red car and a blue car as a function of time t. According to this graph, which statements about these cars must be true? (May be more than one.) - ✔✔-Both cars have the same acceleration.

  • The cars meet at time t = 10 s.

2a) A motorist wishes to travel 40 kilometers at an average speed of 40 km/hr. During the first 20 kilometers, an average speed of 40 km/hr is maintained. During the next 10 kilometers, however, the motorist goofs off and averages only 20 km/hr. To drive the last 10 kilometers and average 40 km/hr, the motorist must drive - ✔✔faster than the speed of light 2b) Suppose that a car traveling to the west begins to slow down as it approaches a traffic light. Which of the following statements about its acceleration is correct? (May be more than one) - ✔✔-The acceleration is toward the east.

  • Since the car is slowing down, its acceleration must be negative. 2c) The motion of an object is described in the velocity vs. time graph shown in the figure. (-2.5 m/s to 3.5 m/s). Over the nine-second interval shown, we can say that the speed of the particle - ✔✔decreases then increases 3a) In the figure, a 10-lb weight is suspended from two spring scales, each of which has negligible weight. Which one of the following statements about the readings in the scales is true? - ✔✔none are true (both scales should read 10 lbs) 3b) Bill and his daughter Susan are both standing on identical skateboards (with really good frictionless ball bearings), initially at rest.

Since both shells were fired at the same speed, the shell fired at an angle closest to 45 degrees lands farther away. 4b) Suppose I were to climb a ladder and set two balls into motion in the following way: The red ball will be dropped (i.e I'll just let go of it). The blue ball will be thrown with a velocity of magnitude Vo, directed horizontally. You may assume that air resistance can be ignored, and neither ball will run into another object before hitting the floor. If the balls are identical other than their color, and are released at the same time: - ✔✔-Both balls will land at the same time.

  • the blue ball will have the higher velocity when it lands 6a) The eastward component of vector Va→ is equal to the westward component of vector Vb→ and their northward components are equal. Which one of the following statements must be correct for these two vectors? - ✔✔The magnitude of vector A is set as correct is equal to the magnitude of vector B

6b) Inside of a train a ball of weight W is hanging by a light wire at rest from the ceiling. The wire makes an angle θ with the ceiling, as shown in the figure. Which one of the following conditions must be true about the tension T in the wire? - ✔✔t * sin (theta) = weight 7a) One of your classmates drew a force diagram for a pendulum bob at the bottom of its swing. He put a horizontal force arrow in the direction of the velocity. Evaluate his diagram by choosing from the statements below. - ✔✔He is incorrect since there are no forces in the direction of the objects velocity. 7b) How does a person standing on the ground correctly explain why you, sitting on the left side of a slippery back car seat, slide to the right when the car makes a high speed left turn? - ✔✔You tend to move in a straight line and thus slide with respect to the seat that is moving to the left under you 7c) If you put a penny near the center of a rotating turntable, it does not slip. However, if you place the penny near the edge, it is likely to slip off. Which answer below explains this observation? - ✔✔The radial acceleration is greater at the edge and the friction force is not enough to keep the penny in place. 7d) Why is it difficult for a high-speed car to negotiate an unbanked turn? - ✔✔The force of friction may not be large enough to provide the needed radial acceleration.

  • Object 1 exerts a 10 newton force on object 2 in the direction of its 1 meter displacement.
  • Object 1 exerts a 1 newton force on object 2 in the direction of its 10 meter displacement
  • Object 1 exerts a 10 newton force at a 60 degree angle relative to its 2 meter displacement. 9d) Two smooth tracks of equal length have "bumps" - A up and b down. Both of same curvature. If two balls start simultaneously with some initial speed, the ball to complete its journey first is along track? - ✔✔B 9e) Choose which statements describe a process in which an external force does negative work on a system. The person is not part of the system. Choose all that apply. - ✔✔-A person slowly lowers a box from a tabletop to the floor.
  • A person pushes on a moving heavy box, bringing it to a stop. 30 degrees - Correct Ans: ✔✔A ray of light is incident on a plat mirror with an incident angle of 30 degrees. What best represents the location of the image in the flat mirror? 67 degrees - Correct Ans: ✔✔A ray of light travels form water to air. The angle of insident, as depicted in this figure, is 45 degrees. What is the refracted angle? (water has an index of refraction of n=1.3)

2 x 10 ^8 m/s - Correct Ans: ✔✔the speed of light in a vacuum is 3x 10^8 m/s. Glass has an index of refraction of n=1.5. What is the speed of light in glass? the light is bent away from the normal - Correct Ans: ✔✔What happens when light passes from a medium with higher index of refeaction to a medium with a lower index of refraction, for example from n1= 1.3 to n2= 1.0? 12 cm - Correct Ans: ✔✔If the object distance (p) is 30 cm and the image distance (q) is 20 cm and the image is inverted, what is the focal length of the lens? closer to - Correct Ans: ✔✔Spherical aberration occurs when light rays passing through the outer edge of the lens are focused __________________ the lens than rays passing through the center of the lens. upright, smaller - Correct Ans: ✔✔A thin lens produced an image with a magnification of +0.5. What does this mean compared to the original object? 2 - Correct Ans: ✔✔I have an object that is 2 cm high. I observe it to be 4 cm high the a magnifying glass. what is the magnitude of the magnification?