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# Final Exam Review 2024 (Day 1) ## Multiple Choice 1. How can the direction of a magnetic field be identified at any given location? * the direction toward which the north pole of a compass needle points 2. Which statement describes Kepler's third law? * The cube of the orbital per...

# Final Exam Review 2024 (Day 1) ## Multiple Choice 1. How can the direction of a magnetic field be identified at any given location? * the direction toward which the north pole of a compass needle points 2. Which statement describes Kepler's third law? * The cube of the orbital period is proportional to the cube of the orbit's semimajor axis. 3. Where is the magnitude of the magnetic field around a permanent magnet greatest? * It is greatest closest to the poles 4. One astronomical unit is equal to the average distance between Earth and the sun, or 1.496 x 108 km. * True 5. When electrons move through a metal conductor, * they move in zigzag patterns because of repeated collisions with the vibrating metal atoms. 6. An increase in which of these will increase the drift velocity of electrons in a wire? * electric field strength 7. The equation for gravitational force is an inverse-square relationship. The force of gravity is directly proportional to the square of the distance. * False 8. Which of the following symbols represents the constant of universal gravitation? * G 9. A bar magnet is broken into halves at the line separating the north and south poles. Which statement is true about the two new pieces? * Each piece has turned into a bar magnet with its own north and south poles. 10. How can ferromagnetic material become magnetized? * by being placed in the presence of a permanent magnet 11. An object is orbiting at a distance of 10,000 km from the center of a planet. The gravitational force between the object and the planet is 10.0 N. What would the gravitational force be if the object were orbiting at a distance of 5,000 km? * 40.0 N 12. The equation for the speed of an object in circular orbit is $v_t = \sqrt{\frac{Gm}{r}}$. What does *m* represent in this equation? * The mass of the central object 13. A satellite in a high orbit around Earth is redirected to a lower orbit closer to Earth's surface. Which statement describes the changes in energy and motion in order for the satellite to remain in this new, lower orbit? Choose the correct answer. * The satellite's potential energy will increase while the speed and kinetic energy will decrease. 14. When you flip a switch to turn on a light, the delay time before the light turns on is determined by * the drift speed of the electrons in the wire. 15. Why can the energy stored in a battery be considered electrical energy? * The energy is stored in chemical bonds.