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PHY 1301 Final Exam – Question and Answers

1. In the International System of Units, length is measured using which of the following units?
2. Which of the following units is not an SI base unit?
3. If the mass of a vehicle is 100 kg, what is the weight of the vehicle on Earth? The acceleration due to gravity on Earth is 9.8 m/s2.
4. Which one of the following forces is considered a fundamental force?
5. The initial kinetic energy in a system was 0 J, and the initial potential energy was 500 J. If the final kinetic energy is measured as 500 J, what is the final potential energy of the system? Ignore frictions.
6. If a satellite orbits Earth in a uniform circular motion, what is the direction of the centripetal acceleration of the satellite?
7. A boy exerts an average force of 100 N on a toy cart for 0.7 seconds. What is the impulse?
8. A girl exerts an average force of 50 N on a toy cart for 0.5 seconds. What is the impulse?
9. A spring has a spring constant of 100 N / m. Find the magnitude of the force needed to compress the spring by 0.1 m.
10. A spring has a spring constant of 10 N / m. Find the magnitude of the force needed to compress the spring by 0.1 m.
11. The pressure acting on a floating piece of wood is measured by 1000 Pascals, and its surface area is 0.01m2 . What is the magnitude of the force in Newtons?
12. Which one of the following is the coldest temperature?
13. Which one of the following variables is the best indicator of thermal equilibrium between two systems in thermal contact?
14. Which one of the following is not a correct description of Stefan-Boltzmann’s law?
15. Which one of the following is not a correct description of ideal gas law?
16. Consider an isobaric expansion of a substance in a laboratory. The constant pressure is measured as 20,000 Pascal. The initial volume of the substance is 0.001 m3 , and the final volume of the substance is 0.01 m3 . Calculate the work done through this process.
17. A system does 100 J of work to its surroundings and gains 50 J of heat in the process. Calculate the change in the internal energy of the system. Determine if the internal energy is increased or decreased during the process.